CONTAINER

BOARD

report no. 115

April 1979

NBS Collaborative' Reference Fourd rinieri Kraft Board Group

Program for Containerboard American Paper Institute, Inc. and 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

A05 Technology Building

National Bureau of Standards

Washington, DC 20234

Rev. 3/79
CONTAINER

BOARD

Collaborative Reference

Program for

Containerboard

report no. 115

April 1979

J. Horlick

Office of Testing Laboratory

Evaluation Technology,

Office of Engineering Standards,

National Engineering Laboratory

T.L. Cummings

NBS Research Associate

Collaborative Testing

Services, Inc.

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

National Bureau of Standards American Paper Institute, Inc.

NBSIR 79-1376

Introduction

The Collaborative Reference Program for Containerboard is sponsored

by the Fourdrinier Kraft Board Group (FKBG) of the American Institute

of Paper, Inc., with the cooperation of the Technical Association of

the Pulp and Paper Industry (TAPPI) and the Collaborative Testing

Services, Inc. In this program, samples of three weights of linerboard, nominally 26 lb, 42 lb, and 69 lb and of corrugating medium

(26 lb) are randomized separately from uniform narrow rolls and

packaged for distribution to the participants. Each month, sufficient

test material for four weekly tests, the material for each consisting

of 20 test pieces of 42 lb board and 20 test pieces of 26 or 69 lb

board, the latter in alternate months, is mailed to participants for

Mullen bursting strength, or for each week five sheets of corrugating

medium, each sheet for four tests of Concora flat crush strength.

The participants return their test results to NBS for analysis and

receive two monthly reports from NBS: a "preliminary'' (individualized

report) comparing a laboratory's results with the industrial mean,

and a longer report (as illustrated by this report) showing the data

from all participants.

Jeffrey Horlick, Administrator

Collaborative Reference Programs

Office of Testing Laboratory

Evaluation Technology

(301) 921-2946

June 4. 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 42H11, weeks 1-4

8 Bursting Strength, Linerboard 26G4, weeks 1-4

10 Concora Flat Crush, Corrugating Medium 26D1

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 "X" 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 WX>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, net 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 inaex 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 amongsheet 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 the indicated number of weeks , including the four

weeks of the 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 MF.AN 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

INSTRUMENT CODES

FOR

MULLEN BURST TESTERS

(Column V)

Code Description

A Model A, Manual Clamp

H Model AH, Hydraulic Clamp

I Model A, Hydraulic Clamp added

J Jumbo, Hand Clamp, Hand Driven

L Lhomargy, Hydraulic Clamp

M Model AH, Hydraulic Clamp, Transducer

R Model A, Air Clamp added

X Other Model, Please Describe Instrument

Make and Model

If an incorrect instrument code has been assigned to your laboratory,

please inform us.

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 third 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 ,

J

October 1976 -

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 September 1978 -

5
LX NERB6 ARD 42H1 1 COLLABORATIVE REFERENCE PROGRAM APRIL 1979 REPORT NO. 115 BURSTING STRENGTH (MULLEN). PSI LAB MEANS THIS MONTH

CODE V WK-l WK-2 RK-3 WK-4

100 H 125.8 123.5 126.4 125.5

101 H 123. 2 123. 1 122.6 122.3

102 H 125. 1 128.7 125.4 126.7

103 I 1 16.3 115.3 116.1 115.7

105 M 1 19.9S 1 19.7 124.2 1 19.0

106 H 132. 1 136. 3X 134. 6X 128. 6S

108 M 126.8 132.4 128.7 127.2

109 H 123.7 128.0 129.9 124.7

110 M 128.7 125. 2 123.9 128.8

1 1 1 M 124.3 124.4 123.8 1 19. OS

112 H 1 14. 2 117.8 1 17.5 1 17.3

113 R 124.9 126.5 124.9 126. 1 114 A 125.4 125.3 127.3 125.2

115 R 123.5 125.0 124.6 123.1

117 H 123.7 121.9 123.5

119 H 126. 1 127. 2 125.7

120 R 1 15.9 120. 1 123.7 1 19.5

121 M 121.6 130.8 123.9 131.2

123 R 121.4 103. IX 133. 1 125 I 129.3 123.9 123.5 123.2

127 H 126.7 126.0 125.9 122.6

126 H 128.8 126. 0 125.2 124.5

129 R 117.o 122. 4S 126.6 131.3

130 H 125.9 126. 6S 123.5 123.8

131 R 122. 6S 128. 4S 129.3 1 18.3

133 A 118.5 124.7 124.7 125.2

134 H 120.5 123.8

135 I 135.2 128.6 132.7 126. 8 137 H 121. 2S 124. IS 1 19.3 123. 3S

138 H 132.2 129. 1 127.9 126.3

139 R 125.5 124.7 1 19.2 1 14.4

140 H 123.4 121.7 122. 1 123. 8

14 1 H 118. 4S 118.6 1 17.9 118.2

142 A 123. 4 124.9 124.9 127. 1 143 H 124.6 125.2 125.3 125.9

145 H 1 16. 5 123. 2 120.6

147 H 125.7 129. 6 123. 1 125.0

149 H 128.0 130.7 132.0 132.6

151 H 123.6 125.0 123.5 122.4

153 H 131.0 127.6 129.5

155 H 120.0 131.3 128. 1 126.6

157 X 122.7 117.1 124.6 127.1

161 X 121.7 124. 4 128.7 131.1

163 H 128.4 121.2 121.9

165 R 125.6 124.9 125. 1 123.8

166 H 117.8 1 19. 5 122.5 120.2

167 H 127. 1 125. 1 123.9 124.3

171 H 124.6 122.7 122.4 120.5

172 H 122.S 124.5 120. 7 130.8

173 H 124. 1 124. 2 123.5 122.5

174 H 123.5 127. 1 121.9 124.4

175 H 118.4 120.3 120.0 1 17.9

176 H 128. 8 122. 1 122.6 129.6

177 H 120. 1 121.7 121 .

120.5

182 H 126. 5 125.2 127. 1 124.7

THIS MONTH CUMULATIVE

MEAN SDR SDWKS MEAN SDR SDWKS WKS

125.3 8.3 1.3 125.2 8.7 1.0 6 122. 8 6.5 .4 120.5 7.5 3.5 6 126. 5 a.-’ 1.6 125. 1 8. 0 2.7 6

1 15* 9 7.7 .4 116.2* 7.6 .7 6 120. 7 10.2 2.4 123. 3 9.8 4.7 6

132. 9X 12.3 3.4 133. 7X 11.7 2.8 6 128. a 9.5 2.5 129.4 8.7 2.2 6 126.6 10.0 2.9 126. 0 10.2 2.5 6

126. 7 8.9 2.5 127. 1 9.3 2.0 6 122. 9 12. 0 2.6 123. 5 11.0 2.5 6

116. 7 1 0. 5 1.7 118. 3 1 0.3 3.4 6 125. 6 7.2 .8 125. 0 7.8 1.5 6 125. 8 9.2 1.0 125. 8 9.6 1.0 6 124. 1 8.4 .9 123.9 8. 1 .8 6 123. 1 6.6 1.0 122. 2 7.5 3.3 5

126. 3 8.3 .8 128. 8 9.0 3.5 5

1 19. 8 8.4 3.2 119.2 8.5 3.7 6 126. 9 9.1 4.9 127.9 8.9 4.5 6 119.2 8.6 15. 1 1 13. 5X 8.6 13. 2X 5 125. 0 8.4 2.9 125. 0 8.7 2.5 6

125. 3 6.9 1.8 125. 9 7. 0 1.9 6 126. 1 9.0 1.9 124.9 9.6 2.5 6 124. 5 6.4 5.8 125. 0 6. 8 5. 1 5 125. 0 10.5 1.5 125. 5 10.5 3.7 6 124. 7 12. 8 5.2 122. 0 12. 0 5. 8 6

123. 3 8.3 3.2 123. 6 8. 1 2.5 6

1 22. 2 8.3 2.4 122.2 8.3 2.4 2 130. 8 1 0.3 3. 8 131.2* 1 0.6 3.3 6

122. 0 12.9 2.2 122. 8 12. 1 2.5 6 128. 9 10. 2 2.5 128. 2 10.4 2.2 6

121. 0 9.5 5.2 121.0 9.3 4.2 6 122.8 7.4 1.0 120.7 7.2 3. 5 6

1 18. 3 5.6 .3 118.5 6.4 .4 6

125. 1 8. 5 1.5 124. 9 8.4 1.4 6 125.3 9.8 .5 125. 3 9.7 1. 1 6

120. 1 7.5 3.4 120. 1 7. 1 2.8 4 125. 9 9.9 2.7 127. 4 9.5 3. 1 6 130. 8 10.2 2.0 129. 7 1 0. 7 2.5 6 123. 6 6.6 1. 1 1 24. 3 6.9 1.4 6 129. 4 1 0.3 1.7 129. 4 1 0o 3 1.7 3 126.5 11.5 4.8 128. 2 11.1 4.6 6 122.9 7.4 4.3 120.9 7.2 4.6 6 126. 5 7.2 4.2 126. 6 7. 1 3. 3 6 123.9 8.3 3.9 123. 6 8.2 3.0 5 124. 9 7.9 .8 125. 1 8.4 .8 6

120. 0 7. S 1.9 120. 0 7.5 1.9 4 125. 1 9.0 1.4 125. 1 8.7 1. 1 6 122. 6 8.9 1.7 122. 6 9.2 1.3 6

124. 6 9.7 4.4 126. 8 1 0. 3 5.0 6 123. 6 7.4 . 8 123. 8 8. 0 1.3 6 124.2 9.3 2.2 124. 5 9.7 2.4 6 119.2 7.4 1.2 117. 4* 8.6 3.2 6 125.8 10.9 4.0 126.3 10.2 3.6 6

1 20. 9 8.6 .7 120. 8 9. 1 .6 6

125. 9 10.4 1.1 125. 5 10.0 1.0 6

6
LINERBOARD 42H1 1 COLLAEOR ATI VE REFERENCE PROGRAM REPORT NO. 115 BURSTING STRENGTH (MULLEN). PSI

APRIL 1979

LAB MEANS THIS MONTH

CODE V WK-1 WK-2 WK-3 WK-4

184 H 125.4 121.8 1 17.3 118.9

186 I 121.8 121.9 121.4 121.6

188 I 117.6 115.2 1 1 1.5X 1 13.5

250 L 143. 8X 146. 5X 142. OX

274 H 121.9 122.6 122. 6 122.9

283 H 130. 1 119.5 1 19.5 287 A 132.7 133. 2 132. 5 125.6

327 M 127.9 125.7 127.6 128.7

350 H 122.7 121.7 123.3 127. 4 553 M 126.9 126.2 129.3 130.3

562 A 132.6 135. 7X 142. 6X 131.2

56 8 I 117.2 119.0 120.0 125. 1 569 A 121.4 121.7 121.1 120.2

658 H 1 18.8S 118. 6S 1 16.9 1 17.8

THIS MONTH CUMULATIVE

MEAN SDR SDWKS MEAN SDR SDWKS

120. 9 8.4 3.5 122. 4 8.5 4.6

121. 7 8. 1 .2 121.

8

7.5 .8

1 14. 4X 5. 8 2.6 1 16. 4* 6.3 3.6

144. IX 11.6 2.3 141. 2X 12.3 5.1

122. 5 6.6 .4 122. 0 6.9 .9

123. 0 8.3 6. 1 123. 1 8. 1 4.4

131. 0 9.2 3.6 129. 1 9.2 5.3

127. 5 9.7 1.3 126. 5 9.4 2.4

123. 8 9.5 2.5 122.9 10.0 2.5

128. 2 7.5 1.9 126. 6 7.5 3.3

135. 6X 9.3 5. 1 134. 2X 9.4 4.5

120.3 1 0.4 3.4 120. 5 1 0.4 3.2

121. 1 8. 1 .6 121.9 8.4 2.8

1 18. 1 3. 1 .9 1 16. 3«- 4.5X 4.8

WKS

5

6

6

5

5

66

6

6

66

6

GRAND AVERAGES

WK-1 WK-2 WK-3 WK-4 THIS MONTH CUMULATIVE 6 WEEKS

AV MEAN 124. 1 124.2 124.0 124. 1 AV MEAN 124. 1 124.2

AV SDR 8. 8 8.7 8.9 8.3 AV SDR 8.7 8.8

SD LABS 4. 6 3.9 3.7 4.5 SD LABS 4.2 4.4

NO. INCL 65 59 61 64 NO. INCL 62. 2 6 1.7

NO. OMIT 3 5 6 3 AV SDWKS 2. 5 2.7

NOT RCD 1 5 2 2 SD CUM MEAN 3.5

7

O'

tn
LINERBAARD 26G4

LAB CADE

100

101 102

103 105

106 108

109

1 1 0

1 1 1

112

113

1 1 4 115

l 1 7

119

120

121 123

125

127

128

129

130

131

133

134 135

137

138

139 140

14 1 142 143

145

147 149

151 153

155

157

161 163

165

166 167

171 172

173

174

175

176 177 182

COLLABORATIVE REFERENCE PROGRAM APRIL 1979 REPART NA. 115 BURSTING STRENGTH (MULLEN), PSI MEANS THIS MANTH THIS MANTH CUMULATIVE

V Wg-1 WK-2 WK-3 WK-4 MEAN SDR SDWKS MEAN SDR SDWKS WKS

H 75,6 71.7 74.2 73.3 73. 7 6.8 1.6 73. 5 6.6 1.3 12

H 73,3 73. 8 74.4 74.2 73.9 7.4 .5 73.7 7.9 .8 8 H 72,8 73.7 72.7 73.6 73. 2 5. 8 .5 72.7 5.4 1.0 12

I 71,0 65. 1 66. 4X 68. OX 67. 7 5.9 2.5 71.6 5.9 3.4 12

M 70.5 72. 8 73. 8S 73.4 72.7 7.9 1.5 72. 3 9. 0 2.6 12

H 76,0 78.9 69. 6S 75.2 74.9 9.5 3.9 75.3 8. 1 2.9 1 1 M 76.3 61.3 77.3 76.7 77.9 7.4 2.3 76. 2 7.9 2.4 1 1 H 73.9 75.5 71.5 74. 8 73.9 7.6 1.7 73. 2 7. 1 1.3 12

M 79.2 76.3 77.0 76. 1 77.2 7.3 1.4 76.7 7.9 2.0 12

M 74. 5 71.7 72.6 72.5 72. 8 6. 8 1.2 72. 1 7.3 2.9 12

H 64. OX 65.9 68.3 67. OX 66. 3 X 7.9 1.8 67.7* 7.3 2.2 12 R 73.7 73.9 74.3 74.5 74. 1 7.2 .4 74. 4 5.6 .4 12 A 77.1 74.0 76. 1 73. 8 75. 3 7.6 1.6 75. 8 6.2 1.8 12

R 77.9 77.4 78.4 77.1 77.7 4.7 .6 75. 6 4.6 2. 1 12

H 73.7 71.5 74.5 73. 3 6.4 1.5 73. 3 5.6 1.6 1 1

H 67. 5S 72. 1 73.0 70. 9 8.3 2.9 72. 9 8. 1 4.0 10

R 69.9 70.3 69.8 70.8 70.2 8.3 .4 70. 8 7.8 2.3 12

M 76.0 79. 1 76.2 78.9 77.6 6.3 1.7 77.9 7.4 2.2 12

P 72.7 69.9 75.0 72.6 6. 8 2.6 75.3 7.6 2.6 1 1 I 79.9 80.7 77.8 77.5 79. 0 6. 0 1.6 79.6* 5.7 1.4 12

H 75.0 73.4 74.2 73.4 74. 0 4.7 .8 74. 3 4.7 .9 12

H 74,6 73. 1 71.9 75.7 73. 8 6.4 1.7 74. 5 7.8 2.0 12

R 78.5 74.7S 77.0 74.3 76. 1 6.5 2.0 75. 8 5. 6 2.7 12

H 68.9 74.0 72.4 70.5 71.5 7.9 2.2 72.4 8.5 2.2 1 2

R 73.9 69.4 75.0 62. 8X 70. 3 8.4 5.5 68. 0* 8.6 3.9 12

A 77. 1 72.6 79.8 77.2 76. 7 7.2 3.0 76. 2 6.5 1.8 12

H 72.5 75.6 74.0 7.9 2.2 74. 0 7.9 2.2 2

I 81.0 81.0 82. 7X 77.0 80. 5X 6. 8 2.4 80. 5* 6. 8 2.4 4

H 67. 8 66. 8 69.4 67. 8X 68. 0 8. 1 1.1 68. 5* 6. 8 1. 1 12

H 74.4 75.2 72.6 74.7 74.2 8.5 1. 1 72.4 8.2 2.6 12

R 72.3 73.6 73. 9S 73.8 73. 4 6. 0 .8 74. 0 7.8 2.6 12

H 72.3 71.8 70.9 71.2 71.6 5. 1 .6 69. 3 4. OX 1.9 12 H 71.1 71.3 72.0 72. 1 71.6 5.7 .5 72. 6 5.5 1. 1 1 1 A 68.2 71.2 70.0 72. 5 70. 5 8.2 1.8 69. 8 7.6 2.0 1 2 H 72.7 73. 1 73.4 73.4 73. 2 7.0 .3 73. 3 7.6 .5 12

H 66.9 74. 9S 75.5 72. 5 7.9 4.8 73. 5 7. 0 2.7 9

H 76.4 75. 1 73.0 71.6 74. 0 7.3 2. 1 74. 8 7.8 1.8 12

H 76. 1 77.3 76.5 76.8 76.7 6.9 .5 75. 6 6.4 2.0 12

H 74. 1 75.0 75.3 72.4 74.2 5.0 1.3 74.9 5.7 1.0 1 1 H 77. 1 78.4 77. 5 77.7 7.4 .7 77. 7 7.4 .7 3

H 75.7 74.4 79.4 74.0 75.9 7.4 2.5 74. 1 6.7 3.0 12 X 77.9 75.5 77.4 74.1 76. 2 8.4 1.8 74. 4 7.8 3.4 12 X 76.5 68.9 74.9 73.2 73. 4 7.9 3.3 74. 4 7.9 2.5 12

H 77.2 75.8 75.5 76. 2 7.8 .9 75. 7 6.7 1. 1 10

R 74.0 78.9 74.5 73. 1 75. 1 7.0 2.6 74.3 7.2 1.8 1 2

H 72.9 74. 5 72.6 74.9 73. 7 7.2 1. 1 76. 0 7. 0 4.0 7

H 75.5 73. 9 69.9 70.4 72. 4 7.6 2.7 72. 8 6. 8 2.5 12

H 74. 1 70. 1 71.0 73.3 72. 2 6. 1 1.9 73. 2 7.5 1.7 12 H 71.7 76. 4 75.5 79.3 75.7 8.4 3. 1 74.7 7.4 2.9 12

H 65.5 67. 9 70.8 70.9 6 8. 8 7.2 2.6 71.9 6.9 3.6 1 1

U 71. 1 70. 9 72. 8 74.0 72. 2 7.6 1.5 75. 1 7.2 3.4 12

H 68. 1 69.6 75.4 68.9 70. 5 7.9 3. 3 76. 5 7.9 6.8X 1 0 H 73.4 73.5 73.6 72.5 73. 3 8.4 .5 74. 2 7.4 1.9 12

H 70.3 67. 7 74.9 74.2 71.8 7. 8 3.4 72. 5 7.3 2.7 1 1 H 74.6 75.5 75. 8S 76.0 75. 5 8.5 .6 76. 1 8.4 1.0 8

8
LINERBGARD 26G4 COLLABORATIVE REFERENCE PROGRAM

REPflRT NO. 115

BURSTING STRENGTH (MULLEN). PSI

APRIL 1979

LAB MEANS THIS MG NTH THIS M0NTH CUMULATIVE

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

184 H 72.7 75.6 69.2 70.2 71.9 7.3 2.8 76. 2 6.9 4.3X 1 1 186 I 73. 1 74.8 75.0 74.3 74. 3 6. 0 .9 73.9 6.4 .9 12 188 I 73.7 74. 8 74.9 72.7 74. 1 5. 6 1.0 74. 1 6. 1 1.3 12 250 L 82.3 87. 1 X 79.0 82. 8X 7.5 4. 1 83. 3X 7.2 2.4 1 1 274 H 74.0 74.3 74.0 74.7 74.3 5.0 .3 74. 1 5.7 .6 12

283 H 76.6 74. 8 75. 0 75. 5 7.8 1.0 76. 4 6.4 2.4 1 1 287 A 78.6 72.9 78. OS 77. 1 76. 7 8. 8 2.6 76. 8 8.7 2.4 12 327 M 78.6 77.9 79. 1 74.8 77.6 6.5 1.9 76. 1 8.3 3.5 1 2 350 H 67.5 73. 8 71.1 75.2 71.9 8.5 3.4 71.0 7.5 2.2 12 553 M 78.6 76.4 74.3 76.9 76.6 5.4 1.8 75. 4 5.5 2.3 10

562 A 81.9 81.3 79.7 81 ,3X 81. IX 9.4 .9 79. 7* 9. 1 1.8 12 568 I 66.9 69.6 71.8 72.7 70. 3 6. 1 2.6 71.2 6.9 1.9 12 569 A 72.4 72. 1 72.7 72.3 72.4 6. 1 .3 72. 0 5.4 2.0 12 658 H 60. 2X 63. 2X 59.7XS 64. 5X 61. 9X 3.9 2.3 68. 4* 5. 1 5.5X 12

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

GRAND

MONTH

AVERAGES

CUMULATIVE 12 WEEKS

AV MEAN 73. 8 73. 8 74.0 74.2 AV MEAN • o 74.0

AV SDR 7.2 7. 1 6.9 7. 1 AV SDR 7. 1 6.9

SD LABS 3.7 3.6 2.8 2.2 SD LABS 3. 1 3. 1 NG. INCL 63 61 61 58 NG. INCL 60. 7 61.2

N0. GMIT 5 3 6 9 AV SDWKS 1.8 2.1 NGT PCD 1 5 2 2 SD CUM MEAN 2.6

9
C0RRUG. MEDIUM 26D1

LAB C0DE V

100 102

105

106

110

113

114

115

116 119

120 125

128 138

140

143

161 164 167

177

182

188 237

250

269

274 283

284

287

289

292

327

350

35 1 353

355

357

363

365 367

369

377

379

38 1 383

385

387

391 393

395

397

399

553

555

562

C0LLAB0RATIVE REFERENCE PR0GRAM APRIL 1979 REP0RT N0. 115 FLAT CRUSH STRENGTH (C0NC0RA), LB

MEANS THIS MONTH THIS M0NTH CUMULATIVE

WK-1 WK-2 WK-3 WK-4 MEAN SDR SDWKS MEAN SDR SDWKS WKS

75.9 74. 4 74. 8 72.0 74.3 4.3 :.6 73. 9 3.6 1.3 16 72.3 72.2 73. 1 72. 6 3.3 .5 73.6 3.4 2.0 15 72. 1 73.2 70.6 74.0 72. 5 3.8 1.5 75.5 4.2 3.9X 16 72. 1 72. 5 73.0 72. 8 72. 6 3.7 .4 73. 2 4. 1 2.2 15 73. 1 73. 4 76.2 75.2 740 5 3. 5 1.5 74. 8 3. 8 1.3 16

73.3 72.4 72.6 72.7 72. 8 3.6 .4 72. 6 3.2 .8 16 71.0 70.6 71.8 71.7 71.3 3. 5 .6 69.9 3.4 1.5 16 74.4 73. 1 71.8 72.3 72.9 4. 1 1. 1 73. 0 3. 8 1.8 16 65. 7X 65.6 68.2 68.5 67.0 4.6 1.6 69. 5* 3.3 2.9 12 70.4 68.7 71.5 70. 2 3. 0 1.4 71.5 3.9 1.8 15

76.5 68. 3 72.8 74.3 73. 0 3.4 3. 5 72.3 3. 5 2.2 16 81. 7X 79.6 81 .9XS 77. 9X 80. 3X 4.3 1.9 78. 7X 4.3 1.9 16 71.8 72.6 72.8 71.7 72.3 3. 1 .5 71.8 3.5 .8 16 77.3 76.5 76.6 75.6 76. 5 3.9 .7 75. 6 4.4 1.5 16 74.2 70.7 73.6 71.3 72. 5 3.6 1.7 72.6 4.0 1.0 16

72.9 73.9 73. 1 73. 1 73. 3 3.2 .4 72. 7 3.7 1.2 16 73.5 71.8 74.7 74.7 73.7 4.0 1.4 73.5 4.3 3.0 15 76.3 76.3 81. 3X 72.0 76. 5 3.7 3. 8 74.6 3.5 2.8 16 72.9 73.0 73.7 73.7 730 3 4.6 .5 73. 5 4.2 1.3 16 71.7 70.9 69.9 70.3 70.7 4.0 .8 71.4 3.9 1.6 16 76.9 79. 7S 78. 2 79.8XS 78. 7X 4.7 1.4 78. 3X 4.7 2.1 16 71.3 72. 8 72.6 73.7 72. 6 3.2 1.0 72.4 3.3 1.6 16 72.7 71.6 72.6 72.3 72. 3 3.0 .5 71.3 3. 1 2.0 16 69.5 68.9 69.5 69.3 2.6 .3 69. 3* 2. 5X .8 1 1 75.6 70.7 70.9 70.8 72. 0 3.2 2.4 71.3 3.5 1.5 16

73.4 73.7 73.4 73.2 73. 4 3.5 .2 72.7 3.5 .6 16 71.8 72.2 71.6 71.9 2.5 .3 72. 2 2.7 .6 12 71.4 71.7 72.0 72.0 71.8 4.0 .3 71.6 3. 8 1. 1 16 78.0 78.0 81. 3X 75.0 78. 1 4.7 2.5 79. 2X 4.5 1.6 16 67.5 64.4XS 64. 3X 62. 9X 64. 8X 2.8 2.0 64. 3X 2.9 2. 1 16

72.9 73. 4 69.5 76. 2 73.0 3. 8 2.8 73. 4 3. 8 3.2 15 71.3 69. 2 68. 8 70.6 70. 0 2. 1 1.2 69. 5* 2. 2 X 1.6 8 77.9 78.4 80. 5X 79. 9X 79. 2X 3.7 1.2 79. 8X 3.7 1.4 16 73. 3 72. 2 72.3 73.0 72. 7 2.3 .5 73. 3 2.3X 1.7 16 74.0 74. 8 74.0 72.7 73. 9 3. 5 .9 73. 2 3.5 1.7 16

75. 1 74. 9 75.0 72.5 74. 4 3.4 1.3 74. 1 3. 5 1.1 16 70.8 67. 1 67.9 68.7 68.6 3.2 1.6 70. 7 3.6 2.5 16 71.2 70. 9 70.2 71.9 71. 1 3.0 .7 70.5 2.9 1.2 16 68.7 67.3 71 .

68.8 69. 0 3.3 1.6 70. 8 3. 5 1.5 16 73.6 76.5 74.7 73.9 74. 7 4.3 1.3 75. 3 4.7 2.1 16

73.4 70.4 71.2 71.6 71.7 3.0 1.3 71.7 3.4 .9 16 72.5 74.3 76.4 73.9 74. 3 4. 1 1.6 75.4 4.3 2.0 1 5 73. 1 72.5 73. 3 72.3 72. 8 4.3 .5 73. 8 4. 1 1.2 16 69.0 70.4 69. 2 69. 5 3. 8 .8 69. 5* 3. 8 .8 3 71.6 71.0 70.6 72.6 71.5 4. 2 .9 74. 2 4.0 2.2 IS 70.5 73. 2S 67. 7

S

66. 5X 69. 5 6.7 3.0 71. 2 4. 9X 2.6 16 72. 1 72.6 71.8 71.9 72. 1 4.2 .3 72. 3 3. 8 1.7 16

7 1.6 63. 8X 72.0 66. IX 68.4 2.9 4. 1 67. 6X 3.6 4. OX 1 1 69.0 67. 7 67. 4 67. 2 67. 8 2.3 .8 71.0 2.8 2.3 16 75.7 75.9 76.2 74.0 75. 4 3.7 1.0 75. 6 4. 0 1. 1 15 73.5 78.4 72.4 75.1 74. 9 3.6 2.6 76. 1 3. 8 2.0 16 73. 5 68. 5 67.0 67.7 69. 2 3.4 2.9 72. 8 3.5 2.9 1 5

7 1.3 72.5 74.6 72.9 72. 8 3.6 1.3 71.0 3. 8 1.5 15 74.7 74.7 75. 1 74.1 74. 7 3.4 .4 75.3 3. 1 2.5 16 72. 1 71.6 71.8 71.6 71. 8 4.2 .2 71.7 4.4 1.8 16

10
C0RRUG. MEDIUM 26DI COLLABORATIVE REFERENCE PROGRAM APRIL 1979

REPORT NO. 115 FLAT CRUSH STRENGTH (C0NC0RA), LB

LAB MEANS THIS! MONTH THIS MONTH CUMULATIVE

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

56 8 73.4 74.8 75.2 75.4 74.7 3.4 .9 75.7 3.6 3.0 16 572 73. 1 74. 4 73.7 3. 3 o 9 72. 2 3.6 1.5 14 57 8 64. 7X 73. 7S 72.2 72. 1 70. 7 4.6 4. 1 74.2 4.5 4.7X 16 609 74. 3 75. 4 77.0 73.2 75.0 3.0 1.6 73.7 3. 3 1.7 16

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

GRAND

MONTH

AVERAGES

CUMULATIVE 16 WEEKS

AV MEAN 72.9 72.9 72.3 72.4 AV MEAN 72.7 73. 1 AV SDR 3.7 3.6 3.5 3.4 AV SDR 3.6 3.6

SD LABS 2.3 3. 1 2.7 2.0 SD LABS 2.5 2.7

NO. INCL 56 54 53 50 NO. INCL 53. 2 53.4

NO. OMIT 3 2 5 6 AV SDWKS 1.3 1.7 NOT RCD 0 3 1 3 SD CUM MEAN 1.8

SD SHTS 2.0 2. 1 2.3 2.0

11
NBS-114A (REV. 9-7 6)

U.S. DEPT. OF COMM. BIBLIOGRAPHIC DATA

SHEET

1. PUBLICATION OR REPORT NO.

FKBG CRP 115

2. Gov't Accession No.

4. TITLE AND SUBTITLE

CONTAI NERBOARD

Collaborative Reference Program for Containerboard

--port #115

3. Reciptenfs Accession No.

5. Publication Date June 4, 1979

7. AUTHOR(S)

J. Horlick, T. L. Cummings

8. Performing Organ. Report No. NBSIR 79-1576

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; and American Paper Institute/

Fourdrinier Kraft Board Group

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; Containerboard; Laboratory evaluation;

Precision; Reference samples; Testing calibration.

18. AVAILABILITY | [Unlimited

[X] For Official - bution. 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- Q 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