NBS

PUBLICATIONS

A1110M ^3^510

Collaborative Testing Services, Inc.

i

COLLABORATIVE REFERENCE PROGRAM

FOR RUBBER

ANALYSES NO. 40

APRIL - JUNE 1979

%

U.S. DEPARTMENT OF COMMERCE

National Bureau of Standards
NBS COLLABORATIVE REFERENCE PROGRAMS

TAPP I 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

CTS Rubber (4 times per year)

Tensile strength, ultimate elongation and tensile stress

Hardness

Mooney viscosity

Vulcanization properties

CTS Thermal Insulation Materials (2 times per year)

19 test methods for thermal insulation materials covering:

thermal properties; strength properties; dimensions, stability,

and density properties; fire properties; and properties of

vapor barriers

ASTM Cement (2 times per year)

Chemical (11 chemical components)

Physical (8 characteristics)

AASHTQ Bituminous

Asphalt cement (2 times per year)

Cutbacks (once a year)

NBS Collaborative Reference Programs

AOS Technology Building

National Bureau of Standards

Washington, DC 20234

Rev. 3/79
FEB 2 7

INTERLABORATORY PROGRAMS

FOR RUBBER QC.XOO

UTt,

-i3' IYOS”

t-2—

Analyses No. 40

April - June 1979

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 79-1805

INTRODUCTION

This report summarizes the test results for the second quarter of 1979.

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 at (301) 921-2946.

Jeffrey Horlick, Administrator

NBS Collaborative Reference Programs

Office of Testing Laboratory Evaluation Technology

August 9, 1979
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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 Confidential laboratory identification number known only

to the participant and the Collaborative Reference Program

staff

.

F A flag identifying results that are extreme in comparison

with the other results.

X - 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.

MEAN The arithmetic average of the two median values for the two

sheets or samples of the same material.

% DEV The deviation or difference of the laboratory MEAN from the

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

GR. MEAN.

REL SDR 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".

VAR CODE 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.

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

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

SD MEANS 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 "F"

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
INTERLABORATORY PROGRAM ON EVALUATION OF RUBBER

REPORT 40-1 APRIL 1979

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

NOTES

Materials B91 and B92 were sheets of the same vulcanized rubber. Similarly, materials B93 and B94 were alike.

V100 results were obtained at NBS using a pendulum tester.

All participants used Die C in ASTM D 412 with the following exceptions:

V126 used Die 2 in BS903

V0146 and V208 did not specify a Die V225 used ASTM Die D

INSTRUMENTS RELATIVE HUMIDITY

Number Relative Number

Instrument of Labs Percent Humidity of Labs Percent

Electronic Manual 21 36% Below 45% 14 24% Electronic Automatic 20 35% Above 55% 14 24% Pendulum Manual 15 26% 45% - 55% 19 33% Pendulum Automatic 2 3% Not Specified1 11 19%

58 100% 58 100% SUMMARY OF ANALYSES

LABS LABS STD DEVIATIONS

PROPERTY MATERIAL INCL OMIT GR. MEAN LABS SHEETS REPL UNITS

TENSILE B91-B92 56 2 2480* 82. 51. 53. POUNDS PER SQUARE INCH

STRENGTH B93-B94 56 2 2504* 85. 40. 60. POUNDS PER SQUARE INCH

TENSILE B91-B92 56 2 17. 101 .568 .351 .366 MEGAPASCALS

STRENGTH B93-B94 56 2 17.269 .583 .272 .412 MEGAPASCALS

ULTIMATE B91-B92 54 4 568. 25. 8. 14. PERCENT

ELONGATION B93-B94 54 4 562. 21. 5. IS. PERCENT

STRESS AT B91-B92 55 3 1281. 72. 21. 26. POUNDS PER SQUARE INCH

30 0* ELONGATION B93-B94 55 3 1283. 76. 16. 24. POUNDS PER SQUARE INCH

STRESS AT B91-B92 55 3 8. 835 .495 . 183 • 180 MEGAPASCALS

300% ELONGATION B93-B94 55 3 8.847 .523 • 140 .163 MEGAPASCALS

PROPERTY MATBRIAL

RBPL

CRP

PRECISION OF REPL

ASTM OR. MEAN

METHODS

ABSOLUTE

RBPBAT REPROD UNITS

PERCENT

RBPEAT RBPROD

TBNSILE B91-B92 5 5 2480. 147. 228. PSI 5.9 9.2

STRENGTH B93-B94 5 5 2504. 166. 234. PSI 6.6 9.4

TENSILB B91-B92 5 5 17.101 1.013 1.572 MEGAPA 5.9 9.2

STRBNGTH B93-B94 5 5 17.269 1.142 1.615 MBGAPA 6.6 9.4

ULTIMATE B91-B92 5 5 568. 38. 68. % 6.7 12.0

ELONGATION B93-B94 5 5 562. 41. 59. % 7.2 10.5

STRESS AT B91-B92 5 5 1281. 72. 199. PSI 5.6 15.5

300% ELONGATION B93-B94 5 5 1283. 66. 210. PSI 5. 1 16.4

STRESS AT B91-B92 5 5 8. 835 .498 1.372 MEGAPA 5.6 15.5

300% ELONGATION B93-B94 5 5 8.847 .452 1.449 MEGAPA 5. 1 16.4

5
INTERLABORATORY PROGRAM ON EVALUATION OF RUBBER

REPORT 40 - 1 TENSILE STRENGTH - POUNDS PER SQUARE INCH APRIL 1979 MATERIAL B91-B92 MATERIAL B93-B94 COMMERCIAL TIRE TREAD COMMERCIAL TIRE TREAD

LAB MEAN MEAN * REL MEAN MEAN « REL VAR CODE F PSI MEGAPA DEV SDR PSI MEGAPA DEV SDR CODE INSTRUMENT. UNIT, OR OTHER VARIATION

V0062 2297. 15.845 "7.3 .84 2384. 16.445 -4. 8 1.71 01

VO 063 2504. 17.272 1.0 .89 2545. 17o 552 1.6 .69 01

VO 067 2417c 16.672 -2.5 © 49 2 455. 16. 931 -2.0 .81 0 1 VO 069 2520. 17.379 1.6 1.50 2491. 17o 183 -.5 1.59 0 1 V0071 2442. 16.845 -1. 5 1.06 2445. 1 6o 866 -2.3 1.47 01

VO 072 2670. 18.414 7.7 2.28X 2685. 18o 517 7.2 .94 01

VO 073 2512. 17.328 1.3 .99 2437. 16. 810 -2.7 1. 16 01

VO 076 2570. 17.724 3.6 1.09 2635. 18. 172 5.2 .65 01 V0078 2514. 17.338 1.4 .58 2510. 17.314 .3 .78 01

VO 0 83 2425. 16.724 -2.2 .97 2 392o 1 6o 500 -4.5 .66 0 1

VO 084 254 5. 17.552 2.6 1.57 2565. 17o690 2.4 .32 01

VO 085 2444© 16. e54 -1.4 1. 13 25 02. 17. 254 -O 1 1.39 20 ORIGINAL IN MEGANEWTONS PER SO. METER

VO 0 87 2450. 1 6. 90 0 -1.2 1.73 2480. 17. 103 -1.0 .74 01

VO 0 88 2323. 1 6. 02 1 -6.3 2.28X 2408. 1 6o 6 07 -3.8 1.00 01 V0092 2400. 16.552 -3.2 1.64 2375. 16. 379 -5.2 1.47 01

VO 095 2500. 17.241 .8 1.37 2465. 17.000 -1.6 1.01 01

VO 100 2560. 17.655 3. 2 .98 2 545. 17.552 1.6 .66 01 V01 02 2320. 16. 000 -6.4 1.1 1 2420. 16.690 -3.4 1.14 01

V01 1

1

2515. 17.345 1.4 .81 2550. 17o 586 1.8 .68 01 V01 17 2437. 16.810 -1.7 .63 2437. 16.810 -2.7 .69 01

VO 123 24 35. 16.793 -1.8 .73 2435. 16.793 -2.8 .38 01

VO 126 2596. 17.905 4.7 1.40 2 574. 17o 755 2.8 .74 20 ORIGINAL IN MEGANEWTONS PER SQ. METER

VO 1 28 2510. 17.31

0

1.2 2.30X 2570. 17.724 2.6 .60 01

VO 1 41 2584. 17.824 4.2 .63 2636. 18. 183 5. 3 .89 01

VO 144 2570. 17.724 3.6 .55 2595. 17. 897 30 6 .34 01 V0144B 2525. 17.414 i.e .79 26 20. 18.069 4.6 1.07 01

VO 146 2437. 16. 81

0

-1.7 .97 2542. 17.534 1.5 .53 01

VO 1 49 2490. 17. 172 • 4 1.42 2 548. 17. 576 1.8 1.09 01

VO 150 2437. 16.810 -1.7 .50 2475. 1

7

0 069 -1.2 .89 01

VO 154 2530. 17.448 2. 0 1.12 2615. 18.034 4.4 1.10 01

VO 156 2475. 17.069 -.2 1.21 2510. 17.310 .2 .71 01

VO 158 2495. 17.204 .6 .63 2502, 17. 254 “ o 1 1. 13 72 ORIGINAL IN MEGAPASCAL RECEIVED LATE

VO 160 2422. 16.704 -2.3 .53 2473. 17.054 -1. 2 1.44 20 ORIGINAL IN MEGANEWTONS PER SQ. METER

VO 164 2337. 16.121 -5.7 .46 2372. 16.362 -5.3 .60 01

VO 166 2440. 16. 831 -1.6 1.68 2532. 17.462 1. 1 1.51 01

VO 168 2595. 17.897 4.7 1.81 2637. 18. 186 50 3 .71 01

VO 169 2437. 16.804 -1.7 .85 2487. 17. 154 -.7 .81 20 ORIGINAL IN MEGANEWTONS PER SQ. METER

VO 176 2495. 17. 207 .6 .55 2495. 17.207 -.4 .53 01

VO 184 24 20. 16.690 -2.4 .67 2442. 16. 845 -2.5 .77 01

VO 190 2522. 17.393 1.7 1.09 2500. 17 0 245 -. 1 .99 01

VO 199 2440. 16.828 -1.6 1.05 2465. 17.000 -1.6 .36 0 1 VO 207 2570. 17.724 3.6 .65 25 30. 17. 448 1.0 1,26 0 1 V02 08 2545. 17.555 2.7 .82 2545. 17o 555 1.7 1.52 20 ORIGINAL IN MEGANEWTONS PER SQ. METER

V0213 2503. 17.259 .9 1.06 2 585. 17c 830 3.2 1.07 20 ORIGINAL IN MEGANEWTONS PER SQ. METER

VO 2 1

4

2415. 16. 654 -2.6 .65 2422. 16. 704 -3.3 .90 20 ORIGINAL IN MBOANBWTONS PER SQ. METER

VO 2 20 2587. 17.845 4.3 1.27 2635. 18. 172 5.2 1.69 01 V0223 2500. 17.241 .8 .99 2490. 17. 172 -.6 1.33 01 V0224 2575. 17.759 3.8 1.08 2605. 170 966 4. 0 1.69 01 V0225 2436. 16. 802 -1.8 1.06 2475. 17.069 -1.2 1.17 01

VO 2 32 2392. 16.500 -3.5 .63 2385. 16o 448 -4.8 .55 01 V0233 2447. 16. 879 -1.3 .68 2392. 16.497 -4.5 1.76 01 V0235 2440. 16.831 -1.6 .74 2470. 17.034 -1.4 .64 70 DATA RBCEIVBD LATE

VO 2 38 2370. 16. 345 -4. 4 1. 15 2362. 16. 293 -5.7 1.01 01 V0243 2564. 17.683 3.4 1.72 2607. 17.983 4. 1 1.14 01

VO 2 44 2589. 17. 855 4.4 2. 15X 2596. 17.905 3.7 2. 13X 20 ORIGINAL IN MEGANEWTONS PER SQ. METER

V0245A 2334. 16. 100 -5.9 1.21 2352. 16.221 -6. 1 1.58 01 V0245B 2389. 16.479 -3.6 .69 2418. 16.676 -3.4 1.01 01

VO 2 50 2575. 17.759 3. 8 .95 2570. 17.724 2.6 1.69 01 2480. 17. 101 - GH. MEAN - 2504. 17. 269 5 TEST DETERMINATIONS

82. .568 • SD MEANS - 85. . 583 56 LABORATORIES IN GRAND MEANS

53. .366 - AVER SDR - 60. .412 58 LABORATORIES REPORTING

PSI MEGAPA - UNIT PSI MEGAPA

6
2800

2750

2700

2650

2600

2550

2500

2450

2400

2350

2300

2250

2200

2 :

1ENSILE STRENGTH

1ATER I AL B91-B92 2480. PSI HATER I AL B93-B94 2504. PSI

MATERIAL B91-B92

7
APRIL 1979

I NT ERLAB0RAT0RY PROGRAM ON EVALUATION OF RUBBER

REPORT 40 - 1 ULTIMATE ELONGATION - PERCENT MATERIAL B91-B92 MATERIAL B93-B94 COMMERCIAL TIRE TREAD COMMERCIAL TIRE TREAD

LAB MEAN * EEL MEAN X REL VAR CODE F X DEV SDR X DEV SDR CODE INSTRUMENT. UNIT. OR OTHBR VARIATION

V0062 X 513. -9.7 2. 1 1

X

436. -22.3 .78 01 V0063 590. 3.9 .48 575. 2.3 1.00 01 V0067 550. -3.2 .48 550. -2. 1 .58 01

VO 069 5*5. -.5 1.21 565. .5 . 65 01 V0071 592. 4.2 .97 566. . 8 1. 59 01 V0072 555. -2.3 1.76 550. -2. 1 .61 01 V0073 565. 3.0 .89 565. .5 1.37 01 V0076 565. -.5 .85 570. 1.4 .90 01 V0078 535. -5. 8 .67 525. -6.6 1.37 01

VO 083 557. -1.9 .76 565. .5 .66 01

VO 0 84 555. -2.3 1.40 550. -2. 1 .29 01 V00 85 580. 2. 1 .99 580. 3.2 1.42 01

VO 0 87 547. -3.7 2.04X 574. 2.2 1. 07 01 VO 0 88 533. -6.2 1.29 551. -2.0 1.45 01 V0092 580. 2.1 1.65 570. 1.4 1. 29 01

V0095 600. 5.6 1.87 567. 1.0 1.36 01 VO 100 605. 6.5 .64 585. 4.1 .73 01 VO 102 550. -3.2 1. 16 570. 1.4 .73 01 VOl 11 597. 5.2 1.30 581. 3.4 1. 03 01 V01 17 595. 4.7 .69 565. .5 .73 01

VO 123 560. -1.4 .74 550. -2. 1 . 53 0 1 VO 126 596. 5.0 1.24 591. 5.2 .81 0 1 VO 128 570. .3 1.68 580. 3. 2 .72 01

VO 141 590. 3.9 .68 575. 2.3 .46 01

VO 144 615. 8.3 1.06 60 Oo 6.8 .43 01 V0144B 575. 1.2 .93 570. 1.4 1. 16 01 VO 146 555. -2.3 .85 565. .5 .97 01

VO 149 540. -4.9 1.07 557. -.8 1.31 01 VO 150 530. -6.7 .26 530. -5.7 .92 01

VO 154 545. -4.1 1.00 545. -5. 0 .96 01

VO 156 550. -3.2 .97 565. .5 .70 01

VO 158 555. -2.3 1.56 560. — © 4 1.70 70 DATA RECBIVED LATE

VO 160 580. 2. 1 .50 580. 3.2 1.57 01

VO 164 * 492. -13.3 .78 500. -1 1. 0 . is 01 VO 166 545. -4.1 1.33 550. -2. 1 r,36 01

VO 168 555. -2.3 1.37 555 0 -1.2 .75 01

VO 169 570. .3 .64 575. 2.3 .54 01

VO 176 575. 1.2 .67 560. -.4 .71 01

VO 184 565. -.5 .84 550. -2. 1 1. 49 01

VO 190 600. 5.6 .84 590. 5. 0 1.01 01

VO 199 600. 5.6 2.3 IX 590. 5.0 1.46 01 V0207 550. -3.2 .58 525. -6.6 1.07 01 V0208 * 530. -6.7 .75 505. -10. 1 1.27 01 V0213 553. -2.6 .90 556. -lo 1 .96 01 V0217 565. -.5 .85 565. .5 1.36 01 V0220 552. -2.7 1.49 550. -2. 1 .99 01

VO 2 23 570. .3 .94 560. -.4 1.40 01 V0224 592. 4.3 .95 575. 2.3 2. 0 IX 01 V0225 547. -3.6 1.00 522. -7.0 1.18 0 1 VO 2 32 607. 6.9 .85 590. 5.0 .68 01

VO 233 550. -3.2 1.22 525. -6.6 1. 18 0 1 VO 2 35 576. 1.5 .88 569. 1.3 .71 70 DATA RECEIVED LATB

V0238 565. -.5 .96 555. -1.2 .61 0 1 VO 2 43 575. 1.2 1.49 580. 3.2 1. 04 01 V02 44 580. 2. 1 1.22 580. 3.2 . 86 01

VO 2 45 590. 3.9 1.20 580. 3.2 1. 53 01 V0245B X 560. -1.4 2. 3 1 X 505. -10. 1 1.37 01 V0250 600. 5.6 .93 575. 2.3 .99 01

568. - GR. MEAN - 562. 5 TEST DETERMINATIONS

25. - SD MEANS * 21. 54 LABORATORIES IN GRAND MEANS

14. • AVER SDR - 15. 58 LABORATORIES REPORTING

« - UNIT X

8
MATERIAL

B93-B94

ULTIMATE ELONGATION

MATERIAL B91-B92 568- 7. MATERIAL B93-B94 562. 7.

9
REPORT 40 1 APRIL 1979 INTERLABORATORY PROGRAM 0N EVALUATION 0F RUBBER

STRESS AT 300% ELONGATION - POUNDS PER SQUARE INCH MATERIAL B91-B92 MATERIAL B93-B94 COMMERCIAL TIRE TRBAD COMMERCIAL TIRE TREAD

LAB MEAL MEAN * REL MEAN MEAN % REL VAR CODE F PSI MEGA PA DEV SDR PSI MEGAPA DEV SDR CODE INSTRUMENT. UNIT. OR OTHER VARIATION

VO 062 1383® 9.538 8. 0 1® 13 1383® 9. 54 1 7.8 .72 01

VO 063 1251® 8® 631 -2.3 .64 1282. 6. 845 -c 0 .72 01

VO 067 1247® 8.603 -2.6 .88 1272. 8. 776 -.8 .94 0 1 V0069 126 i. 8® 70 0 -1.5 1.75 1257. 8. 672 -2.0 2. 13X 01

VO 071 1215® 6®383 -5. 1 .72 1250. 8.624 -2.5 .43 0 1 V0O72 1265. 8 0 724 -1.3 1.36 1245. 80 586 -3.0 .90 01 V00 73 1237® 8. 534 -3.4 1. 52 1175. 8. 103 -8.4 1. 18 01

VO 076 1345® 9. 276 5.0 .91 1345. 9. 276 4.8 .54 01

\ - 0 ? 8 1359. 9.372 6. 1 .64 1363. 9.400 6.2 2. 13X 01 V0083 1280® 8.828 -. 1 .91 1200. 8.276 -6. 5 .90 01

VO 0 84 1320, 9. 103 3.0 .80 1305. 9.000 1.7 1.30 01 V0085 1247. 8.602 -2.6 1.04 1247. 8. 602 -2.8 1.91 20 ORIGINAL IN MEGANEWTONS PER SQ. METER

V00P7 13 27. 9. 152 3.6 1.55 1268. 8.745 -1.2 1.90 01 vooes 1295. 8.934 1. 1 1.91 1247. 8.60 0 -2.8 2.73X 01 V0092 1185. 8. 172 -7® 5 .74 1165. 8.034 -9.2 1.56 01

V0095 1227. 8.466 -4.2 1.01 1227. 8.466 -4.3 1. 56 01

VO 100 1210. 8. 34 5 -5® 6 .58 1230. 8.483 -4. 1 1.09 01

VO 102 1195. 8.241 -6.7 1.03 1185. 8o 172 -7.6 1.35 01 V01 11 1225. e.448 -4.4 .56 1255. 8o 655 -2.2 .52 0 1 VO 117 1212. 8. 362 -5.4 1.26 1237. 8.534 -3.5 .51 01

VO 123 1260. 8.690 -1.6 1.09 1290. 8o 897 .6 .75 01 VO 126 1207. 8.327 -5. 8 .90 1203. 8. 297 -6.2 .65 20 ORIGINAL IN MEGANEWTONS PER SQ« METER

VO 128 1280. 8.828 -. 1 .51 1310. 9.034 2. 1 .74 01 VO 141 1329. 9. 166 3.7 .35 1355. 9. 345 5.6 .59 01

VO 144 1210. 8. 345 -5.6 .51 1235. 8.517 -3.7 .60 01 V0144B 1285. 8. 862 .3 .41 1335. 9.207 4. 1 .41 01 VO 146 1242. 8.566 -3. 1 2.04X 1267. 8.741 -1.2 1.21 0 1 VO 149 1344. 9.269 4.9 1.79 1291. 8. 907 .7 1.03 0 1 VO 150 12 87. e.879 .5 .79 13 05. 9o 000 1.7 .62 0 1 VO 154 1365. 9.414 6.5 1.32 1385. 9.552 8. 0 1.03 01

VO 156 1290. 8.897 .7 .88 1270. 8. 759 -1.0 .59 01

VO 158 1334® 9.202 4.2 2. 50X 12 84. 8. 852 o 1 1.97 72 ORIGINAL IN MEGAPASCAL RECEIVED LATE V0160 1269. 8.752 -.9 .73 1276. 8.802 -.5 .66 20 ORIGINAL IN MEGANEWTONS PER SO. METER

VO 164 * 1487® 1 0.259 16. 1 1.27 1490. 10.279 16.2 1. 13 01

VO 166 1306. 9.010 2. 0 1.09 1358. 9 0 366 5.9 1.23 01

VO 168 1358. 9. 369 6. 0 1.48 1336. 9. 214 4. 1 .61 01

VO 169 1240. 8.552 -3.2 .57 1226. 8. 452 -4.5 .38 20 ORIGINAL IN MEGANEWTONS PER SQ, METER

VO 176 1340. 9.241 4.6 .60 1340. 9.241 4.5 1.02 01

V01 84 1282. 8. 845 . 1 1. 18 1285. 8. 862 .2 1.61 01

VO 190 1267. 8.738 -1. 1 .75 1232. 8o 497 -4. 0 1.28 01

VO 199 1252. 8. 638 -2.2 2. 18X 1257. 8.672 -2.0 1.52 01 V0207 1410. 9.724 10. 1 1.46 1415. 9.759 10. 3 1.64 01 V0208 « 1472. 10. 153 14.9 1.63 1458. 1 Oo 053 13.6 2.65X 20 ORIGINAL IN MEGANEWTONS PER SQ. METER

V0213 1324. 9. 13 2 3.4 .74 1323. 9. 127 3.2 1.53 20 ORIGINAL IN MBGANBWT0NS PER SQ. METER

V0214 1327. 9. 152 3.6 . 12 1291. 8. 902 .6 .39 20 ORIGINAL IN MEGANEWTONS PER SQ. METER

V0220 1282. 8. 84 5 . 1 1.10 1310. 9.034 2. 1 .58 01 V0223 1260. 8.690 -1.6 .93 1265. 8.724 -1.4 1.17 01 V0224 * 1325. 9. 138 3.4 1.07 14 07. 9.707 9.7 1.06 01 V0225 1331. 9. 179 3.9 1. 14 1375. 9.483 7.2 2.06X 01

VO 2 32 1152. 7.948 -1 0. 0 .97 1132. 7c 810 -1 1.7 .64 01

VO 2 33 1267. 8®74 1 -1. 1 .86 1278. 8.817 -.3 1. 11 01

VO 2 35 1226. 8.453 -4.3 .27 1250. 8.624 -2.5 .68 70 DATA RECEIVED LATE

V0238 1155® 7. 966 -9.8 .61 1 162. 8.017 -9.4 1.35 01

VO 2 43 1274. 8.786 -.6 .43 1266. So 731 -1.3 .64 01

VO 2 44 1334. 9. 202 4.2 1.39 1301. 8. 972 1.4 2. 1 4 X 20 ORIGINAL IN MEGANEWTONS PER SO. METER

V0245A 1 102. 7.603 -13.9 1.57 1109. 7.648 -13.6 2. 14X 01 V0245B X 1116. 7.70 0 -120 8 3.43X 1317. 9.086 2.7 2.39X 0 1 VO 2 50 1250. 8.621 -2.4 .92 1275. 8.793 -.6 1.19 01

1281. 8.835 * GR. MEAN - 1283. So 847 5 TEST DETERMINATIONS

72. . 495 - SD MEANS - 76. .523 55 LABORATORIES IN GRAND MEANS

26. .180 - AVER SDR - 24. . 163 58 LABORATORIES REPORTING

PSI MEGAFA - UNIT PSI MEGAPA

ID
MRTER

I

RL

B93-B94

STRESS RT 3007. ELONGRT I ON

MATERIAL B91-B92 1281. PSI MATERIAL B93-B94 1283. PSI

11
.

'
REPORT <*0-2

INTERLAB0RATORY PROGRAM ON EVALUATION OF RUBBER

APRIL 1979

HARDNESS

NOTES

Materials B91 and B92 were sheets of the same vulcanized rubber. Similarly, materials B93 and B94 were alike.

V100 results were obtained at NBS using ASTM D1415.

Four of the 28 participants reporting used ASTM D1415 (Wallace)

for the hardness determination. All others used ASTM D2240

(Type A Durometer).

SUMMARY 0F ANALYSES

LABS LABS

PROPERTY MATERIAL INCL OMIT GR« MEAN

HARDNESS B91-B92 26 1 6 lo 45 B93-B94 26 1 61. 27

PRECISION <

REPL REPL PROPERTY MATERIAL CRP ASTM GR. MEAN HARDNESS B91-B92 5 5 61.45

B93-B94 5 5 6 lo 27

STD DEVIATIONS

LABS SHEETS REPL UNITS

1.80 . 19 .41 IRHD

1.98 .18 e 34 IR9D

METHODS ABSOLUTE PERCENT REPEAT REPR0D UNITS REPEAT REPROD

1. 14 4.98 IRHD 1.9 8. 1 .93 5. 50 IRHD 1.5 9.0

13
INTERLABORATORY PROGRAM ON EVALUATION OF RUBBER

REPORT 40 - 2 HARDNESS - IRHD APRIL 1979 MATERIAL B91 -B92 MATERIAL B93-B94 COMMERCIAL TIRE TREAD COMMERCIAL TIRE TREAD

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

V0062 60.25 -2.0 1. 12 59.75 -2.5 2.49X 01 V0069 60.75 -1.1 2. 10X 6 0.25 -1.7 2. 84X 01 V0071 62.50 1.7 1.21 63.00 2.8 1. 48 01

VO 076 * 62.00 .9 .54 59.50 -2.9 1.63 01

VO 084 62. 00 .9 .67 62.00 1.2 .67 01

VO 085 62.30 1.4 1.11 62. 05 1.3 1. 35 01

VO 087 64.50 5.0 1.33 65.00 6. 1 2.38X 01 V0088 58.00 -5.6 .86 57.00 -7.0 2.61X 01

VO 092 62.50 1.7 1.33 62o 5 0 2.0 1. 87 01 V0095 60.00 -2.4 1.33 59o 5 0 -2.9 .67 01

VO 100 60.00 -2.4 .77 60.05 -2.0 .56 0 1 VO 1 02 65.50 6.6 1.33 65.00 6. 1 .82 01 V01 1

62.00 .9 1.09 62.00 1.2 .67 01

VO 128 * 56.50 -8.1 .67 57. 0 0 -7.0 . 00 01

VO 141 60.50 -1.5 .00 60o 00 -2. 1 .82 01

VO 144 62. 00 .9 .67 63.00 2. 8 .00 01

VO 168 63.00 2.5 .84 63.5 0 3.6 .33 01

VO 169 61.00 -.7 .67 61. 00 -.4 . 00 01

VO 176 61.00 -.7 1.88X 61.00 -.4 1.48 01 VO 190 61.50 .1 .67 6 2.50 2.0 .67 01

V02 08 59.85 -2.6 1.84 59.60 -2.7 3. 04X 01 V0214 62.55 i.e .60 620 3 0 1.7 .71 0 1 V0224 62.00 .9 1.68 61. 00 -.4 2. 49X 0 1 V0233 62.00 .9 .00 62.50 2.0 1.48 01 V0235 62.00 .9 .88 61.00 -.4 1. 38 70 DATA RECEIVED LATE

VO 243 61.50 .1 .00 61.00 -.4 .82 0 1 V0244 62.00 .9 .67 61.00 -.4 .00 01 61.45 • GR. MEAN - 61. 27 5 TEST DETERMINATIONS

1.80 • SD MEANS - 1.98 26 LABORATORIES IN GRAND MBANS

.41 - AVER SDR - .34 27 LABORATORIES REPORTING

IRHD * UNIT IRHD

14
MATERIAL

B93-B94

HARDNESS

MATERIAL B91-B92 61.45 IRHO MATERIAL B93-B94 61-27 I RHD

15
•
REPORT 40-4

INTBRLABORATORY PROGRAM ON EVALUATION OF RUBBER

JUNE 1979

MOONEY VISCOSITY

NOTES

Materials S91 and S92 were the same rubber. Similarly, materials

S93 and S94 were the same rubber. No sample preparation was required

for materials S91 and S92 whereas, mill massing was required for materials S93 and S94.

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 STD DEVIATIONS

PROPERTY MATEBIAL INCL OMIT GR. MEAN LABS SHEETS REPL UNITS

MOONEY S91-S92 40 3 67.53 2.00 . 15 .37 ML VISCOSITY S93-S94 40 3 64.60 3.04 .57 .63 ML

PRECISION OF METHODS

REPL REPL ABSOLUTE PERCENT PROPERTY MATERIAL CRP ASTM GR. MEAN REPEAT RBPROD UNITS REPEAT REPROD

MOONEY S91-S92 3 3 67.53 1.03 5. S3 ML 1.5 8.2 VISCOSITY 893-894 3 3 64.60 lo75 8. 42 ML 2.7 13.0

17
REPORT *0 4 INTERLABORATORY PROGRAM ON EVALUATION 0F RUBBER

M00NET VISCOSITY - ML JUNE 1979 MATERIAL S91- S92 MATERIAL S93 -S94 BUTYL RUBBER SBR LAB MEAN * REL MEAN % REL VAR

CODE F ML DEV SDR ML DEV SDR CODE INSTRUMENT, UNIT, 0R 0THBR VARIATION

V0060 67.00 (0 • 1 .39 66. 00 2.2 • 83 01 V0061 66.80 -1.1 .34 66.55 3.0 .36 01 V0068 72.00 6.6 4.93X 69. SO 7.6 2. 00 01

VO 071 68.65 1.7 .54 68.35 5.8 .82 01

VO 072 69.00 2.2 1. 16 64.50 -.2 1.37 01

VO 073 65.00 -3.7 1.55 63.50 -1.7 1.67 01 VO 077 X 66.05 -2.2 1.05 47.80 -26.0 .35 01

VO 076 X 60.00 -11.1 1.55 55.50 -14. 1 1.39 01

VO 079 67. 15 -.6 1.02 64.30 -.s 1.39 01 V0060 67. 00 -.8 1.78 66.55 3.0 1.10 01

VO 083 69.05 2.3 1.32 68.25 5.7 2.01 01 V00 85 72.50 7.4 1.45 70.25 8.8 .46 01 V0090 69.75 3.3 .77 63.75 -1.3 .23 01 V0092 67.00 -.8 1.55 67. 00 3.7 . 00 01 V0095 68.75 1.8 1.06 64.75 .2 1.60 01

VO 100 68.75 1.8 .50 65.25 1.0 .46 01

V01 11 * 63.50 -6. 0 .77 56. 0 0 -13. 3 1.21 01 VO 117 66.25 -1.9 1.55 63. 00 -2.5 1.21 01

VO 128 70.50 4.4 .77 68.50 6.0 1. 58 01

VO 144 68.75 1.8 .92 64.25 -.5 .32 01

VO 146 65.00 -3.7 .39 62.50 -3.2 .00 01

VO 149 68. 65 1.7 .95 65. 45 1.3 .60 01

VO 150 67.50 -.0 .77 6 4. 00 -.9 2. 04 0 1 VO 156 66. 00 -2.3 .39 6 5.75 1.8 .40 0 1 VO 166 66.00 -2.3 .39 64.25 -.5 .92 0 1

VO 177 66.55 -1.4 1.25 67.35 4.3 1 . 26 01 VO 182 67.50 -.0 .77 63.25 - 2. 1 .46 01

VO 190 70.00 3.7 .84 63.90 -1. 1 . 88 01

VO 207 68.90 2.0 .66 62.70 -2.9 .40 01 V0208 67.00 -.8 1.55 60o 50 -6.3 1.58 01

VO 2 13 66.50 -1.5 1.16 63.75 -1.3 .63 01 V0214 67.00 -.8 1.41 65.00 .6 . 85 0 1 V0217 64.00 -5.2 .39 61.75 — 4o 4 .69 01 V0218 68.50 1.4 .77 66.00 2.2 .92 0 1 VO 2 20 65.85 -2.5 .96 64.65 o 1 2. 89X 01 V0221 68.60 1.6 1.07 67.35 4.3 .45 0 1 V0223 66. 00 -2.3 .77 64. 5 0 -.2 .92 0 1 V0230 66.05 - 2.2 .69 58.50 -9.4 .32 01

VO 2 36 69.00 2.2 2. 12 64.50 -.2 2. 00 0 1 V0238 * 64.00 -5.2 2. 12 56.5 0 -12.5 .92 0 1

VO 2 44 66. 00 -2.3 1.55 65. 00 .6 1.83 70 DATA RECEIVED LATE

V0250 68.50 1.4 .77 67.5 0 4.5 .92 0 1 V0251 66.60 -1.4 1.35 64. 00 -.9 1.24 01

67. 53 - OR. MEAN - 64. 60 3 TEST DETERMINATIONS

2.00 • SD MEANS - 3. 04 40 LABORATORIES IN GRAND MEANS

.37 - AVER SDR - .63 43 LABORATORIES REPORTING

ML - UNIT ML

18
76

74

72

70

68

66

64

62

60

58

56

54

52

MOONEY VISCOSITY

58 60 62 64 66 68 70 72 74

MATERIAL S91-S92

76 78 80

13

INTERLABORATORY PROGRAM ON EVALUATION OF RUBBER

REPORT 40-5 JUNE 1979

VULCANIZATION CHARACTERISTICS USING OSCILLATING DISK CURE METER

NOTES

Materials X91 and X92 were the same rubber formulation. Similarly, materials X93 and X9A 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.

All participants used Monsanto Rheometers operated at one degree

amplitude and 1.7 hertz frequency.

Labs V0064 and V0074 reported calculation problems in Cure Time (50% and 90% MH).

SUMMARY OF ANALYSES

LABS LABS STD DEVIATIONS

PROPERTY MATERIAL INCL OMIT GR. MEAN LABS SHEETS REPL UNITS

SCORCH X91-X92 38 3 4.47 .33 .02 .05 MINUTES

TIME X93-X94 38 3 4.55 .33 .02 .05 MINUTES

CURE TIME X91-X92 36 5 6o 42 .35 .02 . 06 MINUTES

( SOS MH ) X93-X94 36 5 6.55 .36 .02 . 06 MINUTES

CURE TIME X91-X92 36 5 10.02 .63 • 04 • 10 MINUTES

( 90S MH) X93-X94 36 5 10. 16 .61 .05 . 10 MINUTES

MINIMUM X91-X92 37 4 5. 18 .67 .03 .07 POUND- INCHES TORQUE X93-X94 37 4 5.27 .65 ,03 . 08 POUND-INCHES

MINIMUM X91-X92 37 4 • 5849 .0759 .0052 .0083 NEWTON- METERS

TORQUE X93-X94 37 4 . 5955 .0737 .004 8 • 0089 NEWTON-METERS

MAXIMUM X91-X92 38 3 23.3 6 1.45 ,05 . 12 POUND- INCHES TORQUE X93-X94 38 3 23.51 1.41 .04 .07 POUND- INCHES MAXIMUM X91-X92 38 3 2.6413 • 1643 •0082 .0132 NEWTON-METERS

TORQUE I93-X94 38 3 2. 6559 • 1595 .0063 .0075 NEWTON- METERS

PROPERTY MATERIAL

REPL CRPREPL ASTM

PRECISION OF

GR. MEAN

METHODS ABSOLUTE

REPEAT REPROD UNITS PERCENT REPEAT REPROD

SCORCH X91-X92 3 3 4.47 .15 .90 MINUTE 3.4 20.2

TIME X93-X94 3 3 4.55 . 14 .91 MINUTE 3. 1 19.9

CURE TIME X91-X92 3 3 6.42 .17 .96 MINUTE 2.6 14.9 (SOS MH) X93-X94 3 3 6.55 . 16 1.00 MINUTE 2.4 15.3

CURE TIME X91-X92 3 3 1 0o 02 .28 1.73 MINUTE 2.8 17.3 (90S MH) X93-X94 3 3 1 0. 16 .27 1.69 MINUTE 2.6 16.7

MINIMUM X91-X92 3 3 5. 18 .20 1.86 LB-IN. 3.9 35.9

TORQUE X93-X94 3 3 5.27 .22 1.81 LB-IN. 4.1 34.3

MINIMUM X91-X92 3 3 . 584 9 .0229 .2102 N-M 3.9 35.9

TORQUE X93-X94 3 3 • 5955 .0247 .2042 N-M 4. 1 34.3

MAXIMUM X91-X92 3 3 23.38 .32 4. 03 LB-IN. 1.4 17.2 TORQUE X93-X94 3 3 23.51 o 18 3.91 LB-IN. .6 16.6 MAXIMUM X91-X92 3 3 2. 64 1 3 . 0366 .4552 N-M 1.4 17.2 TORQUE X93-X94 3 3 2. 6559 .0208 .4419 N-M .8 16.6 21
INTERLABORATORY PROGRAM ON EVALUATION OF RUBBER

REPORT 40-5 SCORCH TIME - MINUTES JUNB 1979 MATERIAL X91-X92 MATERIAL X93-X94 COMMERCIAL TIRE TREAD COMMERCIAL TIRE TREAD

LAB MEAN * REL MEAN « REL VAR

CODE F MINUTE DEV SDR MINUTE DEV SDR CODE INSTRUMENT. UNIT. OR OTHER VARIATION

V0061 4.30 -3.9 .53 4.37 -3.9 1.04 01

VO 064 4.69 4.8 .00 4.77 4.9 . 17 01 V0071 4.25 -5.0 .53 4.25 -6.6 1.12 01 V0074 * 5.50 22.9 2.60X 5.52 21.4 2. SIX 01

VO 078 3.72 -16.7 .00 3.75 -17.6 . 00 01

VO 079 4.29 -4.2 .00 4.30 -5.5 .00 01

V00 83 4.40 -1.7 1.44 4.50 -1.2 1. 12 01 V0085 4.12 -7.8 .79 4. 12 -9.4 .84 *70 DATA RECEIVED LATE

VO 0 86 5.05 12.9 1.44 5. 10 12.0 .00 01 V0090 4.54 1.5 1.27 4.65 2.2 .93 01 V0092 4.22 -5.6 .79 4.30 -5.5 .56 01 V0095 4.55 1.7 .00 4. 80 5.4 .00 01

VO 1 00 4.50 .6 .00 4.75 4.3 1. 12 01

VO 120 X 4.29 -4.0 19.09X 4.76 4.6 14.72X 01

VO 126 4.30 -3.9 2.42X 4.55 -o 1 . 56 01

VO 144 4.41 -1.4 .32 4.42 -2.9 .40 01

VO 146 4.75 6.2 1.44 4. 80 5.4 1. 12 01

VO 149 4.35 -2.8 .46 4.38 -3.7 .45 01

VO 150 5. 12 14.6 2.37X 5. 15 13. 1 4. 1 IX 01

VO 152 4.15 -7.2 .00 4.35 -4.5 1. 12 01

VO 154 4.75 6.2 .00 4.82 6.0 .28 01 VO 156 4.32 -3.3 .98 4.45 -2.3 1.02 01

VO 158 4. 15 -7.2 .53 4.30 -5.5 1. 12 01 VO 160 4.35 -2.8 1.93 4.52 -.6 1.33 01 VO 161 4.30 -3.9 .53 4.30 -5.5 1. 12 01

VO 166 4.40 -1.7 .00 4.50 -1.2 .97 01

VO 169 4.30 -3.9 1.05 4.40 -3.4 1.53 01

VO 171 4.55 1.7 4.73X 4.60 1.0 .56 01

VO 182 3.97 -1 1.2 2. SAX 4. 05 -11.0 .76 01

VO 190 4.31 -3.6 .75 4.45 -2.1 1. 16 01 V0207 4.60 2.8 1.05 4.55 -. 1 1. 12 01 V0208 4.34 -3.0 1. 10 4. 36 -4. 1 1. 57 01 V0211 4.30 -3.9 .00 4.30 -5.5 1. 12 01 V0213 4. 87 9.0 1.58 4. 82 6.0 1.04 01 V0214 * 4.55 1.7 2.02 4.90 7.6 2.12 01 V02 17 4.50 .6 .00 4.67 2.7 .00 01 V0218 4. 55 1.7 .00 4.50 -1.2 .97 01 V0221 4.30 -3.9 .53 4.30 -5.5 1. 12 01 V0238 5.00 1 1.8 .00 5. 05 10.9 1. 18 01

VO 2 43 4.47 .0 .77 4.39 -3.5 1. 23 01 V0249 4.25 -5.0 4. eox 4.25 -6.6 2. 42X 70 DATA RECEIVED LATE

4.47 - GR. MEAN - 4.55 3 TEST DETERMINATIONS

.33 * SD MEANS - .33 38 LABORATORIES IN GRAND MEANS

.05 - AVER SDR -

. 05 41 LABORATORIES REPORTING

MINUTE - UNIT MINUTE

22
MATERIAL

X93-X94

SCORCH TIME

MATERIAL X91-X92 4.47 MINUTE MATERIAL X93-X94 4.55 MINUTE

23
INTERLABORATORY PROGRAM 0N EVALUATION OF RUBBER

REPORT 40 - 5 CURE TIME ( SOM MH) - MINUTES JUNE 1979 MATERIAL 291 -X92 MATERIAL X93-X94 COMMERCIAL TIRE TREAD COMMERCIAL TIRE TREAD

LAB MEAN % BEL MEAN « REL VAR CODE F MI NUTS DBV SDR MINUTE DBV SDR CODE INSTRUMENT, UNIT, OR OTHER VARIATION

V0061 6.30 -1.9 .24 6,47 -1.2 .75 01 V0O64 X 13.57 99.9 .95 13.78 99.9 .20 96 EXTREME TEST RBSULTS

V0071 6.25 -2.7 .00 6.30 -3.9 1.51 01 V0074 X 13.89 99o 9 1.69 13,76 99.9 2.42X 98 EXTREME TEST RESULTS

V0073 « 5. 47 -14.7 .48 S.SO -16. 1 . 00 01 VQ079 6. 16 -4.0 .00 6.30 -3.9 .00 01

V00 83 6.65 3.6 .95 6.75 3.0 1.00 01

VO 085 6.30 -1.9 .48 6. 17 -5. 8 1.00 70 DATA RECBIVED LATE

VO 0 86 6.60 2.8 .48 6.60 .7 • 00 01 V0090 6.44 .3 1.33 6.55 -o 1 1.79 01 V0092 6.05 -5.8 1. 19 6,20 -5.4 .75 01 3095 6.70 4.3 .00 6.85 4.5 .00 01

VO 100 6.55 2.0 1.30 6.80 3. 8 .50 01

vo 5 ro X 6. 10 -5.0 12. 19X 6.70 2.2 10.60X 01

VO 128 6.20 -3.4 1.30 6.40 -2.4 1. 00 01

VO 144 6.49 1.1 .72 6.57 .2 .20 01 VO 146 6.75 5. 1 lo 43 6.85 4.5 1.00 01

VO 149 6.35 -1.1 .48 6.36 -2.9 .47 01 VO 150 7.12 11.0 4. 13X 7.40 12.9 2. 01 01 VO 152 5.95 -7.3 .48 6o 25 -4.6 1. 00 01

VO 154 6.95 e .2 .81 7.07 7.9 .75 0 1 VO 156 6.35 -l. l .95 6.42 -2.0 .50 01 VO 158 6.00 -6.6 1.90 6.10 -6.9 2. 01 01

VO 160 6.41 -. 1 1.87 6.62 loO .44 01

VO 1 6

6.10 -5.0 1.30 6.30 -3.9 1. 83 01

VO 166 6.40 -.3 .95 6.50 -.8 1. 37 01

VO 169 6.30 -1.9 1. 30 6.45 -1.6 1.00 01

VO 171 6.45 .4 1. 90 6.70 2.2 .50 01

VO 182 5.87 -8.5 1.84 6. 00 -80 5 1. 17 01

VO 190 6.29 -2. 0 .83 6.49 -1.0 .72 01

VO 2 07 6.40 -.3 .48 6.60 .7 2.68X 01 V02 08 6.55 2.0 .88 6.62 1.0 .59 01 V0211 6.40 -.3 .48 6.45 -1.6 1. 00 01 V0213 6.90 7.S 1.80 6.90 So 3 2.40X 01 V0214 * 6.77 5.5 2.95X 7. 15 9. 1 2.42X 01

VO 2 17 6.42 . 1 3.09X 6.77 3.4 .50 01

V02 1 8 6.55 2.0 .48 6.55 -. 1 1. 87 01 V0221 6.35 -1. 1 .48 60 4 0 -2.4 1. 00 01 V0238 7.25 12.9 .00 7.31 1 1. 5 .60 01

VO 2 43 6. 40 -.3 .39 6.37 -2.7 1. 13 01

VO 249 6.00 -6.6 3. 1SX 6. 00 -8.5 2. 17 70 DATA RBCEIVED LATE

6.42 - OR. MEAN - 6.55 3 TEST DETERMINATIONS

.35 • SD MEANS • .36 36 LABORATORIES IN GRAND MBANS

.06 - AVER SDR *

. 06 41 LABORATORIES REPORTING MINUTE UNIT M I NU'J

24
MATERIAL

X93-X94

CURE TIME (507. MH

)

MATERIAL X91-X92 6.42 MINUTE MATERIAL X93-X94 6.55 MINUTE

25
INTEBLAB0HATORT PROGRAM ON EVALUATION OF RUBBER

REPORT 40 - 5 CURE TIME ( 90% MH) - MINUTES JUNE 1979 MATBRIAL X91-X92 MATERIAL X93 -X94 COMMERCIAL TIRE TREAD COMMERCIAL TIRE TREAD

LAB MEAN * REL MEAN * REL VAR CODE F MINUTE DEV SDR MINUTE DBV SDR CODE INSTRUMENT. UNIT. OR OTHER VARIATION

V0Q61 9.82 -2.0 .28 10.20 .4 .82 01

VO 064 X 20*49 99.9 .80 20.77 99.9 .20 98 EXTREME TEST RESULTS

VO 071 9*80 -2.2 .57 9.85 -3o 0 .90 01 V0074 X 21. 16 99.9 1.35 21. 11 99.9 1.72 *98 EXTREME TEST RESULTS

VO 076 8.57 -14.4 1.23 8.60 -15.3 1.28 01 V0079 9.36 -6.6 .00 9.79 -3.6 . 00 01

VO 063 10.70 6* 8 1.14 10.75 5. 8 1. 12 01 V0085 9.42 -6. 0 1.14 9.55 -6.0 .75 70 DATA RECEIVED LATE

VO 0 86 10.40 3.8 1.06 10.45 2.9 .30 01

VO 090 9.98 -.4 1.29 10.04 -1.2 1.53 01

VO© 92 9.37 -6.5 1.09 9.50 -6.5 .30 01 VO© 95 10.45 4.3 .00 10.50 3.4 .00 01

VO 100 10.70 6.8 .78 10.70 5.3 .60 01 VO 120 10*37 3.5 12. 05X 10.50 3.4 1 1. 16X 01

VO i 28 9.45 -5.7 1.61 9.70 -4.5 .60 01

V0 144 10.00 -.2 .53 10.22 .6 .39 01

VO 146 10.55 5.3 .49 10.50 3.4 . 82 01

VO 149 9.77 -2.5 .52 9.87 -2.8 . 80 01

VO 150 11.37 13.5 2.66X 1 le 30 11.3 1.91 01

VO 152 9.30 -7.2 .57 9.50 -6.5 .00 01

VO 154 11. 17 1 1. 5 1.00 11.27 11.0 1.01 01 VO 156 9.85 -1.7 .75 10.00 -1.5 . 30 01

VO 158 9.40 -6.2 1.42 9.40 -7.5 1.50 01

VO 160 10.02 .0 2. 02 10.27 1.2 . 36 01

VO 161 9.50 -5.2 1.48 9.90 -2.5 1. 20 01

VO 166 9.60 -4.2 .28 9.80 -3.5 .00 01

VO 169 9.75 -2.7 1.06 10.00 -1.5 .30 01

VO 171 X 9.25 -7.7 3.69X 10.25 .9 .60 01

VO 182 9.22 -8.0 .89 9.25 -8.9 . 96 0 1 VO 190 10.23 2. 1 .83 10.46 3.0 .57 01

VO 2 07 10.35 3.3 1.24 10.85 6.8 1. 70 01 V02 08 10.01 -. 1 1.70 9.79 — 3. 6 2.22 01 V02 1

10.00 -.2 1.32 10. 10 -.6 1. 20 01 V0213 10.90 8.8 1.44 10.75 5.8 1.73 01 V0214 10.70 6.8 2.98X 1 1.20 10.3 2. 75X 01 V0217 9.50 -5.2 1.42 10. 12 -.3 .00 01 V0218 9.90 -1.2 .28 10.00 -1.5 1.32 01 V0221 9. 85 -1.7 .57 9.70 -4.5 .30 01

VO 236 1 1.25 12.2 1.42 1 1.25 10.8 1. 50 01

VO 243 9.61 -4.1 .70 9.55 -6.0 1.43 01 V0249 * 9.00 -10.2 4.99X 8.75 -13.9 3.76X *70 DATA RECBIVED LATE

10.02 - OH. MBAN • 10. 16 3 TEST DETERMINATIONS

.63 • SD MEANS • .61 36 LABORATORIES IN GRAND MEANS

.10 - AVER SDR - .10 41 LABORATORIES REPORTING

MINUTE - UNIT - MINUTE

26
MATERIAL

X93-X94

CURE TIME (90% MH

)

MATERIAL X91-X92 10.02 MINUTE MATERIAL X93-X94 10.16 MINUTE

27
XNTERLABORATORY PROGRAM ON EVALUATION OF ROBBER

REPORT 40 - 5 MINIMUM TORQUE - POUND-INCHES JUNE 1979 MATERIAL X91-X92 MATERIAL X93-X94 COMMERCIAL TIRE TREAD COMMERCIAL TIRE TREAD

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

V006X 4® 95 .5593 -4.4 .54 5.25 .5932 -.4 1.28 01 V0064 4. 92 .5565 -4.9 .39 5. 05 . 5706 -4.2 .00 0 1 V0071 4® 65 .5254 -10. 2 .00 4.75 .5367 -9.9 1.37 01 V0O74 4© 80 .5424 -7.3 2. 17 4.62 e 5226 -12.3 2.24 01 V0078 5.00 .5649 -3.4 .00 5.25 .5932 -.4 .00 01

V0079 5.07 .5734 -2.0 .00 5. 12 . 5791 -2.8 .00 01 VO© 83 5.85 .6610 13.0 2. 10 6.05 .6836 14. 8 1.69 01

VO 0 85 4.78 .5400 -7.7 .00 4.87 • 5500 -7.6 .00 74 ORIGINAL IN NEWTON-METER REC'D LATE

VO 0 86 6. 10 .6892 17. 8 1.97 6.20 . 700S 17.6 1.73 01

VO 090 4.51 .5101 -1 2. 8 .56 4.57 .5169 -13.2 4.28X 0 1

¥00 92 6. 10 .6892 17. 8 .79 6. 15 o 6949 16.7 • 00 01

VO 095 4.60 .5198 -1 1. 1 ®oo- 4.65 . 5254 -11.8 .00 01

VOX 00 4.60 .5198 -1 1. 1 .00 4.85 o 5480 -8. 0 .37 01

VO 120 * 7.05 .7966 36.2 13.32X 6.90 .7796 30.9 1 1.57X 01

V01 8 5.00 .5649 -3.4 .79 4.95 .5593 -6. 1 .37 01

VO 144 4.75 .5367 -8.2 .39 4.90 .5537 -7.0 .73 01

VO 146 5.00 .5649 -3.4 1. 18 5. 10 .5762 -3. 2 .00 0 1 VO 149 5.55 .6271 7.2 1. 10 5.70 .6440 8. 1 .71 0 1 VO 150 6.75 .7627 3 Oo 4 1.97 6.75 .7627 28. 1 1.83 01

VO 152 4.20 .4746 -18.9 .39 4.35 .4915 -17.5 .37 01

VO 154 5.00 .5649 -3.4 .79 5.30 .5988 .6 .37 01

VO 156 5. 80 o6553 12.0 1.42 5.75 . 6497 9.1 1.60 01

VO 158 5.0 0 . 5649 -3.4 .79 4.85 . 5480 -8. 0 .73 01

VO 160 5. 10 .5762 -1.5 .39 5.40 .6101 2.5 1. 10 0 1 VO 161 4.65 • 5254 -1 0.2 1.18 4.75 . 5367 -9.9 .73 01

VO 166 4.45 .5028 -14.0 .39 4.75 .5367 -9.9 1.00 0 1 VO 169 4.96 .5600 -4.3 . 35 5.04 .5700 -4.3 1.62 40 ORIGINAL IN NEWTON-METER

VO 171 5.00 .5649 -3.4 .20 5.00 .5649 -5. 1 .00 01

V01 82 4.78 .5400 -7.7 .95 4.91 . 5550 -6. 8 1.50 40 ORIGINAL IN NEWTON-METER

VO 190 5. 20 .5875 .5 .79 5. 10 .576 2 -3.2 .37 01

VO 207 X 8.40 .9491 62.3 2.40 9.05 1.0226 71.7 4. 16X 01

VO 20 8 4.37 .4943 -15.5 1.50 4.47 .5051 -15.2 .00 0 1 V0211 5.50 .6214 6.2 .79 5.55 .6271 5.3 .73 0 1 VO 2 13 6.47 .7316 25. 1 .98 6.45 o 7288 220 4 .18 0 1 V0214 5.22 .5904 .9 1.38 5.25 o 5932 -.4 .37 01

VO 2 17 4.55 .514 1 -12. 1 .00 4.75 . 5367 -9.9 .00 0 1 V0218 5.05 .5706 -2.4 1.08 4.90 .5537 -7.0 1.27 01 V0221 4.96 .560 0 -4.3 2.22 5. 18 .5850 -1.8 .97 40 ORIGINAL IN NEWTON-METER

V0238 * 6.00 .6779 15.9 .47 6.43 .7271 22. 1 .79 01

VO 243 X 4.75 .5367 -8.2 5. 9 IX 5.65 . 6384 7.2 1.00 01 V0249 * 5.25 .593 2 1.4 7. 35X 5.75 .6497 9. 1 3.66X 70 DATA RECEIVED LATE

5. 18 .5849 - GS. MEAN ” 5.27 . 5955 3 TEST DETERMINATIONS

.67 .0759 - SO MEANS -

o 65 . 0737 37 LABORATORIES IN GRAND MEANS

.07 .0083 - AVEfi SDK - .08 .0089 41 LABORATORIES REPORTING

LB-INo N-M - UNIT LB- IN. N-M

28
MATERIAL

X93-X94

MINIMUM TORQUE

MATERIAL .X91-X92 5-18 LB-IN, MATERIAL X93-X94 5.27 LB-IN.

29
REPORT 40 5 JUNE 1979

I NTERLABORATORY PROGRAM ON EVALUATION OF RUBBER

MAXIMUM TORQUE - POUND-INCHES

MATERIAL X91-X92 MATERIAL X93-X94 COMMERCIAL TIRE TREAD COMMERCIAL TIRE TREAD

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. 0R OTHER VARIATION

V0061 24.00 2.7118 2.7 .25 24.17 2.7315 2o 8 .43 01

VO 064 22.22 2.5112 -4.9 .74 22.51 2.5440 -4.2 .33 01 V007I 22.90 2.5875 -2.0 .65 22.75 2. 5705 -3.2 1.58 01 V0074 22. 97 2. 5959 -1.7 1.25 22.95 2. 5931 -2.4 2.61X 01 V0078 23.05 2.6044 -1.4 4. 83X 23.40 2.6440 -O 4 .43 01 V0079 22.07 2.4943 -5.6 .00 22.27 2.5169 -5.2 .00 01 VO 0 83 24.90 2.8135 6.5 2. 6 IX 25.05 2.8304 6.6 2. 06 01 V0085 23.06 2.6051 -1.4 .66 23.01 2. 6001 -2. 1 .00 74 ORIGINAL IN NEWTON-METER RBC'D LATE

VOO 86 23.45 2.6496 .3 2.47X 23.40 2.6440 -.4 1.74 01 V0090 22.42 2.5338 -4. 1 1.10 22. 82 2o 5790 -2.9 5.0 OX 01

VOO 92 26.20 2.9603 12. 1 1. 14 26. 15 2.9547 11.3 .75 01 VOO 95 22.90 2.5875 -2.0 .00 22.85 2.5818 -2.8 .00 0 1 VO 100 24. 40 2.7570 4. 4 .49 24.60 2.7796 4.7 1.74 01

VO 120 X 23.0 0 2.5988 -1.6 30.40X 2 2.30 2. 5197 -5. 1 52. 93X 01 VO 128 21.75 2.4575 -7.0 1.87 21.80 2.4632 -7.3 .00 01

VO 1 44 24.70 2.7909 5.7 .49 25. 10 2. 8360 6.8 .00 01

VO 146 22.65 2.5592 -3. 1 1.96 22.85 2.5818 -2. 8 .43 01

VO 149 23. 25 2.6270 -.5 .97 23.40 2.6440 -.4 . 85 01 V01 50 25.00 2.8248 6.9 1.24 24.75 2. 7965 5.3 2.17 01

VO 152 22. 15 2. 5027 -5.2 .00 22. 15 2. 5027 -5. 8 .43 01

VO 154 23.00 2. 5988 -1.6 .49 23. 25 2.6270 -1. 1 .87 01

VO 156 24.65 2.7852 5.4 3.22X 24.45 2.7626 4.0 3.98X 01

VO 158 23.75 2.6835 1.6 1.24 23.45 2.6496 -o 2 .75 01

VO 160 • 27.50 3. 1072 17.6 .49 27.55 3. 1 129 17.2 .43 01

VO 161 21. S5 2.4349 -7.8 1.08 21.75 2.4575 -7.5 .43 0 1

VO 166 21.45 2.4236 -8.2 .49 21.65 2. 4462 -7.9 .43 0 1 VO 169 22.48 2.540

-3. 8 .79 22.48 2.5401 -4.4 1. 15 40 ORIGINAL IN NEWTON-METER

VO 171 20.65 2.3332 -1 1.7 1. 82 20.90 2.3615 -11. 1 1. 15 01

VO 182 21.68 2.4501 -7.2 1.53 21.91 2.4751 -6. 8 2.91X 40 ORIGINAL IN NEWTON-METER

VO 190 22.95 2. 593 1 -1. 8 .49 22.95 2.5931 -2.4 .87 01

VO 207 * 26.55 2.9999 13.6 4.72X 26.90 3. 0394 14.4 6. 04 X 01 V0208 24.02 2.7140 2. 8 1.38 23. 74 2.6824 1.0 3.26X 0 1 V02 1 1 24.50 2.7683 4. 8 1.08 24.45 2.7626 4. 0 1.30 0 1 V0213 24.35 2.7513 4.2 1.31 24.45 2o 7626 4.0 1.52 01

VO 2 1 4 23.87 2.6976 2.1 1. 14 23.97 2.7089 2.0 1.24 0 1 V0217 22.30 2. 5197 -4.6 1.73 22.65 2.5592 -3.6 .00 01

VO 2 18 23. 15 2.6157 -1.0 .49 23.40 2.6440 -.4 1.30 0 1 V02 21 23.45 2.6501 .3 .66 23.76 2.6851 1. 1 1. 15 40 ORIGINAL IN NEWTON-METER

VO 238 23. 25 2.6270 -.5 .62 23.50 2.6553 -.0 .00 0 1 V0243 • 22.20 2.5084 -5.0 3.92X 23.05 2. 6044 -1.9 .43 01 V0249 22.25 2.5140 -4.8 3. 7 IX 22.25 2.5140 -5.3 2.17 70 DATA RECEIVED LATE

23.38 2.6413 - GR. MEAN - 23.51 2.6559 3 TEST DETERMINATIONS

1.45 . 1643 • SD MEANS - 1.41 . 1595 38 LABORATORIES IN GRAND MEANS

.12 .0132 - AVEH SDR - .07 . 0075 41 LAB0RATORIES REPORTING

LB-IN. N-M - UNIT LB- IN. N-M

30
29

28

27

26

25

24

23

22

21

20

19

18

MAXIMUM T0RQUE

8 19 20 21 22 23 24 25 26 27 28 29

MATERIAL X91-X92

31
NBS-114A (REV. B-78)

f?- '. ;

: y U.S. DEPT. OF COMM.

BIBLIOGRAPHIC DATA

SHEET

1. PUBLICATION OR REPORT NO. RUBBER CRP 40

m

4. TITLE AND SUBTITLE

INTERLABORATORY PROGRAMS FOR RUBBER

Analyses No. 40

April -”June’1979

5. Publication Date August 9, 1979

7. AUTHOR(S)

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

8. Performing Organ. Report No. NBSIR 79-1805

9. PERFORMING ORGANIZATION NAME AND ADDRESS

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

[XX For Official Distribution. Do Not Release to NTIS

I 1 Order From Sup. of Doc., U.S. Government Printing Office, Washington, DC

20402, SD Stock No. SN003-003-

I I 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

27

22. Price

USCOMM-DC

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o