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ft INTERLABORATORY PROGRAMS

iliili F0R RUBBER

A 11104 Sl3fl00

ANALYSES NO. 37

JULY SEPTEMBER 1978

U. S. DEPARTMENT OF COMMERCE

NATIONAL BUREAU OF STANDARDS
NBS COLLABORATIVE REFERENCE PROGRAMS

TAPPI Paper and Board (6 times per year)

Bursting strength

Tearing strength

Tensile breaking strength

Elongation to break

Tensile energy absorption

Folding endurance

Stiffness

Air resistance

Grammage

Smoothness

Surface pick strength

K & N ink absorption

pH

Opacity

Blue reflectance (brightness)

Specular gloss, 75°

Thickness

Concora (flat crush)

Ring crush

FKBG-API Containerboard (48 times per year)

Mullen burst of linerboard

Concora test of medium

MCCA Color and Appearance (4 times per year)

Gloss at 60°

Color and color difference

Retroreflectivity

Rubber (4 times per year)

Tensile strength, ultimate elongation and tensile stress

Hardness

Mooney viscosity

Vulcanization properties

ASTM Textiles (3 times per year)

Flammability (FF3-71 and FF5-74)

ASTM Cement (2 times per year)

Chemical (11 chemical components)

Physical (8 characteristics)

AASHTO Bituminous

Asphalt cement (2 times per year)

Cutbacks (once a year)

ie«

Collaborative Reference Programs

B360 Polymer Building

National Bureau of Standards

Washington, D.C. 20234

Rev, 4/77
•' * " rmtm «f SEP 1 UT4

CiDb hu - lUP

INTERLABORATORY PROGRAMS Q djio 0

FOR RUBBER usu

Analyses No. 37

July - September 1978

J. Horlick

Office of Testing Laboratory Evaluation Technology

Office of Engineering Standards

National Engineering Laboratory

T. L. Cummings, Research Associate,

Collaborative Testing Services, Inc.

G. W. Bullman

Polymers Science and Standards Division

Center for Materials Research

National Measurement Laboratory

U. S. DEPARTMENT OF COMMERCE

\ \ \ National Bureau of Standards

NBSIR 79-1365
:

I

I
INTRODUCTION

This report summarizes the test results for the second quarter of 1978.

The tests cover the four areas in the NBS Collaborative Reference

Programs for Rubber: Tensile Properties, Hardness, Mooney Viscosity,

and Vulcanization Properties.

For each of the four areas, there is a set of summary tables followed

by a table of data and analysis by laboratory and a graphical presentation of the data and analysis. Where applicable, the tables of data have

the English and Metric expressions side-by-side. Additional details are given in the section "Key to Tables and Graphs."

If there are questions or comments on the notes, the analyses, or the

reports in general, contact Jeffrey Horlick (301) 921-2946.

Jeffrey Horlick, Administrator

NBS Collaborative Reference Programs

Office of Testing Laboratory Evaluation Technology

May 24, 1979
Si
TABLE OF CONTENTS

Page

Introduction

Table of Contents 1

Key to Tables and Graphs 2

Program 1: Tensile strength, ultimate elongation

and stress at 300% elongation 5

Program 2: Hardness 13

Program 4: Mooney Viscosity 17

Program 5: Vulcanization characteristics determined

with oscillating-disk cure meter 21

1
KEY TO TABLES AND GRAPHS

LAB CODE

F

X

*

MEAN

% DEV

REL SDR

VAR CODE

GR MEAN

SD MEANS

Confidential laboratory identification number known only

to the participant and the Collaborative Reference Program

staff

.

A flag identifying results that are extreme in comparison

with the other results.

- The plotted point for the indicated laboratory lies

outside of the 99% error ellipse (not shown); ie,

assuming normal distribution, 99% of laboratories

similar to those participating in the program will

be represented by points lying within the 99% ellipse.

- The plotted point for the indicated laboratory lies

outside of the 95% error ellipse shown on graphs, but

inside the 99% ellipse.

The arithmetic average of the two median values for the two

sheets or samples of the same material.

The deviation or difference of the laboratory MEAN from the

GR. MEAN (see below) , expressed as a percent of the

GR. MEAN.

The ratio of the SDR (standard deviation of replicate measurements within a laboratory) to the AVER SDR (see below) . Extreme values, ie, values that are likely to occur by chance

less than one time in a hundred as determined by the chisquare test, are marked with an "X".

A code number designating a particular test instrument, set

of environmental conditons, procedure, unit used, or other

variation. The code "01" designates the instrument, conditions

and procedure specified at the top of the page either explicitly

or in the cited ASTM Standard, and the unit of test shown at the

top of the first column of data. A '+' in front of the VAR CODE

indicates that the data has been excluded from the grand means

due to a non-standard variation of the possibilities mentioned

above, or the data is extreme.

The arithmetic average (grand mean) of all the laboratory MEAN

values, excluding those flagged (F) with an "X".

The standard deviation among the laboratory MEAN values included in the GR. MEAN.

2
AVER SDR The arithmetic average of all the standard deviations of

within laboratory replication, excluding those excluded

from the GR. MEAN and excluding any additional ones for

which the REL SDR has been flagged.

GRAPH

For each laboratory the MEAN for the second material is plotted against

the MEAN for the first material, with each point representing a laboratory. The horizontal and vertical lines are the GR. MEAN values. The

dashed line is drawn at 45°. The solid sloping line, which may or may

not lie close to the 45° line, is the major axis of the ellipse. The

ellipse is drawn so that, on the average, it will include 95% of the

points representing the laboratories. The plotted symbols X and * used to

represent results falling outside the ellipse are explained under "FM above. Laboratories inside the ellipse (no flag in the F column) are plotted as an 0.

The graph is plotted with an ellipse when there are 20 or more laboratories

in the analysis. When there are 10 through 19 laboratories in the analysis,

the graph is plotted but the ellipse is omitted. When there are fewer

than 10 laboratories retained in the Grand Mean the graph is not plotted.

For development of the theory, see the paper by J. Mandel and T.W. Lashof,

Interpretation and Generalization of Youden's Two-Sample Diagram, J. of

Quality Technology, Vol. 6, pp 22-36, Jan. 1974.

SUMMARY OF ANALYSES

LABS INCL Number of laboratories included in the GR. MEANs,

LABS OMIT Number of laboratories reporting data but excluded from

the GR. MEANS*

STANDARD DEVIATIONS

LABS Same as the SD MEANS (see above)

SHEETS Standard deviation between the two sheets or samples of the same material.

REPL Same as AVER SDR (see above)

PRECISION OF METHODS

REPL CRP The number of replicate measurements per sheet or sample,

as specified in the Collaborative Reference Program.

REPL ASTM The number of replicate measurements specified for a test

result in the designated ASTM Standard.

3
REPEAT The repeatability, a measure of the within laboratory precision,

i.e., of the ability of the test technician to repeat his test

result: two test results obtained by the same technician on

the same homogeneous sample of material may be expected 95% of

the time to agree within the repeatability.

REPROD The reproducibility, a measure of the between laboratory precision: two test results obtained in different laboratories

may be expected 95% of the time to agree within the reproducibility .

ABSOLUTE Values of REPEAT and REPROD expressed in the units of measurement

PERCENT Values of REPEAT and REPROD expressed as a percent of the GR.

MEANS.

4
REPORT 37 1 INTBRLABORATORY PROGRAM ON EVALUATION OF RUBBER

JULY 1978

TENSILE STRENGTH, ULTIMATE ELONGATION, AND STRESS AT 300% ELONGATION

NOTES

Material C81 and C82 were sheets of the same vulcanized rubber. Similarly, materials C83 and C84 were alike.

V100 results were obtained at NBS using a pendulum tester.

All participants used Die C in ASTM D412 with the following exceptions:

V0070 used ASTM Die B V0122, V0178 and V0208 did not specify a Die V0126 used Die 2 in BS903

V0213 and V0225 used ASTM Die D

Electronic testers were used by 44 (66%) of the 67 participants;

pendulum testers were used by 20 participants; 3 participants did not

specify either type. Elongation measurements were made by automatic

devices by 24 (36%) participants and manually by the rest. There were

24 (36%) reported relative humidities above 55% and 14 (21%) reported

relative humidities below 45%. Seven participants (10%) did not report

the relative humidity used.

SUMMARY OF ANALYSES

LABS LABS STD DEVIATIONS

PROPERTY MATERIAL INCL OMIT GR# MEAN LABS SHEETS REPL UNITS

TENSILE C81-C82 61 4 2658. 92. 6 2. 71. POUNDS PER SQUARE INCH STRENGTH C83-C84 6 1 4 2679. 67. 68. 72. POUNDS PER SQUARE INCH TENSILE C81-C82 61 4 18.33 .63 .A3 .49 MEGAPASCALS

STRENGTH C63-C84 61 4 18.47 .60 .47 .49 MEGAPASCALS

ULTIMATE C81-C82 62 3 626. 20. 9. 15. PERCENT ELONGATION C83-C84 62 3 615. 20. 11. 15. PERCENT

STRESS AT C81-C82 60 5 1115. 66. 24. 26. POUNDS PER SQUARE INCH 300% ELONGATION C83-C84 60 5 1137. 65. 32. 25. POUNDS PER SQUARE INCH STRESS AT C0 1 -C82 60 5 7.688 .454 . 167 .179 MEGAPASCALS

300% ELONGATION C83-C84 60 5 7.844 .447 .221 . 174 MEGAPASCALS

INTERLABORATORY PROGRAM ON EVALUATION OF RUBBER

REPORT 37-1 JULY 1978 PRECISION OF METHODS

REPL REPL ABSOLUTE PERCENT

PROPERTY MATERIAL CRP ASTM GR. MEAN REPEAT REPR6D UNITS REPEAT REPR0D

TENSILE C81-C82 5 5 2658. 195. 254. PSI 7.4 9.6 STRENGTH C83-C84 5 5 2679. 198. 242. PSI 7.4 9.0 TENSILE C61-C82 5 5 1 8.33 1.35 1.75 MEGAPA 7.4 9.6 STRENGTH C83-C84 5 5 18.47 1.37 1.67 MEGAPA 7.4 9.0

ULTIMATE C81-C82 5 5 626. 43. 55. % 6. 8 8. 8 ELONGATION C83-C84 5 5 615. 41. 54. % 6.7 8.8

STRESS AT C8 1-C82 5 5 1 115. 72. 182. PSI 6.4 16.3 300% ELONGATION C83-C84 5 5 1137. 70. 180. PSI 6. 1 15. 8 STRESS AT C81-C82 5 5 7.688 .496 1.257 MEGAPA 6.4 16.3 300% ELONGATION C83-C84 5 5 7. 844 .481 1.238 MEGAPA 6. 1 15. 8

5
JULY 1978 INTERLAB08AT0RY PROGRAM ON EVALUATION OF RUBBER

REPORT 37-1 TENSILE STRENGTH - POUNDS PER SQUARE INCH MATERIAL C81-C82 MATERIAL C83-C84 COMMERCIAL TIRE TREAD SBR LAB MEAN MEAN * REL MEAN MEAN * REL VAR CODE F PSI MEGAPA DEV SDR PSI MEGAPA DEV SDR C0DE INSTRUMENT, UNIT. OR OTHER VARIATION

VO 066 2665* 18.38 .3 .98 2675. 16.45 -. 1 .98 01 V0067 2632* 18. 16 -.9 .36 2640. 18.21 -1.4 .59 01

VO 069 2717. 18.74 2.3 1.19 26 60® 18.34 -.7 1.24 0 1 VO 0 70 2582. 17.8 1 -2.8 1.54 2723. 18.78 1.7 1.60 0 1 V0071 2614. 18.03 - 1.6 1.32 2598® 17.92 -3.0 1.20 0 1 V0072 2730. 18.83 2.7 1.23 2730. 18.83 1.9 1.48 01 V0073 2725. 18.79 2.5 .65 2687. 18.53 .3 .91 01 V0076 2645. 18.24 -.5 1.37 2610. 1 8.00 -2.6 2.08X 01

VO 0 78 2489. 17.17 -6.3 1.29 2551. 17.60 -4.8 .75 01

VO 0 81 2725. 18.79 2.5 1.19 2800. 19.31 4.5 1.22 01

VO 0 83 2537. 17.50 -A. 5 .67 2555. 17.62 -4.6 .34 01

VO 0 84 2615. 18.03 -1.6 .98 2725. 18.79 1.7 1.31 0 1 VO 0 85 2676. 18.45 .7 2. 19X 2727. 1 8. 80 1.8 .74 20 ORIGINAL IN MEGANEWTONS PER SO. METER

VO 0 87 2525. 17.41 -5. 0 2.99X 2620. 1 8.07 -2.2 .94 0 1 V0088 2563. 17.68 -3.6 .98 2661. 18.35 -.7 .92 01 V0092 X 2330. 16.07 -12.3 .39 2365. 16.31 -11.7 .53 0 1 VO 095 2715. 18.72 2.2 .77 27 25. 18.79 1.7 .81 0 1 VO 096 2563. 17.68 -3. 5 1.02 2547. 17.57 -4.9 2.99X 01

V01 00 26 55. 18.31 “ O 1 1.14 2730. 18.83 1.9 .67 01

VOi 02 2505. 17. 28 -5.7 1.61 2545. 17.55 -5.0 1.01 0 1

VO 1 1

1

2590. 17. 86 -2.5 1.56 2685. 18.52 .2 .54 01

VO l 17 2705. 18.66 1.8 .74 2657. 18.33 -. 8 .60 0 1 VO 120 2696. 18.59 1.4 .67 2697. 18.60 .7 .75 01 VO 122 2550. 17.59 -4. 0 .93 2 577. 17.78 -3.8 1.37 01

VOI 23 2720. 18.76 2.3 .74 2770. 19. 10 3.4 .54 01

VO I 26 2756. 19.00 3.7 .47 2756. 19.00 2.9 .98 20 ORIGINAL IN MEGANEWTONS PER SQ. METER

VO 128 2670. 18.41 .5 .71 2645. 18.24 -1.3 1.52 01

VOI 41 2734. 18.86 2.9 .87 2805. 19.35 4.7 .94 01

VO 144 2785. 19.2 1 4. 8 .87 2725. 1 8.79 1.7 .85 01

VO 1 44 B 2800. 19.31 5.4 .88 2865. 19.76 6.9 .69 0 1

VO 146 263 2. 18. 16 -.9 1.09 2670. 18.41 -.3 .90 01

VO 150 2517. 17.36 -5.3 .51 2512. 17.33 -6.2 .46 0 1 VO 152 * 2795. 19.28 5.2 .65 2660. 18.34 -.7 1.57 01

VO 153 2532. 17.46 -4.7 .43 2513. 17.33 -6.2 1. 86 0 1 VO 154 2750. 18.97 3. 5 .89 2765. 19.07 3.2 1.00 0 1

VO 156 26 55. 1 8.3 1 -. 1 1.40 2740. 18.90 2.3 .59 0 1 VO 158 2502. 17.25 -5. 9 1 .25 2589. 17.85 -3.4 .51 20 ORIGINAL IN MEGANEWTONS PER SO. METER

VO 160 2640. 1 8. 20 -.7 1.14 2567. 17.70 -4.2 .83 20 ORIGINAL IN MEGANEWTONS PER SO. METER

VO 166 2706. 18.66 1. 8 .99 2696. 1 8.59 .6 1. 29 0 1 VO 168 2ei5. 19. 4 1 5.9 1.05 2775. 19. 14 3.6 1.07 0 1

VO 169 2654. 16.30 -. 1 .98 2589. 17. 85 -3.4 .91 20 ORIGINAL IN MEGANEWTONS PER SO. METER

VO 176 2570. 17.72 -3.3 .66 2590. 17.86 -3.3 .85 01

VO 177 2680. 18.48 .8 1.32 2705. 18.66 1.0 1.75 01

VO 178 X 2640. 18.21 -.7 1.84 2200. 15. 17 -17.9 2.29X 0 1 VOI 84 2728. 18. 82 2.7 .81 26 59. 18.34 -.7 .94 01

VO 190 2600. 17.93 -2.2 1.03 2683. 18.51 .2 1.33 0 1 VO 199 2860. 19.72 7.6 1 .00 2830. 19. 52 5. 6 1.07 01 V0200 2759. 19.03 3.8 .85 2 844. 19.62 6.2 .82 0 1 V0206 2760. 19.03 3.9 1.20 2850. 19.66 6.4 1. 18 0 1 VO 2 07 2595. 17.90 -2.4 .42 2585. 17.83 -3.5 1.36 0 1 V0208 2719. 18.75 2.3 1.14 2748. 1 8.95 2.6 1.01 20 ORIGINAL IN MEGANEWTONS PER SO. METER

V02 13 2690. 18.55 1.2 .57 2651. l 8.29 -1.0 .74 0 1 V02 14 2582. 17. 80 -2.9 .36 2661. 18.35 -.6 .71 20 ORIGINAL IN MEGANEWTONS PER SQ. METER

V0220 2750. 18.97 3. 5 1.07 2762. 19.05 3. 1 1.21 01

VO 2 23 2590. 17.86 -2. 5 1.70 27 15. 1 8.72 1.3 .84 0 1

VO 224 2680. 18.48 .8 1.74 2650. 18.28 -1. 1 1.90 01

VO 2 25 2504. 17.27 -5.8 2.33X 2514. 17.34 -6. 1 .88 01

VO 2 33 2576. 17.77 -3. 1 1.50 2638. 18.19 -1.5 .72 0 1 VO 2 35 X 2182. 15.05 -17.9 1.79 2109. 14.54 -21.3 . 80 0 1 V0238 2745. 18.93 3.3 .91 2735. 18.86 2. 1 .86 01

VO 2 43 2557. 17.63 -3. 8 1 .64 2700. 18.62 . 8 1.31 0 1 VO 244 2574. 17.75 -3. 1 .62 2610. 1 8.00 -2.6 . 83 21 ORIGINAL IN KILOGRAMS/SQ. CENTIMETER

V0245A 2716. 18.73 2.2 1.17 2717. 18.74 1.4 1.46 0 1 V0245B X 4075. 28.10 53.3 1.28 40 1 1. 27.66 4 9. 7 1.40 01 V0250 2787. 19.22 4.9 1.16 27 87. 19.22 4. 1 .73 01

2658. 18.33 - GR. MEAN - 2679. l 8.47 5 TEST DETERMINATIONS

92. .6 3 - SD MEANS - 87. .60 61 LABORATORIES IN GRAND MEANS

71. • 49 - AVER SDR - 72. .49 65 LAB0RAT0RIES REPORTING

PSI MEGAPA • UNIT PSI MEGAPA

6
3050

3000

2950

2900

2850

2800

2750

2700

2650

2600

2550

2500

2450

2400

2350

TENSILE STRENGTH

IAL C81-C82 2658. PSI MATERIAL C83-C84 2679. PSI

MATERIAL C81-C82

7
INTERLABORATORY PROGRAM ON EVALUATION OF RUBBER

REPORT 37 - l ULTIMATE ELONGATION - PERCENT JULY 1978 MATERIAL C8

1

-C82 MATERIAL C83— C84 COMMERCIAL TIRE TREAD SBR

LAB MEAN * REL MEAN % REL VAR C6DE F % DEV SDR % DEV SDR CODE INSTRUMENT. UNIT, OR OTHER VARIATION

VO 066 640* 2.2 Ull 620. .8 1. 10 01

VO 067 605. -3.3 • 38 580. -5.7 .32 01

VO 069 640. 2.2 1. 15 625. 1.6 1.22 01 V0070 642. 2.6 • 89 610. -.8 .77 01

VO 07

1

602. -3.7 1 « 37 590. -4.1 1.30 01 V0072 640. 2.2 • 78 625 . 1.6 1. 70 01

VO 073 640. 2.2 • 50 625. 1.6 1.16 01

VO 076 610. -2.5 1.47 595. -3.3 2. 26X 01 V0078 X 565. -9.7 1*12 545. -11.4 1.34 01 V0081 625. -. 1 1.05 615. -.0 1.43 01

VO 0 83 615. -1.7 • 75 602. -2. 1 . 82 0 1 VC 0 84 605. -3.3 1.12 610. -.8 1.08 01

VO 0 85 655. 4.6 2® 42X 640. 4.0 1.02 0 1 VO 0 87 604. -3.4 3.36X 601. -2.2 1.44 01 V0088 6 12. -2. 1 1.02 637. 3.6 1.02 01 V0C92 * 575. -8. 1 • 82 575 • -6.5 .65 01

VO 095 615. -1.7 1.06 595* -3.3 .98 0 1 VO 0 96 * 587. -6. 1 1.00 565. -8. 1 2. 15X 0 1 VO 100 640. 2.2 1.34 630. 2.4 .77 01

V01 02 625. -. 1 1.63 630. 2.4 . 86 01

VO 1 1 1 645. 3.1 2.09X 64 1« 4.2 1.00 01

VO 1 17 645. 3.0 • 50 620. .8 .97 01

VO 120 625. -. 1 • 60 615. -.0 .73 0 1 VO 122 665. 6.2 1 • 28 640. 4.0 1.65 01

VO 123 630. .6 • 69 640. 4.0 .46 0 1

VO 126 643. 2.8 • 91 638. 3. 8 .78 0 1 VO 128 640. 2.2 • 66 615. -.0 1.63 0 1 VO 1 4

1

640. 2.2 1.44 635. 3.2 .84 0 1 VO 144 630. .6 1.98X 61 0. -.8 1.06 0 1 VO l 44B 620. -.9 1.84 620. .8 .83 0 1

VO 146 632. 1.0 • 96 637. 3.6 1.41 0 1 VO 1 50 595. -4.9 • 56 590. -4. 1 .74 0 1 VO 1 52 640. 2.2 • 81 600. -2.5 1. 56 01

VO 153 645. 3.0 • 29 615. -.0 1. 39 01 V01 54 635. 1.4 • 66 615. -.0 .99 01

VO 156 590. -5.7 1.82 575. —6. 5 .63 01

VO 156 625, -. 1 1.5 1 632. 2.8 1. 14 0 1 VO 160 630. .6 1.57 605. -1.6 .62 01

VO 166 615. -1.7 .50 615. -.0 . 88 0 1 VO 168 630. .6 .44 620. .8 .48 0 1

VO 169 640. 2.2 • 64 615. -.0 . 86 01

VO 1 76 605. -3.3 • 79 605. -1.6 1.08 01

VO 1 77 * 630. .6 1 • 20 655. 6.5 .58 01

VO 178 X 6 26. .0 1.97X 515. -16.2 2. SOX 01

VO 1 84 640. 2.2 • 81 600. -2.5 .82 0 1

VO 190 635. 1.4 1.13 600. -2.5 1.52 01 VO 199 625. -.1 1.78 644. 4.7 1.18 01 V0200 640. 2. 2 .65 630. 2.4 . 72 0 1 V02 06 610. -2.5 .83 605. -1.6 .81 0 1 V02 07 600. -4. 1 .00 600. -2.5 1.08 01 V0208 600. -4. 1 1.04 600. -2.5 1.60 01 V0213 634. 1.4 .66 607. -1.3 . 80 0 1 V02 14 635. 1.4 .42 620. . 8 .69 0 1 V0220 625. -. 1 1.25 625. 1.6 .77 01 V0223 605. -3.3 1.22 615. -.0 1.29 01

VO 2 24 632. 1.0 1.92 620. .8 1.67 01 V0225 595. -4.9 1.23 585. -4.9 .73 01 V0233 600. -4. 1 .93 605. -1.6 .69 01 V0235 X 500. -20. 1 1.51 480. -22.0 .58 0 1 V0238 630. o 6 • 84 620. .8 1.05 01 V0243 620. -.9 1.69 625. 1.6 . 99 0 1 VO 2 44 6 20. -.9 .75 590. -4. 1 .67 01 V0245A 655. 4.6 .67 625. 1.6 1.07 01 V0245B 66 5. 6.2 • 77 645. 4.9 .89 0 1 V02 50 665. 6.2 1.32 650. 5.7 l.oo 01

626. - GR . MEAN - 615. 5 TEST DETERMINATIONS

20. - SB MEANS - 20. 62 LABORATORIES IN GRAND MEANS

15. - AVER SDR - 15. 65 LABORATORIES REPORTING

% UNIT %

8
690

680

670

660

650

640

630

620 '

6 10

600 -

590

580 -

570 -

560 -

550 -

540

ULTIMATE EL0NGAT ION

560 570 580 590 600 610 620 630 640 650 660 670 680 690 700

MATERIAL C81-C82

a
REPORT 37 1 INTERLABORATORY PROGRAM ON EVALUATION OF RUBBER

STRESS AT 300% ELONGATION - POUNDS PER SQUARE INCH JULY 1978 MATERIAL C81-C82 MATERIAL C83-C84

COMMERCIAL TIRE TREAD SBR LAB MEAN MEAN * REL MEAN MEAN % REL VAR C^DE F PSI MEGAPA DEV SDR PSI MEGAPA DEV SDR CODE INSTRUMENT, UNIT, OR OTHER VARIATION

VO 066 1 035® 7. 138 -7.2 1.28 1 1 10. 7.655 -2. 4 1. 89 01

VO 067 1215. 8.379 9.0 .60 1238. 8.538 8. 8 .54 0 1 VO 069 X 558. 3.852 -49.9 .62 560. 3. 862 -SO. 8 .68 01

VO 070 1027. 7. 083 -7.9 1.13 1 1 54. 7.959 l.S 1.29 0 1 VO 07 1 1 134. 7.82 1 1.7 2.22X 1167. 8. 052 2.7 1. 17 01

VO 0 72 1085. 7.483 -2.7 1.21 1130. 7.793 -.6 .80 01

VO 0 73 1157. 7.983 3.S 1.11 1125. 7.759 -1. 1 .74 01

VO 076 1165. 8.034 4.5 .87 1 145. 7.897 .7 .93 01

VO 078 * 1189. 8.203 6.7 2.42X 1290. 8.897 13.4 1.79 01

V00 81 1 1 12. 7.672 -.2 .48 1187. 8. 190 4.4 .54 01

VO 0 83 1150. 7.931 3.2 1.03 1135. 7. 828 -.2 1.24 01

VO 0 84 1105. 7.62 1 -.9 .96 1150. 7.931 1. 1 .54 01

VO 0 85 1081. 7.452 -3. 1 .48 1 139. 7. 852 . 1 .84 20 ORIGINAL IN MEGANEWTONS PER SQ. METER

V00 87 1135. 7. 828 1.8 1.15 1 1 85. 8. 172 4.2 .74 01 V0088 1022. 7.052 -8.3 1.97X 1059. 7.303 -6.9 1.82 01 V0092 1085. 7. 483 -2.7 .99 1065. 7. 345 -6.4 1.33 01

VO 095 1125. 7.759 .9 1.21 1175. 8. 103 3. 3 .54 01

VO 096 1196. 8.248 7.3 .55 1228. 8. 469 8. 0 7.79X 01

VOi 00 * 1010. 6. 966 -9.4 1.13 1 140. 7. 862 .2 .98 01

VO 1 02 * 930. 6.414 -16.6 .76 955. 6. 586 1 'O • 0 .91 01

VO 1 i 1 1045. 7.207 -6. 3 .94 1 1 10. 7.655 -2.4 .84 01

VOI 17 1120. 7.724 .S 1.02 1132. 7. 810 -.4 1.09 01

VO 1 20 1 164. 8.031 4.5 .97 1170. 8. 072 2.9 .91 01

VO 122 X 885. 6. 103 -20.6 .93 902. 6.224 -20.6 .49 0 1 VOI 23 1180. 8. 138 5.9 .41 1135. 7. 828 -.2 .90 0 1

VO 126 1099. 7.582 -1.4 1.03 1099. 7. 582 -3.3 .73 20 ORIGINAL IN MEGANEWTONS PER SQ. METER

VO 128 1085. 7.483 -2.7 .65 1 1 15. 7.690 -2.0 .63 0 1 VO 14 1 1114. 7.683 -. 1 1.23 1 148. 7. 921 1.0 1.02 0 1 VO 144 1C90. 7.517 -2.2 .73 1070. 7.379 -5.9 1.03 0 1 VO 144B 1165. 8.034 4.5 1.39 1 175. 8. 103 3.3 .78 01

VO 146 1100. 7.586 -1.3 1.44 1061. 7.317 -6.7 1.30 01

VO 15C 1C 90 . 7.517 -2.2 .59 1075. 7.414 -5.5 .60 01

VO 152 1140. 7. 862 2.3 .62 1 1 55. 7.966 1.6 .63 01

VOI 53 •» 950. 6. 552 -14. 8 1.28 974. 6.721 -14.3 1.50 01

VOI 54 1180. 8. 138 S. 9 .93 1 165. 8.034 2.4 .32 0 1

VOI 56 * 1285. 8. 862 15.3 2.47X 1320. 9. 103 16.1 .97 01

VO 1 58 1044. 7.202 -6.3 1.84 10 88. 7.502 -4.4 1. 39 20 ORIGINAL IN MEGANEWTONS PER SQ. METER

VO 1 60 1 153. 7.952 3.4 .57 1 139. 7. 852 . 1 1.57 20 ORIGINAL IN MEGANEWTONS PER SQ. METER

VO 166 1155. 7.969 3.7 .46 1 1 15. 7.693 -1.9 .87 01

VO 168 1149. 7.928 3. 1 1.04 1124. 7.752 -1.2 .39 01

VO 169 1052. 7.252 -5.7 .90 1088. 7.502 -4.4 1.31 20 ORIGINAL IN MEGANEWTONS PER SQ. METER

VO l 76 1165. 8.034 4.5 1.93 1 1 80. 8. 136 3.7 1.24 0 1 VOI 77 1075. 7.414 -3. 6 1.30 1 065. 7.345 -6.4 .93 0 1 VOI 78 1070. 7.379 -4. 0 .42 1 125. 7. 759 -1.1 1.02 01 VOI 84 1180. 8. 138 5.9 1.05 1 140. 7. 862 .2 1.01 0 1

VO 190 1100. 7.586 -1.3 .79 1 144. 7. 890 .6 1.09 0 1 VO 199 X 1320. 9. 103 1 8. 4 3.84X 1210. 8. 345 6.4 2.95X 0 1 V0200 1109. 7.652 -.5 .71 1 128. 7.779 -.8 .68 01 V0206 1155. 7.966 3.6 1. 19 1255. 8.655 10.3 1. 16 0 1 V02 07 1195. 8.241 7.2 1 .36 1 1 55. 7. 966 1.6 2. COX 01 V0208 1211. 8.352 8.6 1.36 1240. 8. 552 9.0 1. 40 20 ORIGINAL IN MEGANEWTONS PER SQ. METER

V02 13 1131. 7. 803 1.5 1.68 1138. 7.848 . 1 1. 12 01 V02 14 108 1. 7. 452 -3. 1 .66 1175. 8. 102 3.3 1.36 20 ORIGINAL IN MEGANEWTONS PER SQ. METER

V0220 107 5. 7.414 -3.6 .46 1075. 7.414 -5.5 .90 0 1 VO 2 23 1 150. 7.931 3.2 .88 1 132. 7. 810 -.4 .75 01

VO 2 24 X 1425. 9. 828 27.8 1.29 1 162. 8.017 2.2 1.49 01 V0225 1175. 8. 103 5.4 .97 1 163. 8. 024 2.3 .99 01

VO 2 33 1140. 7. 866 2.3 1.42 1 161. 8. 010 2. 1 .83 0 1 V0235 1212. 8.359 8.7 .95 1203. 8.297 5.8 .63 01 V0238 1100. 7. 586 -1.3 1.07 1 1 05. 7.621 -2.8 .92 0 1

VO 243 1038. 7. 159 -6.9 1.26 1 076. 7.424 -5.4 1.22 01

VO 2 44 « 1060. 7.308 -4.9 1.03 1202. 8.289 5.7 1. 15 21 ORIGINAL IN KILOGRAMS/SQ• CENTIMETER

V0245A 1016. 7.010 -8. 8 1.87 1015. 7.000 -10.8 1.49 01 V0245B X 1522. 10.497 36.5 .98 1507. 10. 397 32.5 1.45 01 V0250 1125. 7.759 . 9 .68 1125. 7.759 -1. 1 .69 01

1115. 7.6ee - OH. MEAN - 1 137. 7.844 5 TEST DETERMINATIONS

66. .454 • SD MEANS * 65. .447 60 LABORATORIES IN GRAND MEANS

26. • 179 • AVER SDR - 25. • 174 65 LABORATORIES REPORTING

PSI MEGAPA - UNIT PSI MEGAPA

10
MATERIAL

C83-C84

STRESS AT 3007. ELONGATION

MATERIAL C81-C82 1115. PSI MATERIAL C83-C84 1137. PSI

11
1
REPORT 37 2 INTER LABORATORY PROGRAM ON EVALUATION OF RUBBER

JULY 1970

HARDNESS

NOTES

Materials C81 and C82 were sheets of the same vulcanized rubber. Similarly, materials C83 and C84 were alike.

V100 results were obtained at NBS using ASTM D2240.

Five of the 33 participants reporting used ASTM D1415 (Wallace)

for the hardness determination. One participant did not report

the instrument used. All others used ASTM D2240 (Type A Durometer).

SUMMARY OF ANALYSES

LABS LABS PROPERTY MATERIAL INCL OMIT

HARDNESS C81-C82 32 a C83-C84 32 a

STD DEVIATIONS

GR. MEAN LABS SHEETS REPL UNITS

57.07 1.90 .23 .42 IRHD

57.31 1.77 .13 .51 IRHD

REPORT 37-2

INTERLABORATORY PROGRAM ON EVALUATION OF RUBBER PRECISION OF METHODS JULY 1970

PROPERTY MATERIAL

REPL CRPREPL ASTM GR. MEAN HARDNESS C8I-C82 5 5 57.07 C83-Ce4 5 5 57.31

ABSOLUTE PERCENT REPEAT REPROD UNITS REPEAT REPROD

1. 17 5.48 IRHD 2.0 9,6

1.42 4.91 IRHD 2.5 8«6

13
INTERLABORATORY PROGRAM ON EVALUATION OF RUBBER

REPORT 37-2 HARDNESS - IRHD JULY 1978 MATERIAL C8

1

— C82 MATERIAL C83—C84 COMMERCIAL TIRE TREAD SBR LAB MEAN % REL MEAN % REL VAR C0DE F I PHD DEV SDR IRHD DEV SDR CODE INSTRUMENT. UNIT. OR OTHER VARIATION

V0069 57# 25 .3 .84 57.75 .8 1.30 01

VO 070 « 61# 50 7.8 2.29X 60.00 4.7 1.23 01

VO 07

1

59# 00 3.4 .00 59.00 3.0 .00 01 V0072 60# 00 5. 1 1.88 60.50 5.6 2.79X 01 V0078 56© 50 -1.0 1.18 57.0 0 -.5 1.07 01 VOC 81 56.50 -1.0 1.30 57.00 -.5 1.41 01

VOC 84 57.00 -. 1 .00 57.00 -.5 .97 0 1 VC085 56.70 -.6 .62 56.60 -1.2 .56 01 V0087 60.50 6.0 .00 60.50 5.6 .00 01 V0088 56.00 -1.9 1.98X 57.0 0 -.5 1.07 01 V0092 56.00 -1.9 1.06 57.00 -.5 1.07 01 VC095 57.00 -. 1 .53 57.00 -.5 .00 01

VO 100 55.25 -3.2 .65 55.25 -3.6 .53 01

VO 102 60.00 5. 1 .99 60.00 4.7 1.73 01

VO 1 1 1 58. 00 1.6 .53 58. 00 1.2 .97 0 1

VO 122 56.00 -1.9 .53 56.50 -1.4 .49 01

VO 128 * 52.00 -8.9 1.64 54.00 -5.8 1.25 01 VO 141 X 50.50 -11.5 1.49 49.50 -13.6 .97 01

VO 144 59.00 3.4 .65 59.50 3.8 .44 0 1 V0144B 59.50 4.3 1.30 60.00 4.7 1.41 01

VO 168 58. 25 3. 1 .74 58.25 1.6 1.02 01

VO 169 55.00 -3. 6 .53 5 5. 0 0 -4.0 .44 01

VO 176 56. 00 - 1.9 1.49 56. 00 -2.3 .97 0 1 VO 190 57.50 .8 .65 59. 00 3. 0 .97 01 V0200 55.25 -3.2 .75 5 5. 4 0 -3.3 1.06 01 V0206 58.50 2.5 1. 18 5 8.00 1.2 • 53 01 V0208 55. 50 -2.8 1.90 55.50 -3.2 1.55 01 V02 14 56.55 -.9 2.70X 56.9 0 -.7 1.81 01 V0224 55.00 -3.6 1.06 56. 00 -2.3 .69 01 V0233 57.50 .8 1.18 57. 5 0 .3 1.41 01

VO 2 35 55.00 -3.6 1.30 54.75 -4.5 .49 0 1 V0243 56.50 -1.0 .53 56.00 -2.3 .44 0 1 VO 2 44 56.00 -1.9 .99 56.00 -2.3 1. 13 0 1 57.07 - GR . MEAN - 57.31 5 TEST DETERMINATIONS

1.98 - SD MEANS - 1.77 32 LABORATORIES IN GRAND MEANS

• 42 - AVEB SDH - .51 33 LABORATORIES REPORTING

I PHD - UNIT IRHD

14
MATERIAL

C83-C84

HRRDNESS

MATERIAL C81-C82 57.07 I RHO MATERIAL C83-C84 57 .31 IRHD

15

REPORT 37 4 INTERLABORAT 6RY PROGRAM ON EVALUATION OF RUBBER AUGUST 1978

MOONEY VISCOSTIY

NOTES

Materials T31 and T82 were the same rubber. Similarly, materials

T83 and T84 were the same rubber. No sample preparation was required

for materials T81 and T82 whereas, mill massing was required for materials T83 and T84.

V100 results were obtained at NBS on the manually closed viscometer

used for determining the Mooney viscosities of the standard rubbers.

SUMMARY OF ANALYSES

LABS LABS PROPERTY MATERIAL INCL OMIT

MOONEY T81 -T82 42 3 VISCOSITY T83-T84 42 3

STD DEVIATIONS

GR a MEAN LABS SHEETS REPL UNITS

67.52 1.69 .14 .38 ML 62.63 2.38 .42 .41 ML

REPORT 37-4

I NTFRLABORATORY PROGRAM ON EVALUATION OF RUBBER PRECISION OF METHODS AUGUST 1978

PROPERTY MATERIAL

REPL CRP REPL

ASTM GR. MEAN MOONEY T81 -T82 3 3 67.52 VISCOSITY T83-T84 3 3 62.63

ABSOLUTE PERCENT REPEAT RBPP6D UNITS REPEAT REPR0D

1.05 4.69 ML 1.6 6.9

1.13 6. 61 ML 1.8 10.5

17
REPORT 37 INTERLABOBATORY PROGRAM ON EVALUATION OF RUBBER

MOONEY VISCOSITY - ML AUGUST 1978 MATERIAL T8 1- T82 MATERIAL T83-T84 BUTYL RUBBER SBR LAB MEAN % BEL MEAN % REL VAR CADE F ML DEV SDR ML DEV SDR CODE INSTRUMENT, UNIT, OR OTHER VARIATION

V0068 67# 50 -.0 .76 66.50 6.2 5.50X 01

V0071 X 67# 00 -.8 .53 53.00 -15.4 .35 01 V0072 * 64# 50 -4.5 2.29 56.50 -9.8 1.41 01

VO 073 66# 25 -1.9 1.58 60.25 -3.8 .85 01

VO 077 66# 60 -1.4 .81 59.40 -5.2 .98 01 V0078 X 62# 35 -7.7 1.93 53.00 -15.4 3.02X 01

VO 0 80 67. 80 .4 1.22 66.00 5.4 1.48 01 V0083 70.15 3.9 1.04 64.40 2.8 1. 19 01 V0085 70.25 4.0 1.32 63.50 1.4 1.22 01 V0090 68# 10 .9 .58 60.50 -3.4 .00 01 V0092 68# 00 .7 1.53 6 5.50 4.6 .00 01 V0095 65.00 -3.7 1.77 58.75 -6.2 1.54 01

V01 00 68.40 1.3 .75 62.75 .2 .35 01

VO 1 I i X 59.30 -12.2 1.56 54.45 -13.1 .40 01

VOl 17 69.00 2.2 1.67 63.50 1.4 1.97 01

VO 122 66.50 -1.5 .66 63.75 1*8 .96 01

VO 128 69.25 2.6 .76 67.25 7.4 .35 01

VO 144 67.75 .3 1.27 62.50 -.2 1.22 01

VO 146 66.75 -1. 1 1 . 04 61.50 -1.8 .61 01

VO 148 67. 00 -.8 1.53 60.50 -3.4 2.63X 0 1

VO 1 49 68.35 1.2 1.23 62.85 .4 .24 01 VOl 50 65.00 -3.7 1.44 60.55 -3.3 .63 01

VOl 56 67. 12 -.6 1.23 63.8 7 2.0 1.40 01

VO 166 67.00 -.8 .76 66. 00 5.4 .70 01

VO 169 67.50 -.0 .76 62. 00 -1.0 .49 01

VO 177 66.05 -2.2 .61 64. 10 2.4 1.02 01

VO 178 67.00 -.8 .15 62.90 .4 . 28 01

VO 1 82 70.50 4.4 1.04 63.50 1.4 .96 01

VOl 90 68.95 2.1 .26 61.65 -1.6 .31 01

VO 206 65.50 -3.0 .76 59.00 -5.8 .70 0 1

VO 207 69.45 2.9 .58 63.25 1.0 .49 01 V0208 67.00 -.8 .76 59.50 -5.0 1.41 01

VO 2 1

1

67.50 -.0 .76 66.75 6.6 .00 01

VO 2 13 64.00 -5.2 .38 60.25 -3.8 1.06 01

VO 214 65.25 -3.4 .76 63.50 1.4 1. 57 01

VO 2 17 66.00 -2.2 .76 62. 00 -1.0 1.57 01 V0218 70.25 4.0 .38 64.25 2.6 .00 01 V0220 69.00 2.2 .76 63. 85 2.0 1.25 01 V0223 68.50 1.5 .76 64.50 3.0 .96 01 V0230 67.20 -.5 2.30 59.45 -5.1 .65 01

VC 2 36 71.00 5.2 1.53 63.00 .6 1.41 01 V0238 67.00 -.8 .36 61.00 -2.6 3.27X 01 V0244 66.50 -1.5 2.85X 64. 00 2.2 4.65X 01 V0250 69.00 2.2 .00 63.50 1.4 1.41 01 V0251 66.35 -1.7 1.01 62. 1 0 -.8 1. 34 01

67. 52 - GR. MEAN - 62.63 3 TEST DETERMINATIONS

1.69 • SD MEANS - 2.38 42 LABORATORIES IN GRAND MEANS

.38 - AVER SDR - .41 45 LABORATORIES REPORTING

ML - UNIT ML

18
MATERIAL

T83-T84

M00NEY VISCOSITY

MATERIAL T8I-T82 67-52 ML MATERIAL T83-T84 62-63 ML

19

REPORT 37 5 INTERLABORATORY PROGRAM ON EVALUATION OF RUBBER SEPTEMBER 1978

VULCANIZATION CHARACTERISTICS USING OSCILLATING DISK CURE METER

NOTES

Materials Y81 and Y82 were the same rubber formulation. Similarly, materials Y83 and Y84 were alike.

V100 results were obtained at NBS using a model TM-100 Monsanto

Rheometer with a disk oscillating at +1° amplitude and 1.7 hertz

frequency.

One participant used a Monsanto Rheometer operated at 10° Amplitude

and 1.7 hertz frequency. All others used Monsanto Rheometers

operated at one degree amplitude and 1.7 hertz frequency.

SUMMARY OF ANALYSES

LABS LABS STD DEVIATIflNS PROPERTY MATERIAL INCL OMIT GR. MEAN LABS SHEETS RE PL UNITS

SCORCH Y81 -Y62 40 0 3.24 .27 .02 .07 MINUTES

TIME Y83-Y84 40 0 4.43 .34 .02 .06 MINUTES

CURE TIME Y8I -Y82 39 X 7.32 .49 .03 .o-r MINUTBS

( 50% MH ) Y83-Y84 39 X 6.34 .43 .02 .07 MINUTES

CURE TIME Y81 -Y 82 39 X 15.18 .93 .07 .11 MINUTBS

( 90% MH ) Y83-Y84 39 X 9.37 .64 .05 .12 MINUTES

MINIMUM Y8X -Y82 36 4 6.47 .47 .03 .07 POUND- INCHES

TORCUE Y83-Y64 36 4 4.39 .37 .04 .07 POUND -INCHES

MINIMUM Y81 -Y62 36 4 .7311 .0534 .0035 .0083 NEWTON- METERS

TORQUE Y83-Y84 36 4 .4957 .0423 .004 7 .0077 NEWTON-METERS

MAXIMUM Y8X -Y82 38 2 29.60 1.02 .08 .10 POUND- INCHES

TORQUE Y83-Y84 38 2 21.72 .89 .06 .11 POUND- INCHES MAXIMUM Y8X -Y82 38 2 3. 3442 .1156 .0087 .0115 NEWTON -METERS T0RQUB Y83-Y84 38 2 2.4537 . 1 0C3 .0067 .0121 NEWTON- METERS

PRECISION 0F METHODS

REPL REPL ABSOLUTE PERCENT

PROPERTY MATERIAL CRP ASTM GR. MEAN REPEAT RBPRSD UNITS REPEAT REPR0D

SCORCH Y8X -Y82 3 3 3.24 .20 .75 MINUTE 6.1 23.0

TIME Y83-Y84 3 3 4.43 .18 .94 MINUTE 4.0 21.2

CURE TIME Y8X -Y82 3 3 7.32 .21 1.34 MINUTE 2.8 18.4

( 50% MH ) Y83-Y84 3 3 6.34 .20 1.19 MINUTE 3.2 18.8

CURE TIME Y8X -Y82 3 3 15.18 .31 2.59 MINUTE 2.0 17.1

( 90% MH ) Y83-Y84 3 3 9.37 .34 1.77 MINUTE 3.6 18.9

MINIMUM Y8X -Y82 3 3 6.47 .20 1 . 31 LB-IN, 3.1 20.

TORQUE Y83-Y84 3 3 4.39 .19 1 .04 LB-IN, 4.3 23.6 MINIMUM Y8X -Y82 3 3 .7311 .0229 .1479 N-M 3.1 20.2 TORQUE Y83-Y84 3 3 .4957 .0212 .1172 N-M 4.3 23.6

MAXIMUM Y81 -Y 82 3 3 29.60 .28 2.83 LB-IN, 1.0 9.6 TORQUE Y83-Y84 3 3 21.72 .30 2.46 LB-IN, 1.4 11.3 MAXIMUM Y8X -Y82 3 3 3.3442 .0318 .3202 N-M 1.0 9.6 TORQUE Y83-Y84 3 3 2. 4537 .0335 .2777 N-M 1.4 11.3

21
INTEHLAB6RAT0RY PROGRAM ON EVALUATION OF RUBBER

REPORT 37 - 5 SCORCH TIME - MINUTES SEPTEMBER 1978 MATERIAL YSl - Y 82 MATERIAL Y83-Y84

COMMERCIAL TIRE TREAD SBR

LAB MEAN % REL MEAN % REL VAR CODE F MINUTE DEV SDR MINUTE DEV SDR CODE INSTRUMENT, UNIT, OR OTHER VARIATION

VO 07

1

3. 25 .3 .40 4.40 -.7 .91 01 V0074A 3.27 1.1 .75 4.30 -2.9 .00 01 VC074B 3.57 10.3 2.13 4.83 9. 1 1. 40 01

VO 077 3.45 6.5 1.58 4.57 3.3 .23 01 V0078 3.75 15.7 .50 5. 19 17. 1 1.35 01 V0075 3.00 -7.4 .00 4.25 -4.0 .00 01 V00 83 3.60 11.1 1.10 4.90 10.6 .91 01

VO 0 85 2.75 -IS. 1 .00 3.75 -15.3 .23 01

VO 0 86 3.40 4.9 .81 4.75 7.3 .00 01 V0090 3.59 10.8 .83 4.70 6.1 .73 0 1 V0092 3. 17 -2.0 .55 4. 1 0 -7.4 1.36 01 V0095 3. 40 4.9 .00 4.65 5.0 .00 01

V01 00 3.25 .3 1.21 4.65 5.0 .91 01

VO I 17 3.30 1.8 .81 4.4 0 -.7 1.57 01

VO 120 3.00 -7.4 .81 4. 10 -7.4 2. 11 01

VO 122 2. 85 -12.1 1.10 3.95 -10.8 3.62X 01

V01 28 3. 10 -4.3 .00 4.35 -1.8 1. 24 01 VO 144 3.42 5.7 .63 4.70 6. 1 .68 01

V01 46 3. 37 4. 1 2.02 4. 87 10. 1 2.27 01

V01 49 3.10 -4.3 .08 4.40 -.7 .68 0 1

VO 150 3.55 9.5 .88 4.50 1.6 .00 01

V01 52 3.35 3.4 .40 4.55 2.7 .45 01

V01 54 3.20 -1.3 .53 4.20 -5.2 .23 01

V01 56 3.55 9.5 1.86 4.72 6.7 .91 01

V01 58 2.92 -9.7 .93 4*01 -9.5 .36 01

VO 161 3.00 -7.4 .40 4.20 -5.2 .45 01

VO 166 3.05 -5.9 1.21 4.10 -7.4 2. 48X 01

VO 169 3.05 -5.9 1.21 3.95 -10.8 1.81 01

VO 178 3.60 tl.l .81 4.80 8.4 1. 36 01

VO 182 3.05 -5.9 1.80 4.02 -9.1 1.40 01

VO 190 2.78 -14.2 3.S5X 4.02 -9. 1 .48 01

VO 2 07 3.50 6.0 1.10 4. 85 9.5 1.36 01 V02 08 2.83 -12.5 .6 1 4. 26 -3.8 3.22X 01 V02 1 1 3.15 -2.8 2.04 4.27 -3.5 .23 01 V0213 3.00 -7.4 1.01 4. 12 -6.9 1.96 01 V0217 3.50 8.0 .00 4.90 10.6 .00 01 V0220 3. 10 -4.3 .40 4.30 -2.9 .00 01 V0221 3.50 8. 0 1.77 4.60 3.9 1.57 01 V0238 3.50 8.0 .40 4. 80 8.4 .23 01

VO 2 43 2.83 -12.7 1.31 4.14 -6.5 .64 01 3.24 • OR. MEAN - 4.4 3 3 TEST DETERMINATIONS

.27 • SD MEANS - .34 40 LABORATORIES IN GRAND MEANS

.07 • AVER SDR - .06 40 LABORATORIES REPORTING

MINUTE - UNIT MINUTE

22
MATERIAL

Y83-Y84

SCORCH TIME

MATERIAL Y81-Y82 3.24 MINUTE MATERIAL Y83-Y84 4.43 MINUTE

23
INTERLABORATORY PROGRAM ON EVALUATION OF RUBBER

REPORT 37 - S CURE TIME (50* MH > - MINUTES SEPTEMBER 1978 MATERIAL Y81-Y82 MATERIAL Y83-Y84 COMMERCIAL TIRE TREAD SBR

LAB MEAN « REL MEAN % REL VAR CODE F MINUTE DEV SDR MINUTE DEV SDR CODE INSTRUMENT. UNIT, OR OTHER VARIATION

V007I 7.40 1. 1 .77 6« 25 -1.5 .79 0 1 V0C74A 7.55 3. 1 1.02 6® 35 . 1 .40 01 V0074B 7.80 6.5 2.47X 6.99 10.2 1.76 01

VO 077 7.67 4.8 1.98 6.55 3.3 .20 01 V0078 7.87 7.5 .97 6.81 7.4 1.98 01 V0079 7.32 .0 .00 6.27 -1. 1 .00 01 V00Q3 8.20 12.0 1.06 7. 15 12.7 1.45 01 V0085 6. 45 -1 1.9 .19 5.6 5 -10.9 .40 01

VO 0 86 X 8. 10 10.6 .77 6. 05 -4.6 1.45 0 1 V0090 7.81 6.7 .97 6.66 5.1 .77 01 V0092 7.07 -3.4 .97 5. 85 -7.8 .54 0 1 VO 095 7.50 2.4 .00 6.60 4.1 .00 01

VO 100 7.60 3. 8 1.55 6.45 1.7 1.48 01

V0 1 17 7. 15 -2.4 1.78 6.2 0 -2.2 1.83 01

VO 1 20 6.65 -9.2 1. 06 5.90 -7.0 1. 59 01

VO 122 7.05 -3.7 .39 5.95 -6.2 1.59 01

VO 128 6.70 -8.5 .77 5.80 -8.5 1. e4 0 1 VO 1 44 7.60 3.9 1.24 6.85 8.0 .40 01

VO 146 7.62 4. 1 1.94 6.75 6.4 1.98 01

VO l 49 7.22 -1.3 .53 6.42 1.3 .59 01

VO 1 50 7.00 -4.4 3.67X 6.00 -5.4 .00 0 1 VO 152 7.55 3. 1 .39 6.60 4. 1 .40 01

V01 54 7.05 -3.7 .39 6. 10 -3. 8 .20 01

VOl 56 7.70 5.2 .58 6.72 6. 0 .92 01

VO 158 6.62 -5.5 .72 5.75 -9.3 .72 01

VO 161 6.90 -5. 8 1.06 6.00 -5.4 .40 0 1 VO 166 7.05 -3.7 1.16 5.90 -7.0 2.42X 01

VO 169 7.10 -3.0 1.45 5.90 -7.0 1.59 01

VO 178 8. 10 1 0.6 1.06 6.95 9.6 1.48 01

VO 1 82 6.92 -5.4 1.55 5.75 -9.3 1.59 01

VO 190 7.67 4.8 1.41 6.63 4.5 .22 01 VO 2 07 8.40 14.7 1.41 7.05 1 1.2 .79 01 V02 08 7.09 -3. 1 .73 6.29 -.8 .38 01 V02 1 l 7. 12 -2.7 1.16 6.35 . 1 .00 01 V02 13 6.77 -7.5 .39 6.12 -3.4 2.71X 01

VO 2 1

7

7.55 3.1 1.06 6.80 7.2 .79 01 V0220 7.05 -3.7 1.06 6. 05 -4.6 .40 0 1 V02 21 7. 10 -3.0 4.90X 6. 10 -3. 8 1.84 01 V0238 8.10 10.6 .39 7.00 1 0.4 .79 01 V0243 6.43 -12. 1 .84 5. 8 0 -8.5 .92 01

7. 32 • GR . MEAN • 6. 34 3 TEST DETERMINATIONS

• 49 - SD MEANS - .43 39 LABORATORIES IN GRAND MEANS

• 07 • AVER SDR -• 07 40 LABORATORIES REPORTING

MINUTE - UNIT MINUTE

24
MATERIAL

Y83-Y84

CURE TIME (50*/ MH

)

MATERIAL Y81-Y82 7.32 MINUTE MATERIAL Y83-Y84 6.34 MINUTE

25
INTERLABORATORY PROGRAM ON EVALUATION OF RUBBER

REPORT 37-5 CURE TIME (90* MH ) - MINUTES SEPTEMBER 1978 MATERIAL Y81-Y82 MATERIAL Y83-Y84 COMMERCIAL TIRE TREAD SBR LAB MEAN « REL MEAN « REL VAR C6DE F MINUTE DEV SDR MINUTE DEV SDR CODE INSTRUMENT. UNIT. OR OTHER VARIATION

VO 07 1 15.45 1.8 1.14 9.35 -.2 .64 01 V0C74A 15.85 4.4 .60 9.55 1.9 .40 0 1 V0074B 16« 25 7. 1 3.97X 10.38 10.8 2.22 01 VO 077 15.32 1.0 1.08 9.67 3.2 .35 01 V0078 15.94 5.0 .97 10. 12 8.0 2.11 01 V0079 X 17.75 17.0 .00 9.50 1.4 .00 0 1 VO 0 83 16.50 8.7 4.69X 10.40 11.0 1.24 01

VO 0 65 13.25 -12.7 .81 8.32 -11.2 1.19 0 1 VO 0 86 15.80 4. 1 .52 9.95 6.2 .00 01 V0090 16. 05 5.8 1.76 9.71 3.7 1.18 0 1

VO 0 92 14. 85 -2.2 .52 8.60 -8.2 .40 01

VO 095 15.00 -1.2 .00 9. 25 -1.3 .00 0 1 VO 100 15.25 • S 1.23 9.45 .8 .47 01

V01 17 14.55 -4.1 3.67X 9.3 0 -.6 1.69 01

V01 20 13.40 -11.7 4. 5 1 X 8.85 -5.6 7.04X 01

VO 122 15.95 5. 1 .95 9.00 -4.0 1.04 01

VO 128 13.75 -9.4 1.30 8.50 -9.3 .47 0 1 VO 144 15.37 1.3 1.31 9.93 6.0 .06 01

V01 46 15.75 3.8 3.02X 10. 12 8. 0 2.77X 01

V01 49 15.45 1.8 .39 9.57 2.2 .70 0 1

VO 1 50 14.95 -1.5 2.28 8.87 -5.3 1.60 01

VO 152 15.35 1.1 .52 9.6 5 3.0 .47 0 1 V01 54 14.67 -3.3 .39 9.27 -1.0 .32 01

V01 56 15.70 3.4 1.18 9.75 4.0 1.12 0 1 VOi 58 14. 07 -7.3 1.17 8.40 -10.4 .66 01

VO 16 1 14.75 -2.8 1.16 8.95 -4.5 .64 01

VO 166 14.20 -6.4 .52 8.50 -9.3 1.24 01 VO 169 14.90 -1.8 1.04 8.75 -6.6 1.09 01

VO 178 16.75 10.4 .95 10. 15 8.3 1.32 01

VO 1 82 14.22 -6.3 1.12 8. 4 0 - 1 0.4 1.23 01

VO 190 16.62 9.5 3.74X 9.98 6.5 . 11 01 V02 07 16.55 9.0 .95 10.35 1 0.4 1.09 01 V0208 14.07 -7.3 4. 03X 9.29 -.8 1.97 01 V02 1 1 15.25 .5 .65 9.35 -.2 .23 01 V02 13 14.15 -6. 8 1.82 8.87 -5.3 1.29 01 V02 17 15.05 -.8 1.39 9.90 5.6 .81 0 1 V0220 15.80 4. 1 2.58X 9.15 -2.4 1.72 01 V0221 15. C5 -.8 4.22X 8.65 -7.7 1.64 01 V02 38 16.50 8.7 .91 10.50 12.0 1. 17 01 V0243 13.54 -10.8 .39 8.7 1 -7. 1 1.13 0 1

15. 18 - GR. MEAN - 9.37 3 TEST DETERMINATIONS

.93 - SD MEANS • .64 39 LABORATORIES IN GRAND MEANS

• 1 1 - AVER SDR -• 12 40 LABORATORIES REPORTING

MINUTE - UNIT MINUTE

26
MATERIAL

Y83-Y84

CURE TIME (907. MH

)

MATERIAL Y81-Y82 15.18 MINUTE MATERIAL Y83-Y84 9.37 MINUTE

MATERIAL Y81-Y82

27
INTERLABORAT 0RY PR0GRAM ON EVALUATION OF RUBBER

REPORT 37-5 MINIMUM TORQUE - POUND-INCHES SEPTEMBER 1978 MATERIAL Y81-Y82 MATERIAL Y83-Y84 COMMERCIAL TIRE TREAD SBR

LAB MEAN MEAN % REL MEAN MEAN % REL VAR CODE F LB-IN. N-M DEV SDR LB-IN. N-M DEV SDR 'CODE INSTRUMENT, UNIT, OR OTHER VARIATION

V0071 6.22 .7034 -3.8 .99 4.20 .474€> -4.3 .85 01 VO 0 74

A

6.90 .7796 6.6 .87 5.02 .5678 14, 5 .78 01 V0074B 6.27 .7090 -3. 0 .54 4.15 .4689 -5.4 . 80 0 1 VO 077 6.67 .7542 3.2 1.77 4.30 .4859 -2.0 . 85 01 V0078 7.05 .7966 9.0 1.08 4.95 .5 593 12.8 2. 13X 0 1 V0079 5.75 .6497 -1 1. I .00 3.60 .4068 -17.9 .00 01 V00 83 6. 75 .7627 4.3 .79 4.70 .5311 7. 1 .00 01

VO 0 85 6. 73 .760 0 4.0 .00 4.51 . 5100 2.9 .00 40 ORIGINAL IN NEWTON-METER

V0086 6. 25 .706 2 -3.4 .40 4.30 .4859 -2.0 .85 01 V0090 6.40 .7231 - 1. 1 2. 14 4.27 .4830 -2.6 2.08X 0 1

VO092 6.40 .7231 -1.1 .40 4.35 .4915 -. 8 .85 01

VO 0 95 6.05 .6836 -6.5 .00 4.35 . 4915 -. 8 .00 01

VO 100 5.95 .6723 -8.0 1.19 4.00 .4 520 -8. 8 .00 0 1 V01 17 7.35 . 8305 13.6 .68 5.00 .5649 14. 0 .43 01 VO 120 * 6.05 .6836 -6.5 4.35X 4.70 . 5311 7. 1 4.20X 01

VO 122 7.30 . 824 6 12. 8 1.19 4.85 .5480 10.6 1.59 01

VO 128 X 6.35 .7175 -1.9 .00 5.20 .5875 18.5 .85 01

VO 144 6. 20 .7005 -4.2 .79 4.25 . 4802 -3. 1 1.59 01 VO 146 5.75 .6497 -11.1 3.95X 4.00 .4520 -8. 8 .00 0 1 V01 49 6. 17 .6977 -4.6 .40 4.07 . 4604 -7. 1 .43 01

VO 1 50 7.00 .7909 8.2 1.98 4.67 .5262 6.6 .64 0 1 V01 52 5.90 .6666 -8.8 .00 3.80 .4294 -13.4 .00 01

V01 54 6. 80 .7683 5. 1 .40 4.85 . 5480 10.6 . 85 0 1 V01 56 6. 50 .7344 .5 .79 4.50 . 5085 2.6 1. 16 01

VO 158 * 7.40 .836 1 14. 4 3.52X 4.60 .5198 4.9 .98 0 l

VO 161 5.90 .6666 -8.8 1.19 4.00 .4520 -8. 8 .43 01

VO 166 6.0C .6779 -7.3 .40 3.90 .4407 -11. 1 .00 01

VO 169 6.28 .7100 -2.9 1.52 4.07 . 4600 -7. 2 3. 05X 40 ORIGINAL IN NEWTON-METER

VO 178 6.30 .711 8 -2.6 .79 4.20 .4746 -4.3 1.28 0 1 VO 182 6. 55 .7401 1. 2 1.48 4.45 . 5028 1.4 1. 28 0 1

VO 190 X 13. 90 1 .57C6 99.9 10.09X 9. 35 1.C565 99.9 . 85 01 V0207 6.70 .7570 3.5 .00 4.70 • 5311 7.1 1.16 Cl V0208 6.33 .7152 -2.2 .75 4.37 . 4943 -.3 1. 58 0 1 V02 1 1 6. 40 .7231 -1. 1 1.24 4.00 . 4520 -8. 8 .00 01 V0213 7.55 .8531 16.7 .79 5. 12 .5791 16.8 .00 0 1 V0217 6.0C .6779 -7.3 .00 4.00 .4520 -8. 8 .00 01 V0220 X 7.90 .8926 22. 1 1.08 6.05 .6 836 37.9 .85 01 V0221 X 3.55 • 401 1 -45. 1 1.19 2.30 .2599 -47.6 1.75 01 V0238 6.55 .740 1 1.2 .40 4.50 . 5085 2.6 1.07 0 1 V0243 6.55 .740 1 1.2 2.09 4.60 • 5198 4.9 1. 55 01

6. 47 .7311 - GR. MEAN - 4.39 .4957 3 TEST DETERMINATIONS

• 47 . 0534 - SD MEANS - .37 . 0423 36 LABORATORIES IN GRAND MEANS

.07 . 0083 - AVER SDR -

• 07 . 0077 40 LABORATORIES REPORTING

LB-IN. N-M • UNIT LB- IN. N-M

28
MRTERIRL

Y83-Y84

MINIMUM T0RQUE

MATERIAL Y81-Y82 6.47 LB-IN. MATERIAL Y83-Y84 4.39 LB-IN.

29
REPORT 37 5 INTERLABORATORY PROGRAM ON EVALUATION OF RUBBER MAXIMUM TORQUE - POUND-INCHES SEPTEMBER 1978 MATERIAL Y61-Y82 MATERIAL Y83-Y84 COMMERCIAL TIRE TREAD SBR LAB MEAN MEAN % REL MEAN MEAN % REL VAR CODE F LB— IN# N-M DEV SDR LB- IN. N-M DEV SDR CODE INSTRUMENT, UNIT, OR OTHER VARIATION

V0071 28.90 3.2654 -2.4 .28 21.40 2.41 80 -1.5 .74 01

VO 074 A 30. 30 3.4236 2.4 1.71 22.82 2.5790 5. 1 .55 01 V0074B 29.27 3.3076 -1.1 i.oe 21.59 2.4395 -.6 .95 Ol V0077 29.65 3. 3502 .2 .80 21.97 2. 4830 1.2 .40 0 1 VO 078 29.9 0 3.3784 1.0 .75 22.10 2.4971 1.8 1.08 01 V0079 27.90 3. 1524 -5.7 .00 20.00 2.2598 -7.9 .00 01

VO 0 83 30.75 3.4744 3.9 3.64X 22.75 2.5705 4.8 4.53X 01 V0085 30.00 3.3901 1.4 .50 21.55 2.4351 -. 8 .24 40 ORIGINAL IN NEWTON-METER

VO 0 86 28. 20 3. 1 863 -4.7 1.14 20. 80 2.3502 -4.2 .54 0 1 VO 0 90 28.45 3.2146 -3.9 1.14 21.25 2.4010 -2. 1 1.47 01 V0092 31. 20 3.5366 S. 8 .78 23.75 2. 6835 9.4 .54 01

VO 0 95 27.75 3. 1355 -6.2 .00 20.20 2.2824 -7.0 .00 01

VO 100 30.30 3.4236 2.4 2.73X 21.50 2.4293 -1.0 1.08 01

V01 17 30.40 3.4349 2.7 6.88X 22.00 2.4858 1.3 .54 01 VOl 20 « 28.80 3.2541 -2.7 5.46X 22.55 2.5479 3. 8 3.78X 01

VO 122 30.65 3. 463

1

3.6 1.06 22.55 2.5479 3. 8 2. 16 0 1 VO 128 29.05 3.2624 -1.8 .75 20.75 2.3445 -4.4 .98 01

VOl 44 29.55 3.3389 -.2 1.35 21*95 2.4801 1. 1 .54 01

VOl 46 28.00 3. 1637 -5.4 2.84X 21.00 2.3728 -3.3 „00 0 1 VO 149 29.65 3.3502 .2 .39 21.57 2.4378 -.7 .37 01

VO 150 29. 50 3.3332 -.3 4.93X 20.75 2. 3445 -4.4 2. 85 X 01

VO 1 52 29.10 3.2880 -1.7 .28 21.00 2.3728 -3.3 .00 01

VO 154 30.05 3.3953 1.5 .78 22.90 2.5875 5.5 1.08 01

VOl 56 29. 20 3. 2993 -1.3 .85 21.65 2.4462 -.3 1.89 01

VOl 58 31.35 3.5422 5.9 2.41 22.30 2.5197 2.7 .74 0 1

VO 161 28.00 3. 1637 -5.4 .28 20.20 2.2824 -7.0 1.43 01

VO 166 29.40 3.3219 -.7 .28 20.60 2.3276 -5. 1 1.35 01

VO 169 28.59 3. 230

1

-3.4 .87 21.06 2. 3801 -3.0 1. 13 40 ORIGINAL IN NEWTON-METER

VO 178 28.65 3. 2372 -3.2 .00 21. 10 2.3841 -2.8 .98 0 1 VO 1 82 30.85 3.4857 4.2 .99 22.35 2. 5253 2.9 .81 01

VOl 90 X 64. 50 7.2879 99.9 21.97X 45.75 5. 1693 99. 9 .27 01 V0207 30.95 3. 4970 4.6 .78 22.90 2. 5875 5.5 1.08 01 V0208 31.00 3. 5033 4. 8 2.29 2 3.09 2.6089 6.3 3.78X 0 1 V02 1 l 31. 07 3. 51 1

2

5. 0 2.23 22.50 2.5423 3.6 .27 01 V0213 30. 25 3.4179 2.2 3.88X 22.47 2. 5395 3.5 1. 18 0 1 V0217 29.00 3.2767 -2.0 .CO 21.00 2.3728 -3.3 .00 0 1 V0220 30.30 3.4236 2.4 1.52 2 1.70 2.4519 -. 1 1.79 01 V0221 X 15.60 1.7626 -47. 3 3.86X 1 1 .35 1. 2824 -47.7 .71 0 1 V0238 28. 75 3. 2485 -2.9 .71 21.62 2.4434 -.4 .94 0 1 V0243 29.90 3.3784 1.0 3.4 IX 21.95 2.4801 1. 1 2. 16 0 1 29.60 3.3442 - GR. MEAN - 2 1.72 2.4537 3 TEST DETERMINATIONS

1.02 • 1 156 - SD MEANS - .89 . 1003 38 LABORATORIES IN GRAND MEANS

• 10 .0115 AVER SDR -

. 1 1 • 0121 40 LABORATORIES REPORTING

LB-IN. N-M • UNIT LB- IN. N-M

30
MATERIAL

Y83-Y84

MRXIMUM T0RQUE

MATERIAL Y81-Y82 29.60 LB-IN. MATERIAL Y83-Y84 21.72 LB-IN.

MATERIAL Y81-Y82

31
NBS-1 ; =!A (REV. 9-78)

U.S. DEPT. OF COMM. BIBLIOGRAPHIC DATA

SHEET

1. PUBLICATION OR REPORT NO. RUBBER CRP 373. Recipient's Accession No.

4. TITLE AND SUBTITLE

INTERLABORATORY PROGRAMS FOR RUBBER

Analyses No. 37

July - September 1978

5. Publication Date May 23, 1979

7. AUTHOR(S)

J. Horlick, G. W. Bullman, T. Cummings

8. Performing Organ. Report No. NBSIR 79-1365

9. PERFORMING ORGANIZATION NAME AND ADDRESS kJNoJoct/Task/Work Unit No.

NATIONAL BUREAU OF STANDARDS

DEPARTMENT OF COMMERCE

WASHINGTON, DC 20234

11. Contract/Grant No.

12. SPONSORING ORGANIZATION NAME AND COMPLETE ADDRESS (Street, city. State, ZIP) Collaborative Testing Services, Inc., 9241 Wood Glade Drive,

Great Falls, VA 22066

13. Type of Report & Period Covered FINAL

15. SUPPLEMENTARY NOTES

| | Document describes a computer program; SF-185, FIPS Software Summary, is attached.

16. ABSTRACT (A 200-word or less factual summary of most significant information. If document includes a significant bibliography or

literature survey, mention it here.)

Collaborative Reference Programs provide participating laboratories with the means for checking periodically the level and uniformity of their testing

in comparison with that of other participating laboratories. An important

by-product of the programs is the provision of realistic pictures of the state

of the testing art. This is one of the periodic reports showing averages

for each participant, within and between laboratory variability, and other

information for participants and standards committees.

17. KEY WORDS (six to twelve entries; alphabetical order; capitalize only the first letter of the first key word unless a proper name;

separated by semicolons)

Collaborative reference program; Laboratory evaluation; Precision;

Reference samples; Rubber; Testing calibration.

18. AVAILABILITY Unlimited

[X)j For Official Distribution. Do Not Release to NTIS

I I Order From Sup. of Doc., U.S. Government Printing Office, Washington, DC

20402, SD Stock No. SN003-003-

Order From National Technical Information Service (NTIS), Springfield, VA. 22161

19. SECURITY CLASS

(THIS REPORT)

UNCLASSIFIED

20. SECURITY CLASS

(THIS PAGE)

UNCLASSIFIED

21. NO. OF

PRINTED PAGES

36

22. Price

USCOMM-DC