NATIONAL BUREAU OF STANDARDS REPORT

5148

SIMULATED PERFORMANCE TESTS OF

ADDITIONAL BITUMINOUS PROTECTED METALS

William C. Cullen

U. S. DEPARTMENT OF COMMERCE

NATIONAL BUREAU OF STANDARDS
U. S. DEPARTMENT OF COMMERCE

Sinclair Weeks, Secretary

NATIONAL BUREAU OF STANDARDS

A. V. Astin, Director

THE NATIONAL BUREAU OF STANDARDS

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NATIONAL BUREAU OF STANDARDS REPORT

NBS PROJECT

1000-30-4801 February 5, 1957

NBS REPORT

5148

SIMULATED PERFORMANCE TESTS OF

ADDITIONAL BITUMINOUS PROTECTED METALS

by

William C. Cullen

Floor, Roof and Wall Coverings Section

Building Technology Division

Sponsored by

Office of the Chief of Engineers

Department of the Army

IMPORTANT NOTICE

NATIONAL BUREAU OF S

intended for use within thr to additional evaluation anc

listing of this Report, eithe the Office of the Director, f however, by the Governmer

to reproduce additional cop

Approved for public release by the

Director of the National Institute of

Standards and Technology (NIST) on October 9, 2015.

progress accounting documents

irmally published it is subjected

, reproduction, or open-literature

ssion is obtained in writing from Such permission is not needed,

I prepared if that agency wishes

<nb|>

U. S. DEPARTMENT OF COMMERCE

NATIONAL BUREAU OF STANDARDS
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SIMULATED PERFORMANCE TESTS OF

ADDITIONAL BITUMINOUS PROTECTED METALS

by

William Co C-uilen

ABSTRACT

Simulated performance tests were made on four

bituminous protected metals representative of the

product of three manufacturers. The tests included

resistance to salt spray after shatter, accelerated

durability, and shatter at low temperatures.

One product (Color Galbestos) was rated as having

performed good or very good in all of the tests.

It is questionable whether the four materials

should be compared directly with each other since one

is of a distinctly different type from the other three,

1, INTRODUCTION

Under letter of authorization dated 17 April 1956, reference

ENGES , comparative simulated service tests were performed for

the Office of the Chief of Engineers, Department of the Army,

Samples, representing the products of the three manufacturers

as reported in NBS Report No, ^963 , "Simulated Performance

Tests of Bituminous Protected Metals", December l4, 1956,

were subjected to salt spray, accelerated durability, and low

temperature shatter tests.

The tests reported in the previous series were repeated,

with one major exception. In accordance with instructions from

the Corps of Engineers, the salt spray and fog tests were performed on the specimens which had been subjected to the lowtemperature shatter tests.
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For the resistance to flame spread test, refer to NBS

Report Noo TG10210-1992:FP-3390, "Report of Flame Spread

Tests on Protected Metals", dated 15 January 1957o

2,

MATERIALS

Materials were obtained by the Office of the Chief of

EngineerSo The materials submitted were as follows:

lo Plasteel, Maroon, Plasteel Products Corporation.

2, Galbestos, Maroon, coated one side, H. H. Robertson

Co,

3o Galbestos, Maroon, coated both sides, H. H,

Robertson Co,

4, Color Galbestos, Grey, coated one side, H, H,

Robertson Co,

5o Color Galbestos, Grey, coated both sides, Ho

Robertson Co,

6, Steelbestos, Maroon, coated one side, American

Steel Band Co,

7, Steelbestos, Maroon, coated both sides, American

Steel Band Co,

3.

TEST PRCCEDURES

The test procedures were essentially the same as those

described in NBS Report 4963 dated l4 December 1956,

4,

SUMMARY CF RESULTS

4,1 Salt-Spray (Fog) Test After Shatter

See NBS Report 4963 for the significance of this test.

The results of the salt spray tests after shatter, after 45

days exposure, are reported in Table 1,* To avoid repetition,

only the results on the specimens subjected to the -30°F shatter

test are reported. Generally, the results of the C°F tests

were similar, but somewhat less severe.

*Tables are attached to this report as Appendix A,
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Plasteel. Maroon ,

The resistance of this product to the salt spray tests

after shatter was poor. After 24 hours exposure, the specimens

showed severe corrosion in the area where the metal core was

exposed in the shatter test. The entire specimens were rust

stained within 10 days of exposure, resulting from the

corrosion at the edges and around the point of impact.

The most pronounced effect appeared to be on the adhesion of the coating to the basis metal. Loss of adhesion

had occurred on 100^ of the exposure side and on ^Qfo of the

reverse side.

Surface rusting was evident on an area of approximately

70% of the metal core. However, the only area showing any

appreciable penetration of the corrosion into the metal was

where the basis metal was exposed around the point of impact.

Galbestos. Maroon . This product showed good resistance to the salt-spray

tests after shatter. Several small areas of zinc chloride

deposits and a few pin-point areas of rust were the only

deteriorative effects that were noted after 45 days of

exposure

There appeared to be a slight loss of adhesion between

the weather coat and the asbestos felt layer. However, this

loss of adhesion was probably a result of the shatter test.

The adhesion of the felt to the metal was excellent even

after 45 days of exposure.

No rusting or other corrosion was evident on the metal

core even beneath the rust spots on the surface.

Color Galbestos. Grey .

The condition of this product after the test indicated

that its resistance to the salt-spray test was equally as

good as the maroon Galbestos. A few pin-point rust spots

were observed on the surface of the specimens which indicated

the presence of pinholes, A slight loss of adhesion between

the weather coating and the felt was observed, but this

probably resulted from the shatter tests.
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basis metal and there was no evidence of corrosion on the

basis metal,

Steelbestos, Maroon o

The resistance of this product to the salt-spray test

was generally poor. Rust stains around the point of impact

and a few pin-point rust spots were evident after l8 days

of exposure.

Loss of adhesion between the felt and the metal core

was severe on both specimens, ranging from 85^ to 98^ on the

exposure surface and 95^ to 100^ on the reverse surface.

The metal core showed surface rust on 4o to ^Qffo of the

specimen. However, this corrosion showed no appreciable

penetration into the metal,

4,2 Results of Accelerated Durability Tests

Refer to NBS Report 4963 for the significance of this test.

The results of exposure after 900 and 1000 hours are

reported in Table 2, Because of the similarity of the behavior

of the specimens of each product, regardless of whether they

were single coated or double coated or whether the edges were

sealed or not sealed, each product is treated collectively,

both in the table and in the summary that follows,

The_ accelerated durability tests will be continued until

the specimens have a total exposure time of approximately

2000 hours. Therefore, the results of the inspection for

loss of adhesion and corrosion will be reported in a supplementary report,

Plasteel, — — Maroon. —! -

i —

This product exhibited no external effects from the exposure, except for some loss of mica flakes with a subsequent

lightening in color. The resistance of this product to the

accelerated durability test was very good.
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GalbestoSo Maroono ' I ^ ty .. — . The failures exhibited by four specimens of this

product were similar in nature, but not always in degree.

There was a marked color change from a glossy, dark

maroon color to a dull, light maroon color, observed within

the 500-bour exposure period, which probably resulted from

the severe chalking of the protective weather coat. Pinpoint pits and hair-line cracks up to 1/h in. in length

appeared within the 500-hour exposure period. The cracking

progressed as the exposure time increased and at the 1000-

hour inspection it could be classified as severe. The

resistance of this product to the accelerated durability

test was rated as poor, based on the failure of the protective weather coat. Although this failure may not contribute

to the failure of the basis metal because of the other components of the protective system, it is conceivable that it

will require costly maintenance, if only for appearance sake.

Color Galbestos. Grey . Three of the four specimens which were exposed gave

similar results. However, on one specimen (coated two sides

and edges sealed), moderate to severe blistering developed

in the weather coat during the first 100 hours of exposure.

This blistering in turn developed into moderate cracking

during the 500- to 1000-hour exposure period.

No appreciable color change was evident after 1000

hours of exposure. However, slight pin-point pits had

appeared o Slight hair line cracks (just visible to the naked eye)

were observed on all specimens at the 1000-hour inspection.

Disregarding the blistering and cracking which were

apparent on only one of four specimens, the resistance of

this material to accelerated weathering test was rated as good.

Steelbestos. Maroon . There was a marked color change in this material, similar

to that reported for the Maroon Galbestos. Severe checking

of the anti-stick coating and severe chalking were noted after

the 500-hour exposure. Slight hair line cracks developed
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during the 500- to 1000-hour exposure. The resistance of this

product to the accelerated durability test was rated as fair.

4,3. Results of Low-Temperature Shatter Tests

For the significance of this test refer to NBS Report

4963.

The results of the low- temperature shatter tests are

reported in Table 3»

The results of the shatter tests at 0°F were similar in

nature to those at -30“F5 but a little less severe. Therefore, only the shatter tests at -30°F are reported,

Plasteel, Ifaroon .

The shatter resistance of this product was rated as poor.

Two serious deficiencies were noted upon impact of the steel

ball ut low temperatures. One was the actual loss of the protective coating which exposed the metal core, while the other

was the loss of bond between the coating and the metal in a much larger area, which in turn rendered the coating susceptible to some secondary force which could easily remove the

protective coating,

Galbestos, Maroon.

This product exhibited no appreciable effect from the

shatter test except a slight loss of adhesion between the

weather coat and the asbestos felt. The resistance of the

material to the test was very good.

Color Galbestos. Grey , Slight cracking of the weather coat was apparent both

on the exposure and on the reverse surfaces of the protective

coating. Otherwise the material performed equally as well as

the maroon Galbestos. Therefore, it was rated as very good.

Steelbestos, Maroon . The resistance of this material to the shatter test was

fair. Loss of adhesion between the felt and the metal core

in a small area around the point of impact was the serious

type of failure noted on the specimens of this product.

- 7 -

5. CONCLUSIONS

The performance ratings, based exclusively on the results

of the laboratory tests, are as follows;

Salt-Sprav Resistance After Shatter

Color Galbestos Very Good

Galbestos Very Good

S teelbe stos Poor

Plasteel Poor

Resistance to Accelerated Durabilitv

Plasteel Very Good

Color Galbestos Good

Steelbe stos F air

Galbestos Poor

Resistance to Low-Temperature Shatter

Galbestos Very Good

Color Galbestos Very Good

Steelbe stos F air

Plasteel Poor

The color Galbestos was the only material that was rated

as either good or very good in the three tests. However, the

cracking that appears to be developing after 1000 hours of

exposure may be significant.

It is questionable whether the four materials should be

compared directly with each other since one is of a distinctly

different type from the other three.

Neither the contents of this report nor the fact that

the tests were made by the National Bureau of Standards shall

be used for advertising or promotional purposes.
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APPENDIX A - TABLES.
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TABLE

1.

RESULTS

OF

SALT-SPRAY.

TESTS

AFTER

SHATTER 9

0) 1 1 1 a 1 1 1 O) 1 1 1 1 1 ^ CO 1 13 1 1 -P CD 1 1 1 Cd fcuO 1 a 1 1 0 TD 1 o 1 1—

1 p 0 1 1—

•H 1 cd 1 0 1 0

Cd 1 -p 1 rP 0 1 -p O 1 CD 1 ^ 1 0 P « CO 1 a 1 TD -p 1 a p +j O) 1 1 P 1 O O M 1 CO 1 0 HD 1 0 O Cd 'T! 1 *H 1 0 1 ‘H (—1 1 a CD 1 CO 1 -p p 1 0

cd 1 CD

a 1 cd 1 0 O 1 0

-p 1 fH -H -P 1 ,p 1 p 1 0d

d) 1 CD Cd 1 1 0 ® 0 1 S 1 > Cm 1 Cm 1 O -P 1 Cm

CD

O tcO 1 o 1 *H

O txo 1 O

W 1 CO sH 1 10 0 0 e 1 •H 1 -P -H 1 p 1 O ft-H 0 1 0

cn 1 o a -P 1 o 1 p

a -p 0 1 O

cd 1 -P -H CO 1 -H 1 p -H 0 0 1 -H

pq 1 O P 1 CO 1 o 0 a 1 0

CD P< P 1 O 1 O Cm P -H 1 O

-P 1 p 1 O

O 1 P

Cd -P -p 1 p 1 -P -P 0 1 P P cd ^ 1 o 1 ^ P> ^ 0U 1 o

CD W) 1 o 1 t0 0 tm 0 1 o

ID Td tH 1 1 "H *H *H 1 O CD 1—

1 o 1 1—1 O (—1 0 1 o

)s: CO cQ 1 s 1 02 ao2 0! 1 ^ o 1 1 -P 1 p. 1 1 0 1 © ^ © 1 O 1 « 0^ • Cm 1 0 1—1 cu c\j I 1—

1 rH -P CAJ o 1 1—

CDa 0 1 1 -p 0 0 1 0 © 0 0 Cm 1 P O -P 0 1—

-p 03 p. 1 0 Cm

03 o O 1 0 0 rH 03

M 1—

0 0 I :§

O 0 o 0 0 -P 1 0 P< 0 •rH 0 0 0 1 0 -p 0 -p Cm O 1 O 0 •P 1 a Cm 0 •H Cm -p 1 o 0 -P •H p 0 1 0 1 P •rH 0 0 0 1 03 0 0 -p 0 O 1 0 •rH 1 0 0 0 0 03 o 1 0 •rH -P 1—

0 0 1 -P 0 O 1 > Cm 0 P 0 0 •rH o 1 -p 0 o 0 0 0 Cm I o O P< 1 o O 0 0 O 0 03 1 1 o O ft o Cm 0 P 1 a •rH 1 > 0 !3 0 1 ft •rH 0 -p p 0 1 0 0 -p 1 0 -P -P O 0 P 0 rH 1 0 0 -p Cm 0 Cm 0 0 1 0 0 1 -P 0 0 P^03 0 P 03 1 0 0 P 0 O 0 -P 01 1 o •H 03 tH 03 0 0 1 -p -0 0 P o 0 1 0 03 -P 1 O 0 0 0 o 1 0 TD -P

CO 0 a 0 1 0 cd f“H 1 0 P< 0 0 O 03 1 0 0 1—

0 O P 1 P 0 1 O Cm 0 O P, 1 P 0 P o •H 0 0 1 Cm Cm 1 -p -P -H O 0 •rH !x! Cm 1 Cm Cm O 0 0 > 1 -P O 1 0 0 0 P 0 0 o 1 -P e O

•rH Cm 0 Cm 0 1 0 03 1 0 0'fe^ 0 0 1 0 rH 03 p P 01 O P 1 •H 0 0 1 P 0 0l UA > 0l Cm 0 1 •rH 0 0 0 0 0 03 O 0 0 1 © 0 03CX2 0 0 TD O 03 1 o 0 0 0

p> 0 0'feR-CM 1 O 1 -P 1 1 •H 0 P 0 0 •rH 1 ft 0 O « o O 1 1 rH -P 1 0 0 0 0 0 0 1 1 ftrH -P

pq Cm Cm

O 0 0 1 •rH 0 -P Cm

O Cm

a cmcdo 1 0 0 O O rH^I •rH -p O 1 o 0 0 o O •rH O ON 0 1 •H Cm -P O

CO 1 01 o 1 Ph

a I—

o 0 1 ftO -0O 0 0 CJM « fciO 1 1 -p 0 0^^ 0 0 0 p 1 bjO

O 0 O > CD •rHp o 1 0 Cm 0 0 •P o P. 0 O 0 1 > 0 •rH P O o 0 1 0 O 1—

0 -p 1 •rH O 0 O 0 o 0 o > 1 0 o 1—0

rH 1-0 r—

O 1 pcH 0 CO C3 1 Ps Ph 1-0

a rH hP r—

0 1 fP 0 CO 01 0 Cm -p 0 1 0 -P 0 p 1 Cm -P

-P 03 1 P 0 a 1 0 '03 03 0 -P 1 P 0 • © 0 0 1 © 0 « 0 a 1 o 0 o • 0 0 o © 0 0 1 • 0 o 0 1 2 a 0 1 rH 0 CM ;5 •rH 1 rH f 2 3 a a 0-4- a o 1 (

i 0 CM ;s o

cd f—1 

1 TD e 1 03 © 1 0 1 1 0 -p 1 0 0 p 1 •rH 1 1 0 0 1 O 0 0 1 P 1 1 0 o 1 -P o 1 0 0 1 1—1 1 o 1 o 1 0 1 o 1 o

-P 1 0 1 -p 0 1 1 0 0 1 1 p 0 1 0 1 0 1—1 0 1 03 1—1 0 1 0 S 1 -P 1 0 tuOrH 1 1—1 b£) (—1 1 P 0 0 1 03 0 0i 1 0 1 O 03 0 1 1—1 •rH 0 1 0 •rH 0 1 1—1 1—1 1—1 1 0 CO o 1 -P CO O 1 O 0

ft 1 C.H 03 1 CO 03 1 o 03
I

I

f

I

I

1 '.., * •’ . t

. I ~ ^r- '

.t

t« , * M I •

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TABLE

2,

RESULTS

OF

ACCELERATED

TEST

FOR

DURABILITY

10

1

1

1

1

1

1 0 bO

1 1 fccO TD P Ph

1 CP 1 S3! fccOft CP -H p

1 1 •H 0 ftft » 0 p

1 1 -P •H OOP 5x0 P p

1 1 -P ft -p 1—1 CP 0 P P ft! TP

1 a 1 •H 0 CO CP ft ft ft P ft p

(P 1 o 1 ft 0 cd 0 > 0 ft ft a p ft

1 Ih 1 S3! p a CP 0 0 ft p p

p 1 i+H 1 0 0 TD TP CP p 0 !5 0

cn 1 1 a •H p P ft p p 0

o 1 (P 1 cd -P CP CP 5x0 P CO 0 S3C,<ft 1 ft 1 txO 1 0 p > P P P 0 p «

1 S3! e 1 tcO CP CP 0 ft 5x0 ft P ft P

W 1 C3 f3l 1 S3! ft > ft P P P 5x0ft P

1 3::! 0 1 •H CO CP tip 0 ft P ft P p p a

Ih 1 0 •H 1 S3! CO P P ft P 1—

•H 0 *H P 1 P> 1

1—

•H •H P ft 0 ft ft TP 0

O 1 0 1 cd 0 ft 0 P ft P ft 0 P

1

1 a CP 1 ft P ft Cd ft 1 •H p p P,

1 CP ft 1 0 S3 0 CP 0 0 p p P ft! P

o 1 u CO 1 0 CP 0 P 0 ft 0 0 ft o 1 ct3 S3! 1 ON ft ft ft ®'IP\ p o 1 ft-H 1 tuO 1 Cd P ft 5x0 ft e P P 5x0

1—

1 ft 1 S3! 0 P CP P P ft P P 0 TP

1 cd p 1 •H 0 CP ft e P ft ft 5x0 ft P P

1 ^3 1 TD TD -P CP ft ^ -P •H > 5X0 1

1 0 0 1 Cd 0 cd 0 P P 1—1 ft- P P TP

1 1 ft -P S CP cd ft ft ft (02 CO ft P

1 1 1 cd ? ft P 1 1 ft 1—

1 0 1 P P P

1 0 0 1 0 CO e ft P 0 e CO 0 0 “Op

1

1

1

1

1—

1

1

1

1

1

1 Cd rvj 0 CO 1—1 CXI P ft ft CM 0 P

1

1

1

1

1

1

1

1

« P

1 1 e •H e 0

1 1 0 tuO 0 5X0 P p

1 1 ft S3! S3! ft" ft p P P TP

1 (h 1 P 0 -H p 0 ft ft P P p

1 (P 1 Cd 0 ft 1—

P D P ft 5x0

1 -P 1 TD P tft XP p 0 ft ft 0 TP

(U 1 .x:! 1 Cd cd 0 p P , 0) S P

u 1 M 1 ON a ft ft <^a ft ON 0 rO 1

1 •H 0 1 >5 0 0 P P 5x0ft!

cn 1 1—

CO 1 CO ft ft p ft P 5x0 5x0 P P

o 1 CP 1 CO ft CP e P p ft 0 P 0 p P ft 1—

ft 1 Cd 1 0 tcO P 5X0 0 5x0 5x0 P 1

1 P ft ft P

« 1 cd 1

1—

•H CP P CO 1—1 *H P P 5x0ft P P P

1 0 1—

1 bflft > •H ft 5x0 1—1 *H > 0 0 P 0 P

1 •p ft 1 CP ft 0 ft P txOCH ft 0

1 1 cd ON (0 -P P P “'ft P f::! 0 P P ON

1 CP cd 1

1—

•H P 1—1 P •H 0 ft P TP O 1 tuO 0 1 aft 0 ft 0 a ft ft 0 ft P ft ft (D P

W1

1 S3! •H 1 0 P ft 0 p 0 ft ft P 0 fti ft! ft •

1 cd a 1 P 'O ft CP P TP ft 0 0 ft P

o 1 1 ft CP p p ft P P Sft 1—

p P 0 ft o 1 0 ft 1 Cd ft •H •H P ft ft p ft p 0 P

UA 1 0 1 W) cd 0 ft 0 5x0 P P ft ft ft p |3 1 0

1 P 1 S3! 0 p ft ft Pop P ^ ft! ft P P

1 0 CO 1 •H -P CP 1 P ft •H ft P P 5x0 5x0 P p TD 1—

P

1 1—1 e CO 1 ft ft P •H tuO TP TP TP •H "H ft TP P ftl P

1 0 S3! 0 1 Cd S3^ 0 •H Cd p p p 0 0 1—1 1—OOP P a

1 0 0 ft 1 ft 0 S ft ft CP Ift 0 s s CO CO P s 0 ft

1 0 1 0 1—

0 p ft TP 0

1 p 1 P p S3C| ft p

1 0 cd 0 1 0 Cd e e 0 p * p 0 0 0 0 S3C< ® P P (=5,

1

1

1

1—

a ft 1

1

1—1 a ft eftft- •H ft a eft (—1 CM P roft 0 P

1

1

1

1

1

1 1 ft e TP 0 TP “

1 1 S3! ft P P ft P ft

1—

1 1 Cd cd 0 P P P P

1 1 CO 0 ft 0 P 0

•H 1 1—1 1 0 1 0 P 1 0 0 1 0

1 CP 1 -p CP 1 P P 1 ft P 1 Q) 1 CP 1 CO H CP ft 1—Ip P (—1 P

-P 1 p> 1 CP hOrH 1—1 5x0 1—

P P 5x0ft

C3 1 w 1 fti S3! ft P P ft 0 ft P ft s 1 cd 1 1—

•H p P ft P 1—1 1—

ft P

1

1—

1 cd CO 0 ft (ft 0 0 P CO 0

1 ft 1 0 (ft ^ TP 0 0 TP
I
TABLE

3,

LOWTEMPERATURE

SHATTER

TESTS

AT

-30®F

Material

Shatter,

sq.in.

Loosening,

sqoin,,

Weather

Reverse

Weather

Reverse

Side

Side

Side

Side

W)Ch 1 1 n o 1 1 CD

1 'H 1 H 1 1 -P P

CD -P -P 1 txO P> 1 CD Cd p

rP Cd n 1 a cd cd ch 1 p CO

c O *H 1 •H CD o o 1 » P o

o o 1 P> p o 1 P cd ft

cd OH ft 1 Cd cd -p 1 O H O !x! •H CD .a 1 o p 1 •H CD O CD

txo cn ch o a 1 o sq o •H 1 CO Ch

c: CD HO 1 cd H O 1 CD P p •H X! T3 -P p 1 CD P> ft 1 P P CD P -p TD a W H 1 O n CO 1 p sH P o

cd cd cd 1 1 Cd •H o 1 a 1 cd cd p p o •H ® 1 H p H o 1 cd o <H H -P fd 1 P -P CD -P p 1 H p CD o Cd c:| H 1 qs H H a <H 1 O cd Is o CO a o cd 1 CO CD 0) Cd 1 o CD

CD Vi O C\J 1 <H s 0 1 CO O Ch P P CD Vi Cm \ 1 H cu <H f:l 1 CO o o •H

;s O P O H 1 O CO •H O 1 OP cd CO -p H CD 1 1 o Td 1 1—1 CD W) ft

CD o Pi w)j- 1 fciO-P tcOP- 1 Pda CD -p H H a 1 CO a 1 P P H H CO P Cd H tcO 1 •H CD •H tuO 1 P cd p P

O tcO CD P Sq 1 p p p a 1 tiO CD O <P CD C rH •H Is Cd H 0 1 Cd CO © cd •H • 1 •H Is Cd O > o i—1 {—1 4-^ 1 1—1 cd S H P -P 1 1—1 P CD pq H CQ S (p P o 1 pin •H fp O 1 CO d o p P

cd CD CD cd 1 a CD Cd 1 CD d

-p CD -P ft 1 o c\) P> ft 1 CD H P e CD "Is o

[><i a 1 c P\ 0 X G 1 » Is o o d

1—1 a H H C\J CD H 1 1—1 1—1 C\J CD H 1 H P CM ft cd

1

1

1

1 o

1

1

1 o 1 1 ^ 1

1

1—

1 O

1

1

1

1

1

1—

1

1

1

1 o

1

1

1

1

1

1

1

1

1

1

1

1 CM

1

1

1

1

1

1 CM 1 1 0 1

1

1—

1 o

1

1

1

1

1

1—

1

1

1

1

1 o

1

1

1

1

1 O

1

1

1

1

1

1

1

1

1

1

1

1

1

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1 O 1 1 1

1

1—

1 o

1

1

1

1

1 O

1

1

1

1 o

1

1

1

1 [>-

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1 ° 1 1 1

1 fp 1 o

1

1

1 o

1

1

1 o

1

1

1

1

1

1

1

1 CO

1

1

1

1 1 O 1

1 CO 1 P 1 CO

1

1—

1 O 1 CO 1 o

1 CD 1 P 1 CD 1 p 1 CD 1 CO 1 P 1 P CO

1 P 1 CD 1 1—1 1 O CD

1 CO 1 P 1 CD 1

1—1 P 1 Cd 1 H 1 CD 1 O H 1 1—4 1 cd 1 P 1 o Cd

1 ft 1 a 1 CO 1 p

THE NATIONAL BUREAU OF STANDARDS

Functions and Activities

The functions of the National Bureau of Standards are set forth in the Act of Congress, March

3, 1901, as amended hy Congress in Public Law 619, 1950. These include the development and

maintenance of the national standards of measurement and the provision of means and methods

for making measurements consistent with these standards; the determination of physical constants and properties of materials; the development of methods and instruments for testing materials,

devices, and structures; advisory services to Government Agencies on scientific and technical

problems; invention and development of devices to serve special needs of the Government; and the

development of standard practices, codes, and specifications. The work includes basic and applied

research, development, engineering, instrumentation, testing, evaluation, calibration services, and

various considtation and information services. A major portion of the Bureau’s work is performed

for other Government Agencies, particularly the Department of Defense and the Atomic Energy

Commission. The scope of activities is suggested by the listing of divisions and sections on the

inside of the front cover.

Reports and Publications

The results of the Bureau’s work take the form of either actual equipment and devices or published papers and reports. Reports are issued to the sponsoring agency of a particular project

or program. Published papers appear either in the Bureau’s own series of publications or in the

journals of professional and scientific societies. The Bureau itself publishes three monthly periodicals, available from the Government Printing Office: The Journal of Research, which presents

complete papers reporting technical investigations; the Technical News Bulletin, which presents

summary and preliminary reports on work in progress; and Basic Radio Propagation Predictions,

which provides data for determining the best frequencies to use for radio communications throughout

the world. There are also five series of nonperiodical publications: The Applied Mathematics

Series, Circulars, Handbooks, Building Materials and Structures Reports, and Miscellaneous

Publications.

Information on the Bureau’s publications can be found in NBS Circular 460, Publications of

the ^ational Bureau of Standards (.SI. 25) and its Supplement V-fO. 75), available from the Superintendent of Documents, Government Printing Office, Washington 25, D. C.

Inquiries regarding the Bureau's ref>orts should be addressed to the Office of Technical Information, National Bureau of Standards, Washington 25, D. C.