NATL INST. OF STAND & TECH R-I.C

A 11 10 5 DMSfi^S

NYAINER

BOARD

report no. 121

October 1979

NBS Collaborative Reference

Program for Containerboard

Fourdrinier Kraft Board Group

American Paper Institute, Inc. and U.S. Department of

Commerce, National Bureau

of Standards

QC100

U56

79-1816

1979
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

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)

AASHTO Bituminous

Asphalt cement (2 times per year)

Cutbacks (once a year)

NBS Collaborative Reference Programs

A05 Technology Building

National Bureau of Standards

Washington, DC 20234

Rev. 3/79
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CONTAINER

BOARD

Collaborative Reference report no. 121

sms* °*** ra79

\°i^

T.L. Cummings

NBS Research Associate

Collaborative Testing

Services, Inc.

J. Horlick

Office of Testing Laboratory

Evaluation Technology,

Office of Engineering Standards,

National Engineering Laboratory

U.S. Department of Commerce, Fourdrinier Kraft Board Group

National Bureau of Standards American Paper Institute, Inc.

NBSIR 79-1816

INTRODUCTION

The Collaborative Reference Program (CRP) for Containerboard is

cosponsored by the Pourdrinier Kraft Board Group (FKBG) of the

American Paper Institute, Inc. and the National Bureau of

Standards. The program is maintained and operated by Collaborative

Testing Services, Inc. (CTS) . CIS is a non-profit organization of

associations that offers CRPs to a wide range of industries.

Sanples of three weights of linerboard, nominally 26 lb, 42 lb, and

69 lb and of corrugating medium (26 lb) are separately randomized

from uniform narrow rolls and packaged for distribution to the

participants. Each month, sufficient test material for four weekly

tests is mailed to participants for testing Mullen bursting

strength according to TAPPI official testing method T807 os-75 or

Concora flat crush strength according to TAPPI official testing

method T809 os-71. The participants return their test results to

NBS for analysis and receive two monthly reports from NBS. One

report is a preliminary individualized report comparing a

laboratory's results with the industrial mean. The other is a longer report (as illustrated by this report) showing the data from

all participants.

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

reports in general, contact Thomas L. Cummings or Jeffrey Horlick

on (301) 921-2946.

Jeffrey Horlick, Technical Administrator

NBS Collaborative Reference Programs

Office of Testing Laboratory Evaluation Technology

November 30, 1979
'
TABLE OF CONTENTS

Page

1 Explanation of Tables

4 Instrument Codes

5 Use of Average Mean as a Reference Standard

6 Bursting Strength, Linerboard 42L1, weeks 1-4

8 Bursting Strength, Linerboard 26K1, weeks 1-4

10 Concora Flat Crush, Corrugating Medium 26D2

EXPLANATION OF TABLES

Each table shows laboratory test results for Mullen bursting strength

of linerboard or Concora flat crush strength of corrugating medium.

The data are divided into three time spans. On the left of each table

is an analysis for each week of the month. In the center is cumulative

data for the month and on the right is cumulative data for up to 16

weeks.

Conservative statistical tests have been used in excluding extreme

data from the analyses. Thus, where the mean (average) for one laboratory is compared with the average for many laboratories, limits have

been used that would exclude only one laboratory in a hundred if all

laboratories followed exactly the same testing procedure. Consequently,

laboratories receiving MX" flags should review their testing procedures,

instrument calibration, and control processes. Similar conservative

criteria were used in flagging within- laboratory standard deviations

and other statistics.

LAB MEANS THIS MONTH

WEEKLY VALUES : CODE V WK-1 WK-2 WK-3 WK-4

LAB CODE - Confidential laboratory identification number known only to the

participant and the Collaborative Reference Program staff.

V - Code for indicating instrument type, units used, and any other

variation in test procedure or conditions. A '+' in this column

means a non-standard variation. Data marked '+’ are not included

in the combined averages for all laboratories, (see page 4).

MEANS THIS MONTH - For each laboratory each weekly mean is the average of

individual test determinations, usually an average of 20

determinations

FLAGS (following means and standard deviations) -

X - Data excluded from an AV MEAN or average standard deviation

because value deviated from the AV MEAN or average standard

deviation by more than 2.576 times the appropriate standard

deviation. A laboratory following the prescribed test method

could obtain such an extreme value by chance only one time in

a hundred . Corrective action is almost certainly required .

* ~ Data included in the CUMULATIVE AV MEAN but the value deviated

from this mean by more than 1.960 and less that 2.576 times the

SD CUM MEAN. A laboratory following the prescribed test method

could obtain such an extreme value by chance only one time in

twenty . Corrective action may be desired.

1
s - This is a warning to the laboratory but does not affect inclusion

or exclusion of the laboratory's results from the corresponding

AV MEAN. This flag indicates an extremely high or low within-laboratory standard deviation (SDR, not shown) that could occur by

chance only one time in a hundred if the laboratory is following

the prescribed test method.

AV MEAN - (at bottom of table) - The average for the indicated week of the

means for all laboratories, except those laboratories marked '+' in column V and those means marked with an 'X'.

SDR - (not shown) - The standard deviation of within- laboratory measurements; i.e., the Standard Deviation of the Replicate measurements

made at one time in one laboratory on one package of test pieces.

AV SDR - The average for the indicated week of the SDR's of all the laboratories, except those omitted from the AV MEAN. Also an extremely

high or low SDR as compared with the AV SDR based on the remaining

laboratories is omitted from the AV SDR and the letter 'S' is

placed after the laboratory mean for that week. The AV SDR is an index of the within- laboratory precision for repeated measurements;

i.e., a measure of the ability of an average laboratory to repeat

its results over a short period of time. It includes measurement

error and sample variation.

SD LABS - For each week the standard deviation of the means about the AV MEAN

for that week after omitting those means marked with an 'X' or noted '+' in column V. The SD LABS is an index of the among- labora

tory precision of the test method as applied by the participating

laboratories; i.e., a measure of the ability of laboratories to get

comparable results.

NO. INCL The number of laboratory means included in the AV MEAN for that

week.

NO. OMIT - The number of laboratory means reported but omitted from AV MEAN

because of non-standard equipment, environment or procedure ('+' in

column V) or because of extreme results (X following mean).

NOT ROD - The number of laboratories failing to report data on time or in

usable form for this week (but who reported data for at least one of the other weeks of this month) , or who received test pieces

from a different sample of material and whose data therefore are shown in another table of this report.

SD SHTS - (Concora only) The average for the indicated week of the among

sheet within- laboratory standard deviations. The SD SHTS is an index primarily of the variability among sheets.

2
THIS MONTH

VALUES THIS MONTH: MEAN SDR SDWKS

MEAN - The average for the indicated laboratory of the reported weekly

MEANS THIS MONTH.

SDR - The average for the indicated laboratory of the weekly SDRs for

the current month.

SDWKS - For the indicated laboratory, the standard deviation among the

laboratory's weekly MEANS THIS MONTH (including those means

marked with an 'X').

CUMULATIVE

CUMULATIVE VALUES : MEAN SDR SDWKS WKS

MEAN - The average for the indicated laboratory of all its weekly means

for the number of weeks indicated, including those for the current

month. An '*' or 'X' following this CUMULATIVE MEAN indicates the

laboratory is running consistently low or high. (See above for

explanation of these flags)

SDR - The average for the indicated laboratory of the weekly SDRs for

the indicated number of weeks.

SDWKS - For the indicated laboratory, the standard deviation among the

laboratory's weekly means (including those means marked with an

'X'). SDWKS is an index of the week to week precision; i.e., a measure of the ability of a laboratory to repeat its results from

week to week.

WKS - Number of weeks for which usable results have been reported by

that laboratory. At most, 16 weeks of data are included.

GRAND AVERAGES

GRAND AVERAGES: THIS MONTH CUMULATIVE 12 WEEKS

THIS MONTH - Averages for the four weeks of the quantities shown to the left.

CUMULATIVE - Averages for

weeks of the

the indicated number of weeks, including the four

current month.

3
AV SDWKS - The average of the SDWKS for all laboratories excluding those

marked '+' in column V or with an 'X' following the corre- sponding THIS MONTH or CUMULATIVE MEAN or SDWKS.

SD CUM MEAN - The larger of either (1) the standard deviation of the

CUMULATIVE MEANS about the average CUMULATIVE MEAN after

omitting those CUMULATIVE MEANS marked with an *X' or with

a *+* in column V, or (2) the CUMULATIVE SD LABS divided by

the square root of the number of weeks cumulated. The

former will be appreciably larger than the latter only when

there are persistent systematic differences among the

laboratories.

Code

INSTRUMENT CODES

FOR

MULLEN BURST OF LINERBOARD

(Column V)

Description

A

H

IJ

L

M

R

X

Model A, Manual Clamp

Model AH, Hydraulic Clamp

Model A, Hydraulic Clamp added

Jumbo, Hand Clamp, Hand Driven

Lhcmargy, Hydraulic Clamp, in kPa

Model AH, Hydraulic Clamp, Transducer

Model A, Air Clamp added

Other Model, Please Describe Instrument

Make and Model

Y

Z

Nonstandard Instrument or Method

Data received too late to be included

in statistical analysis

Code

INSTRUMENT CODES

FOR

CQNCORA TEST OF MEDIUM

(Column V)

Description

Z Data received too late to be included

in statistical analysis

4
Use of Average Mean as a Reference Standard

A large supply of linerboard in three weights was randomized and placed

in sealed packages ready for shipment. The supply for each weight of

board was divided into several narrow "rolls" or cross-machine "positions"

of a larger roll, and each position was separately randomized. Each

package contains test pieces from one position only. The position is

designated by the number following the letter in the code marked on the

package. Thus 42H 1^ indicates that this package contains 42 lb board

from position 1 of lot H. Samples from the first position are distributed

until exhausted, then from the second position, and so forth for each

weight of board. Thus for short periods of time (several weeks to months),

the samples that the participants test are from the same position of a lot,

and for a longer period from the same lot.

The three weights of linerboard distributed in this program may be used as reference standards. The best reference values are the cumulative grand

AV MEANs in the latest reports. These values are given at the bottom right

of each table. For each weight of board, comparisons should be made first

for measurements made on the same position, i.e., for checking your current

measurement, use grand AV MEANs that have the same position code as on the

packages being tested. The position is shown in the upper left corner of

the table. If no report is yet available on the current position, grand

AV MEANs from previously tested positions of the same lot may be used as approximate reference values.

Similarly a large supply of a 26 lb corrugating medium was randomized,

after dividing into several narrow rolls or positions. The above

discussion for linerboard also applies to the corrugating medium.

We are currently using the fourth lot of linerboard and the fourth

lot of corrugating medium:

Lot Material Codes Used

1 linerboard A, B, C October 1969 - April 1973

2 linerboard D,E,F September 1972 - September 1976

3 linerboard G, H, I ,

October 1976 - September 1979

4 linerboard K,L,M September 1979 -

1 corrugating medium (A) May 1973 - March 1976

2 corrugating medium B April 1976 - February 1977

3 corrugating medium C March 1977 - August 1978

4 corrugating medium D Septemher 1978 -

5
L2NERB0ARD 42L1 COLLABORATIVE REFERENCE PROGRAM OCTOBER 1979 REPORT NOc 121 BURSTING STRENGTH (MULLEN). PSI

LAB MEANS THIS MONTH THIS MONTH CUMULATIVE

CODE V WK-1 WK-2 WK-3 WX-4 jCEAN SDR Siiwxs MEAN SDR SDWKS WKS

100 H 1 14c 9 1 15c 0 1 140 5 114o 2 1 140 7 50 0 o 4 1 15. 4 6o 0 1.2 6

101 H 1 190 3 1 20o 3 120. 3 12 lo 0 A 20o 2 40 7 .7 120o 2 4.7 © 7 4 102 H 1 160 1 1 16© 9 1 10.5 111.9 1 150 4 5© 1 2.3 1 15o 8 5.9 2.4 6 103 I 1 130 7 114.7 1 1 4o 4 116. 8 1 140 9 50 0 1.3 115.2 5. 1 1.6 6 105 M 12 lo 3 1 18.9 119.2 120. 3S 119.9 0O 4 1. 1 119o 5 8.3 1.4 6

106 H 1 1 40 5 120© 9 122. 1 118,7 119. l 7.8 3.4 1 17. 9 7o 6 3.7 6 108 M 1 170 1 1 13© 7 116. 4 115. 1 1 15© 6 6© 8 1.5 1 150 6 6. 8 1.5 4 109 H 1 10© 6 1 1 7© 8 114. 1 1 1 So 2 1 15. 2 8.7 3.6 112.5 8.5 5. OX 6 110 M 115© 2 1 15© 8 1 1 3o 4 1 l«o S 1 14. 8 60 9 1.0 114. 4 7o 5 1.0 6

11 1 M ! 13©5 112.9 1 16.6 113,7 1 140 2 Qc7 1.7 1 14. 6 8.6 2.4 6

112 H 1 15© 6 108. 1 1 09© 8 110.9 ill. 1 4.4 3.2 110.2 4. 6 3.0 6 113 R 1 18© 7 1 17. 1 1 19 0 3 1 19o9 1 180 6 60 3 1.2 1 17.9 6.7 1.7 6 114 M 1 14© 6 1 12.2 121.2 1 16.9 116.2 6.7 3. 8 1 16o 6 7.5 3.0 6 115 R 1 16© 8 123.0 1 16. 1 121. 2 1 1 9o 3 40 6 3.4 1 170 3 5.4 4. 1 6 117 H 1 12© 4 ioe©9 110.5 111.6 1 10. 9 6© 5 1.5 109.7* 7.5 4. 1 6

119 H 1 14© 4 1 17.7 113. 1 117.4 1 15© 6 6. 4 2.3 1150 4 7.2 1.9 6 120 R 1 04© 8X 107© 3 109.3 107.9 1 07. 3X 5.9 1.9 111.6 6o 0 6. ex 6 121 M 1 19® 6 1 18.4 1 15.5 115.7 1 170 3 7.6 2.0 1 17. 7 7. 1 1.8 6 123 R 1 09® 4 1 03© 5X 1 1 lo a 1 130 8 1 090 6 7.3 40 5 1 08. 5* 70 3 4. 1 6 125 I 1 190 3 122. 1 119.0 116.2 1 19© 2 6© 0 2.4 1 18. 1 6.4 2.5 6

127 H 1 10. 6 1 1 1.0 110.2 112.2 1 11. 0 6.2 .9 111. 1 6.3 1.0 6 128 H 1 15® 4 1 12.3 110.9 113. 1 1 12. 9 7o 8 1.9 113.0 7.5 1.6 6 129 R 106©5X 104.9 108.7 118.7S 109.7 5.6 6.2 1 08o 6* 5o 0 5. IX 6

130 H 1 13©0 1 16® 8 114.6 117.5 1 15. 5 8© 1 2. 1 1 15. 5 8. 1 1.6 6

131 R 1 13©0 1 16. 9 1 14.9 113.9 1 14. 7 CM No 1.7 1 14. 7 7. 1 1.3 6

133 A 1 15© 6 1 15.5 A 14.3 122. 1 1 160 9 6o 3 3. 5 1 170 1 6.3 2.8 h

134 H 1 18® 1 12 1.3 119.4 122.2 120. 3 60 2 1.8 120. 1 6o0 1.5 6 135 I 12 1 0 7 120© 4 112. 1 111.8 1 160 5 7© 1 5.3 1 17. 8 6.9 4. 6X 6 136 H 1 14o 0 1 13.8 113.4 109.5 1 12. 7 7© 0 2. 1 1 1

2

0 7 7.0 2. 1 4 137 H 1 19© 1 1 19© 5 126.6X 121.0 1 2 lo 6 7.9 3. 5 121. 4 6o 4 3.5 6

138 H 1 16©6S 1 16© 3 118.2 1 1 8. 6 1 170 4 9© 0 1. 1 1 17. 7 8.8 2.2 6 139 R 1 26© 9X 124© 8 124® 8 122.2 1240 7X 6© 8 1.9 124. 4X 7. 1 1.6 6 140 H 11 1©4 112.4 11 2© 2 1 l2o 9 1 120 3 60 5 o 6 113.2 6o 0 1.6 6

141 M 1 150 4 1 12® 4 115.3 1 13.8 1 14 0 2 60 3 1.4 114. 0 6. 3 1.5 6 142 A 1 140 8 109© 7 1 13.2 103. 1 1 1 1. 5 7© 2 3. 1 11 lo 1 7. 0 2.7 6

143 H 121.9 1 2 1 o 9 6.9 122. 2* 8.0 .5 2 145 H 1 16© 1 112© 6 10 So 1 1 17.2 1 13. 5 60 3 4. 1 1 13. S 6.2 3.6 6 147 H 1 1 1 0 4 1 13©7 112.2 115.2 1 130 2 6© 8 1.7 1 1 2o 5 6o 9 1.9 6 149 H 1 24o OX 1 2 1 o 5 120. 0 119.0 1 21 o 1 7.4 2.2 1 20o 7 7. 1 2. 1 6

151 H 1 160 7 1 170 1 1 18. 7 1 1 5o 2 1 16. 9 6© 6 1.4 1 16. 8 7.2 1.2 6

153 H 1 28 0 8X 1 30© 6X 126.3X 127 0 IX 1 28. 2 X 9© 2 1.9 127. ex 9o 3 2. 1 6 155 H 1 1 50 3 1 1 6© 7 118.4 1 1 50 3 1 160 5 80 5 lo 5 1 16. 8 8.0 1.4 6 157 X I 1

7

0 5 1 14© 6 1 1 3© 4 120. 1 1 16. 4 7© 1 3.0 1 16o 7 6.7 2.6 6

161 X 1 1 8©7 1 16©7 1 150 0 114.0 1 16© 1 70 8 2.0 117 0 1 7.6 2.2 6 163 H 1 12© 2 109© 9 1 12. 2 113. 1 111,9 60 2 1.4 1 1 lo 7 6.2 1.2 5

165 R 1 13© 3 1 15. 8 1 15.4 113.0 1 14. 4 7.9 1.4 1 14. 8 7.5 1.5 6 166 H 118.9 1 19. 6 122. 1 120. 2 7.9 1.7 119.6 8. 0 1.4 .5 167 H 1 17©0 115.4 111.0 113.9 1 14. 4 7.4 2.6 114. 1 7.3 2.1 6 169 I 1 150 1 1 19© 3 1 18. 4 1 14. 2 1 16© 8 60 6 2.5 11 5o 7 60 2 2.5 6

171 H 1 16 0 3 111.8 114.5 116.6 1 14. 8 60 8 2.2 1 15 0 1 7.4 1.8 6

172 H 1 17©0 1 1 5. 6 113. 2 l 1 0 o 7 1 14. 1 6. 5 2o 8 1 14. 6 7.0 2.5 6 173 H 1 170 2S 1 15. 1 1 15.6 115.8 1 15. 9 4© 0 .9 115.9 40 OX .9 4 174 H 1 15© 4 1 16© 9 1 13.3 113.0 1 14. 7 6.5 lo 8 114. 8 7.4 1.4 6

175 H 1 1

6

0 9 115.2 116.7 1 14.6 1 150 9 7.5 1. 1 1 1 5o 3 7.4 1.9 6 176 H 1 16©0 1 IS© 4 119.7 113.6 1 160 2 80 4 2o 6 1 16. 0 8. 4 2.1 6

6
LI KERB SARD 42L1 COLLABORATIVE REFERENCE PROGRAM

REPORT NO. 121 BURSTING STRENGTH (MULLEN), PSI

OCTOBER 1979

LAB MEANS THIS MONTH THIS MONTH CUMULATIVE

CODE V WK-1 WE-2 WK-3 WK-4 MEAN SDR SDWES MEAN SDR SDWES WKS

177 H IO 80 OX 106. 6 107.8 1C9.5S 1080 1 9© 2 1 . 1 107. IX 8. 8 2.0 6 182 H 1 15© 4 123.8 1 17. 6 119.1 119.0 6.4 30 6 1 18. 5 6. 8 3o 0 6 184 H 12 2 0 1 1 17.7 121.9 117.2 1 19. 8 80 4 2.6 1 19o 2 7. 5 2.2 6 186 I 1130 1 107. 8 1

1 © 8 114.9 111.9 60 0 3.0 113. 4 60 2 3.9 6 188 I 1 150 2 112.3 117. 4 117.4 1 15, 6 7© 4 2.4 II 60 8 7.3 2.7 6

198 R 1 180 4 114.7S 112©2 111.8 114,3 80 1 3o 0 114. 3 80 1 3.0 4 250 L 103o IX 101o IX 102, IX 8© 4 1.4 102. 6X 9. 1 1.0 4 274 H 1 14© 8 114.9 115.3 115.0 1 15. 0 60 5 0 2 116. 1 60 4 1.6 6 283 H 1 17© 2 1 19.0 1 18.3 120.4 1 180 7 6© 5 1.3 118. 2 60 2 1.6 6 287 A 1 22© 4 12 2. 1 116.7 125.6X 1 21o 7 6© 7 3.7 1 20o 7 7.2 3.3 6

350 H 1 13© 8 112. 3 115. 1 107. 2 1 120 1 5.4 3.5 112. 1 9. 4 3.5 4 553 M 1 15© 1 1 13.7 11 6© 9 113.0 1 140 7 80 3 1.7 1 15. 4 7.9 1.8 6 562 A 1 250 6X 123.9 1 3 1 © OX 13O 0 ax 1 27o ex 80 6 3. 6 127o 9X 9.0 3.0 6 568 I 1 16© 9 1 10.6 1 O 80 3 1 1 3o 7 112. 4 7© 9 3.7 1 15o 6 8.9 7. ex 6 569 A 13

0 3X 127. 5X 121 © 8 125.0 126. 4X 80 6 4o 0 125. 4X 7. 8 3.5 6

65 8 H 1 17.7 118.2 1 17© 3 1 18o 1 1 170 9 7o 0 0 4 1 180 3 6.9 #8 6 682 X 1 18© 5 118.2 107.5 110.5 1 13, 7 60 5 5.6 1 140 5 6. 3 4.5 6 701 H 1 16© 9 116.7 115.9 USoO 1 16, 9 7© 1 0 8 1 16. 8 7© 6 1. 1 6

GRAND AVERAGES

WK-1 WK-2 WK-3 WK-4 THIS MONTH CUMULATIVE 6 WEEKS AV MEAN 1 150 8 1 150 7 115. 5 1 1 5o 6 AV MEAN 1 1 5o 6 1 15 0 8 AV SDR 7© 1 6© 9 D. 8 6.8 AV SDR 60 9 7© 0 SD LABS 2© 8 4©4 3.9 3o 3 SD LABS 3© 7 3.8

N0o INCL 60 65 66 64 N00 INCL 630 7 62.3

NO© OMIT 12 7 6 6 AV SDWKS 2© 3 2 © 1 NOT RCD 1 1 1 3 SD CUM MEAN 3© 1

7
LINERB6ARD 26K1 COLLABORATIVE REFERENCE PROGRAM OCTOBER 1979 REPORT NO. 121 BURSTING STRENGTH (MULLEN), PSI

LAB MEANS THIS MONTH THIS MONTH CUMULATIVE

CODE V WK-1 WK-2 WK-3 WK-4 MEAN SDR SDWKS MEAN SDR SDWKS WES

100 H 79.9 80.3 7 8o 5 77.8 79. 1 6© 5 1.2 79. 1 6© 5 1.2 4 101 H 720 7 72.9 73.3 75.4 73. 6 50 8 1.2 73o 6* 5© 8 1.2 4 102 H 78.4 80.2 78.0 77o 2 78. 5 5© 6 1.2 78. 5 5© 6 1.2 4 103 I 77.7 79. 1 7 8. 3 78.0 78. 3 4© 8 .6 780 3 4© 8 .6 4 105 M 87.3 82.3 83. 7 84.8 84.6 6© 6 2.1 84o 6 60 6 2. 1 4

106 H 79c 3 84. 2 85.4 83. 5 83. 1 7© 7 2.7 83© 1 7© 7 2.7 4 108 M 78.6 78.5 80.8 79.3 79.3 6© 4 1.0 79 0 3 60 4 1.0 4 109 H 73o2S 80. 1 76.5 82.4 78.0 6© 8 4. 0 78o 0 60 8 4o 0X 4

1 10 M 83.8 83. 1 84.4 83.7 830 7 6© 3 .5 83c 7 60 3 .5 4

11 1 M 78.2 81,3 79.9 79.5 79. 7 6© 3 1.3 79o 7 6© 3 1.3 4

112 H 71.6 7,3. 4 71.9 75.8 730 2 5© 9 1.9 73o 2* 5©9 1.9 4 113 R 78.7 79.4 81.4 81.6 30. 3 5© 4 1.4 80c 3 5© 4 1.4 4 114 M 81.

84. 5 79.3 79.3 81. 2 6© 5 2.4 Slo 2 60 5 2.4 4

1 1 5 R 77.8 80.8 76.2 80.8 7 8o 9 5© 5 2.3 70o 9 5© 5 2.3 4 117 H 8 lo 5 76.7 77.4 77c 6 780 3 6© 4 2.2 78o 3 6© 4 2.2 4

119 H 79o 9 82c 4 81.0 79 0 3 80.7 6© 2 1.4 80 o 7 6© 2 1.4 4 120 R 75.7 78. 6S 78o 8 78.9 780 0 7© 1 1.5 780 0 7© 1 1.5 4 121 M 84. 4 85.5 81.5 85. 4 84. 2 60 1 1.9 84o 2 60 1 1.9 4 123 R 730 7 76.0 75. 1 79.4 76. 1 60 9 2.4 76. 1 6© 9 2.4 4 125 I 84.9 83. 1 84.5 87o 9 85, 1 5© 6 2o 0 85o 1 5o 6 2.0 4

127 H 76o 1 78.7 78.4 80. 1 78o 3 5© 9 lo 7 780 3 5© 9 1.7 4 128 H 62o 3 79. 9 77. 1 79o 7 79o 7 6© 5 2. 1 79.7 6o 5 2.1 4 129 R 7 4o 8 74. es 76.0 75c 8 750 4 7© 3 .7 75. 4 70 3 .7 4 130 H 81. 3S 80. 6 79.2 83.8 81,3 8© 6 1.9 8 1 o 3 8© 6X 1.9 4 131 R 79.2 79.7 82o 7 80.7 30. 6 6© 7 lo 5 80 o 6 6© 7 1.5 4

133 A 80.3 81.6 76o 8 85. 4 31. 0 6© 8 3.5 81. 0 6© 8 3.5 4 134 H 80.7 88.7 86.2 79o 3 33, 7 6© 5 4o 5 83.7 6© 5 4. 5X 4 135 I 770 9 87.2 76.6 78.8 30. 1 60 2 4o 8 80 o 1 6© 2 4. ex 4 136 H 81.4 8 1 o 0 79. 9 82o 4 81. 2 5© 5 lo 0 81. 2 5© 5 loO 4 137 H 73. 1 73o 3 86.0 76.3 77o2 6© 8 6o 1 77. 2 6© 8 6. IX 4

138 H 86o as 8 1 o 0 83. 2 82. 6 83. 4 8© 5 2o 4 83. 4 80 5X 2.4 4 139 R 880 6 88. 8 90. 3X 87.9 88, 9X 6© 9 1.0 880 9X 6© 9 l o 0 4 140 H 7 2© 9 70 o ex 73.2 73 0 1 720 5 5©0 lo 1 72. 5* 5© 0 1. 1 4 141 M 77.8 75. 8 77.2 77o 9 77. 2 6© 3 loO 77 o 2 60 3 1.0 4 142 A 73 0 4 74 0 3 72. 8 72.3 73, 2 60 6 o 9 73o 2* 6© 6 .9 4

143 H 79.6 790 6 6© 8 79o 6 60 8 1 145 H 80 o e 83. 1 78.0 76.7 79.7 5© 4 2o9 79 0 7 5© 4 2.9 4 147 H 80o0 79. 1 83.4 7 9o 6 30o 5 7© 9 2. 0 80.5 7© 9 2.0 4 149 H 88. 5 85.2 83.5 84.2 850 4 60 8 2.2 850 4 6© 8 2.2 4 151 H 78.0 75.7 77.0 76.6 76o 8 5©0 lo 0 76o 8 5©0 1.0 4

153 H 82o 7S 84. 4 84 0 5 82.3 83o 5 90 3 lo 2 83o 5 90 3X 1.2 4 155 H 79o 4 79o 3 80o 8 79 0 8 79o 9 6© 1 .7 790 9 60 1 .7 4 157 X 83.2 82.2 81o8 80.5 81o 9 60 2 lo 1 8 1 o 9 60 2 1. 1 4

161 X 78.5 79o 2 83. 1 83o 3 81 o 0 7© 0 2o 5 8 1 o 0 7© 0 2.5 4 163 H 79.0 79o 8 77.8 77o 3 780 5 6© 7 lo 1 780 5 60 7 1. 1 4

165 R 78.7 82. 1 80.4 83.3 31. 2 6© 1 2o0 8 1 o 2 6© 1 2.0 4 166 H 78.6 76.9 78.3 77. 9 5© 6 .9 77.9 5© 6 .9 3 167 H 79.8 78o 0 77.5 76. 4 77.9 5© 8 1 o 4 77. 9 5o 8 1.4 4 169 I 81. 1 8 1.6 83. 1 80 o 7 81, 6 5© 5 lo 1 81o 6 50 5 1. 1 4 171 H 76.0 eioO 82.5 8 1.9 800 3 7© 7 3.0 80o 3 7© 7 3.0 4

172 H 81.9 74.9 78. 0 76.0 770 7 6© 6 3. 1 77o 7 6© 6 3. 1 4 173 H 620 2 79.4 81.2 82o 5 81. 3 4© 8 1. 4 8 1 o 3 40 8 1.4 4 174 H 83.4 81.7 81.4 81.9 32, 1 6© 1 .9 82o 1 6© 1 .9 4 175 H 83.4 81.7 84. 4 79o 1 82. 2 6© 4 2.3 82o 2 6© 4 2.3 4 176 H 78.9 78.5 81.9 79.8 79o 8 6© 4 1.5 79o 8 60 4 1.5 4

8
LINERBOARD 26K1 COLLABORATIVE REFERENCE PROGRAM

REPORT N60 121 BURSTING STRENGTH (MULLBN), PSI

OCTOBER 1979

LAB MEANS THIS MONTH THIS MONTH CUMULATIVE

C0DE V RE-1 WK-2 WK-3 WK-4 KEAN SDR SDWKS MEAN SDR SDWKS WKS

177 H 73.4 74.0 72.6 74.5 73. 6 5.6 © 6 73o 6* 5.6 .8 4 162 H SOo 1 81.2 86.4 84.9 83. 2 6.4 3o 0 83o 2 6.4 3.0 4 184 H 830 6 80.0 81.9 80.7 81 o 6 6.5 1.6 81.6 6o 5 1.6 4 166 I 78.9 83. 2 78.2 76.9 790 3 5. 3 2.7 790 3 5o 3 2.7 4 188 I 8C.9 79.6 79.3 80. 1 SOo 0 5.4 .7 80 o 0 50 4 .7 4

198 R 8 1.3 81. 1 82.4 8 3. 3 82. 0 6.6 1.0 82.0 6. 6 1.0 4 250 L 71.4 70.3X 70. 9X 5.5 .3 70o 9X 5o 5 . 8 2 274 H 74.3 74.0 73.5 73.6 73o 9 6.2 .4 73. 9* 60 2 .4 4 283 H 80o 0 82.3 83.5 81.4 31 0 8 6.7 1.5 8 1 o 8 6.7 1.5 4 287 A 88.7 85.7 86. 7S 90. 7X 880 OX 6.7 2.2 co ©o o* 6o 7 2.2 4

350 H 7e0 7 79.3 77.8 81.8 790 4 5o 6 1.7 79o 4 5. 6 1.7 4 553 M 790 3S 83. 1 83.8 86.4 33. 2 7. 8 2c 9 83© 2 70 8 2.9 4 562 A 82.0 86.4 86.2 85.0 84. 9 7.5 2.0 84© 9 7.5 2.0 4 568 I 790 6 77. 8 77.0 78.2 780 2 7.1 1. 1 78® 2 7. 1 1. 1 4 569 A 79.5 85.5 84.9 81.6 32. 9 5.9 2.3 82© 9 5.9 2.8 4

658 H 84.3 83. 8 81.2 78.2 81. 9 5.6 2.8 81© 9 5.6 2. 8 4 682 X 75. 1 77.8 76.2 76.0 76.3 5.7 1. 1 76© 3 5.7 1. 1 4 701 H 78.8 84.3 83. 1 80.7 81. 7 7.9 2.5 8 1 © 7 7.9 2.5 4

WK-1 WK-2 WK-3 WK-4 THIS GRAND

MONTH AVERAGES CUMULATIVE 4 WEEKS

AV MEAN 79© 7 80.5 80® 1 80© 2 AV MEAN 80o 1 80s 1 AV SDR 6© 1 6.2 6® 4 6© 5 AV SDR 6.3 6.3

SD LABS 3© 9 3.7 3® 8 3© 5 SD LABS 3.7 3.7

N0O INCL 68 67 68 66 N0© INCL 67o 2 67.2

NO. OMIT 4 5 4 4 AV SDWKS lo9 1.7 NOT RCD 1 1 1 3 SD CUM MEAN 3. 1

9
CORRUGo MEDIUM 26D2 COLLABORATIVE reference program

REPORT N00 121 FLAT CRUSH STRENGTH (CONCORA), LB

OCTOBER

LAB MEANS THIS MONTH CODE V WK-1 WK-2 WK-3 WK-4

100 77©7 72,9 72.6 72.6

102 72© 4 73.2 71.5 72© 5 105 72©3 73. 3S 72.6 71.8

106 74© 3 73.2 72.9 72o 0 110 7 3© 9 73.4 75.5 75.8

113 71©4 71.6 70,9 71.7

114 69© 2 72.0 71.0 69o 8 115 76© 2 72. 1 72.6 73© 1 119 69© 1 71.7 66.3 75.0

120 69© 2 69.9 68.3 70. 1

125 80o 3X 80, OX 82. OX 84 0 2X

128 720 5 72,4 72.0 71.4

136 71.6 74,0

138 77,9 76.3 77.2 76.9

140 72,6 72.6 73.7 73.8

143 74,

72. 5

151 71,3 73,3 71.9 73.4

161 66© OXS 79. 8X 79. 5X 71.4

164 67,3 70o l 69.4 71.6

167 72,3 760 0 74. 1 74.3

177 71,2 71.8 73.2 7 0© 3 182 73©7 71.2 72.9 72.6

188 72,8 70.5 70.7 69© 9 198 75© 2 74.3 7 4o 3 72.0

237 7 2© 6 74. 5S 72. 1 730 2 250 69,7 69.8

269 74,4 73,8 72.5 74© 6 274 72,2 72.5 73.3 72© 9 283 72,3 73.2 72o9 74©7

284 71,7 71.5 . 69.6 68.6

287 72,6 73©0 74.3 76© 2S 289 56, 3X 67. 2X 52. 9X 59, 2X 292 7 lo 7 69,6 70.4 71.0

350 87, 4X 87. 7X 84. 3X 860 3X

351 68o 5 70.5 72. 0 72.4

353 740 3 76.3 79 0 5X 355 71,7 73. 5 71.9 73. 1 357 73,9 74© 7 74.6

361 70,7 69.9 71.8 363 66,4 68. 8 69.4 71,2

365 68, 1 70© 0 69.3 70© 6 367 74. 6 75.4 73© 5 369 73,1 70.6 73. 1 72.4

377 75,3 75. 3S 74. 1 75.9

379 74,9 73.4 74.0 73o 9

381 71.9 74. 8 72.0 73.7

383 72,9 74.5 75.5 78.5X

385 74.0 71.9 74.7 68.8

387 72.5 71.8 73. 1 72© 1 391 70, 1 68© 8 75.0 7 4© 6S 393 72,4 74.2 73o 6 740 7 395 72,9 73. 9 75.2 74.2

397 7 2© 8 74. 0 70.5 7 1 o 3 399 69. 1 73.3 69.7 72.2

553 69© 4 75.2 72. 2 71.1

THIS MONTH CUMULATIVE

MEAN SDR SDWKS MEAN SDR SDWKS

740 0 4© 3 2.5 73o 6 4© 4 1.4

72o 4 2.8 .7 72.0 2© 9 ©9

72, 5 4.4 o 6 75o 0 4© 2 3.0

73, 1 3.8 1©0 730 3 3© 7 .7

740 7 4c 1 1.2 73© 3 3.9 1.3 71.4 2.4 o 4 71 0 4 2,7 .4

70, 5 2. 1 lo 3 70o 6 2© 6 .9

730 5 4© 3 lo 9 740 2 4©0 1.7

71© 0 4© 0 3o 0 69© 9 3o 8 2.1

69o 4 3© 3 ©3 69© 8 3o3 1.2

ai 0 6X 4© 2 lo 9 80© 2X 4© 7 2.4

72o 1 3© 3 .5 72© 6 3© 2 .9

72. 8 4,0 1.7 73o 4 4.2 2.1

77. 1 3,9 ©7 75© 7 4.2 1.5 730 2 4.3 .7 75. 5 4© 2 2.2 73,3 3.9 loO 72© 8 3© 1 .7

72.5 3© 5 1,0 70.5 3o 9 2.9

79o 2X 5,0 6o 0 73.9 4.7 4.5X

69© 6 2o 8 lo 8 68o 6* 3© 4 2.7

740 2 3© 0 1 © 5 73o 2 3o 8 1© 4

71o 6 3,3 1.2 70.7 3o 5 1.4

72. 6 4. 0 loO 77. 2* 4© 1 3.5

7 lo 0 3. 4 1,3 71, 5 3o 2 1.1

74© 0 4. 0 1.4 71o 8 4© 1 3.5

73, 1 5© 2 1,0 72© 7 4,3 1.3

690 8 2© 9 o 1 71 0 0 2© 5 1.2

73© 8 3o 7 ©9 72. 8 30 7 1©3

72© 7 3© 3 ©5 720 9 3© 0 ©4

73© 3 2,6 loO 73.0 3.0 1.9

70o 4 40 0 1,5 690 3 3o 7 2© 8

74© 1 40 3 1© 6 74o 3 4© 1 1.7

58. 9 X 2o 3 6© 1 59o 6X 3© 1 7. OX

70, 7 2© 8 ©9 68o 4* 3, 1 2,7

86© 4X 4.7 lo 5 85. 2X 4© 8 1.9

70o 9 2© 2 lo 8 71© 8 2©4 1.2

760 7 3o 6 2o 6 73o 4 3. 8 2© 7 720 6 3© 5 ©9 73© 1 3.3 2. 1 74. 4 3. 8 o 4 74o 4 4o 0 1.4

70© 8 3© 1 1©0 70© 9 3.4 1.6

69© 0 3© 5 2© 0 69o 0 3.7 1.9

690 5 3© 4 1© 1 69© 7 3© 3 2.0 74,6 3,7 l o 0 74. 3 4© 1 2.0

72© 3 30 2 lo 2 72© 6 3© 3 .8

75o 2 4©7 ©8 75.5 4.2 1.3

74o 1 3o 9 o 6 73o 9 4.0 1.2

73. 1 3.2 1.4 71. 9 3.4 1.4

75© 4 3. 0 2.4 75. 0 3© 5 3.7

72, 4 4.4 2.7 73. 1 4.8 3.1

72© 4 4© 0 © 6 73o 5 3.7 1.7 720 1 3, 8 3, 1 70 o 1 3© 4 3.0

730 8 4.2 lo 0 73. 8 3©9 2.4

74© l 3© 6 © 9 73© 5 3.7 1. 1 720 2 4.3 lo 6 73© 6 4. 1 1.7

71 0 1 4. 0 2© 0 730 7 4,0 2.8

72© 0 3o 0 2,5 71.7 3o 0 2.2

1979

WKS

16

1416

1615

16

1616

1415

16166

16

16

9

1 1 1612

16

1416

16

612

12

16

16

1516

16

15

16

1416

1516

13

14

16

1613

16

16

1 5

1516

1616

16

1616

1614

16

10
CORRUG. MEDIUM 26D2 COLLABORATIVE reference program

REPORT NO* 121 FLAT tlRUSB STRENGTH (CONCORA), LB

OCTOBER 1979

LAB MEANS THIS MONTH THIS MONTH CUMULATIVE

CODE V WX-1 WK-2 WK-3 WK-4 MEAN SDR SDWKS MEAN SDR SDWKS WKS

555 74,2 74.8 74.8 73.7 74.4 2© 1 o5 74.2 2.4 1.5 16 56 2 72.4 71.6 73.6 71.3 72. 3 3.5 1.0 71. 8 3.9 1.6 16 565 70o 0 65. IX 70.7 76.6 70.6 3.4 4.7 690 5 3o 3 3.5 16 572 72.4 740 5 73.9 72.2 73, 3 3.9 lo 1 73.7 3.9 2.4 15 578 77© 9 74.7 72.0 74. 5S 740 8 4.4 2.4 70.6 4.2 8.5X 16 609 78.2 75.8 76.4 76.2 76.6 3.5 1. 1 75. 9 3.6 2.0 16 617 77.0 76. 6S 75. 6S 67.9S 74© 3 6.6 4.3 77o 2* 6.2X 4. IX 16

WK-1 WK-2 WK-3 WK-4 THIS GRAND MONTH

AVERAGES CUMULATIVE 16 WEEKS

AV MEAN 72*5 72* 3 72© 7 72.6 AV MEAN 72.7 72.6

AV SDR 3© 6 3© 5 3© 6 3o 4 AV SDR 3.5 3.6

SD LABS 2© 6 2.0 2© X 2©1 SD LABS 2.2 2.4

N60 XNCL 56 55 5to 53 NOo INCL 55o 0 53.0

NO. OMIT 4 5 4 5 AV SDWKS 1.6 l.S NOT RCD 2 2 2 4 SD CUM MEAN 2.1

SD SETTS 2o 0 2*2 2.0 2© 3

11
NBS-114A (REV. 9-78) 2.Gov*tAccession

lin'i I i„.

U.S. DEPT. OF COMM. BIBLIOGRAPHIC DATA

SHEET

1. PUBLICATION OR REPORT NO.

FKB.G CRP 121

4. TITLE AND SUBTITLE

CONTAINERBOARD

Collaborative Reference Program for Containerboard

Report No. 121

3. fteciptenfs Accmicn No.

5. Publication Date November 30, 1979

jf| Performing Organization Cods

7. AUTHOR(S)

T.L. Cummings, J. Horlick

8. Performing Organ. Report No. NBSIR 79-1816

9. PERFORMING ORGANIZATION NAME AND ADDRESS

NATIONAL BUREAU OF STANDARDS

DEPARTMENT OF COMMERCE

WASHINGTON, DC 20234

10. Project/Task/Work Unit No.

11. Contract/Grant No.

12. SPONSORING ORGANIZATION NAME AND COMPLETE ADDRESS fSfreer, city, Stete, zip)

Collaborative Testing Services, Inc.

9241 Wood Glade Drive, Great Falls, VA 22066

and American Paper Institute/Fourdrinier Kraft Board Group

13. Type of Report & Period Covered

FINAL

14. SpWfsortngAgency Gode

15. SUPPLEMENTARY NOTES

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

16. ABSTRACT (A 200-word or teas factual summary of moat 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 aemicolona)

Collaborative reference program; Containerboard; Laboratory evaluation;

Precision; Reference samples; Testing calibration

18. AVAILABILITY | \ Unlimited

IY1 For Official Distribution. Do Not Release to NTIS

I 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

15

22. Price

USCOMM-DC

3