v/

NATIONAL BUREAU OF STANDARDS REPORT

6389

PERFORMANCE TESTS OF PROTECTED METALS,

SERIES 1959, COLOR PROTECTED METALS

by

William C. Cullen

Edward W. Bender

Edgar H. Mac Arthur

Sponsored by

Office of the Chief of Engineers

Bureau of Yards and Docks

Department of the Air Force

Washington 25, D, C.

<^>

U. S. DEPARTMENT OF COMMERCE

NATIONAL BUREAU OF STANDARDS
THE NATIONAL BUREAU OF STANDARDS

Functions ^nd Activities

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

3, 1901, as amen«led h) Congress in Public Law 619, 1930. 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

develo|unent of standard practices, codes, and specifications. The work includes basic and applied

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

various consultation 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 hack 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 Techni«al News Bulletin, which presents

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

which provides data for «lcterinining the best frequencies to use for radio conunimications throughout

the world. There are also five series of nonperi«>*lical publications: The Applied Mathematics

Scries, Circidars, Handbooks, Building Materials and Structures Reports, and Mis<-ellaneous

Publications.

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

the National Bureau of Standards ($1.25) <uid its Supplement ($0.75), available from the Superintendent of Documents, Government FVinling Office, Washington 25, D. C.

Inquiries regarding the Bureau’s reports should be addressed to the Office of Technical Information, National Bureau of Standards, Washington 25, D. C.
NATIONAL BUREAU OF STANDARDS REPORT

NBS PROJECT NBS REPORT

1000-12-4801 April 30, 1959 6389

PERFORMANCE TESTS OF PROTECTED METALS,

SERIES 1959 , COLOR PROTECTED METALS

by

William C. Cullen

Edgar H. MacArthur

Floor, Roof and Wall Coverings Section

Building Technology Division

Edward W. Bender

Fire Protection Section

Building Technology Division

Sponsored by

Office of the Chief of Engineers

Bureau of Yards and Docks

Department of the Air Force

NATIONAL BUREAU OF

intended for use within 1 to additional evaluation a

listing of this Report, eitl the Office of the Director however, by the Governm

to reproduce additional c

IMPORTANT NOTICE

Approved for public release by the

Director of the National Institute of

Standards and Technology (NIST)

on October 9, 2015.

)r progress accounting documents

. formally published it is subjected

ng, reproduction, or open-literature mission is obtained in writing from

3. Such permission is not needed,

illy prepared if that agency wishes <N^>

U. APARTMENT OF COMMERCE

NATIONAL BUREAU OF STANDARDS

PERFORMANCE TESTS OF PROTECTED METALS,

SERIES 1959, COLOR PROTECTED METALS

by

^lliam C. Cullen

Edward W. Bender

Edgar H. MacArthur

1„ INTRODUCTION

As part of a building materials investigation at the

National Bureau of Standards under the sponsorship of the

Tri-Service program, a series of simulated performance tests

were made on samples of color protected metals submitted by

three manufacturers. The series of tests to which the

samples were subjected was designed to simulate actual service

conditions as far as practicable in the laboratory. The test

procedures employed in the series were as follows;

(a) Accelerated Weathering.

(b) Low-Temperature Impact at;

1) 0°F.

2) -30°F.

(c) Salt Spray;

1) Before Impact

2) After Impact

(d) Abrasion-Resistance to Air-Blown Sand.

It should be stressed that the laboratory tests are most

useful in making a general evaluation of color protected

metals when adequate service histories are lacking. However,

if the service history of a product is known to be at variance

with a test result, naturally the service history should be

given the most weight.

2

2. MATERIALS

Samples of the color protected metals were submitted by

the respective manufacturers in response to a letter request

of the Office of the Chief of Engineers. It is understood

that a representative of the Pittsburgh District Engineers

Office was present at each factory when the samples were

selected

Unless otherwise stated, the samples submitted were

24-gauge siding sheets with standard corrugations (max,

2-5/8 in. ) and grey in color. In cases where a field coat

was recommended, the coating was applied at N,B,S, using

manufacturer's application instructions.

The materials that were tested under the project are

listed alphabetically and the descriptions were taken

verbatim from the manufacturer's literature.

2.1 Color Galbestos, Manufactured by the H.H. Robertson

Company, Pittsburgh, Pa.

Description ; "First the steel core is pickled and dipped

into a bath of molten zinc. Immediately a layer of asbestos

felt is applied under great pressure. When the zinc hardens

the felt is gripped in an absolute metallic bond. The asbestos felt is then given an asphaltic impregnation, then a

tough thick waterproof outer coating in one of six colors

is applied to one or both sides".

2.2 Color Clad Plasteel, Manufactured by Plasteel

Products Corporation, Washington, Pa,

De scription ; Regular Plasteel - "The treated steel core

shall be coated with an asphaltic rust inhibitive bond coat,

after which two mastic coats of water repellent, corrosionresistant bituminous material shall be rolled on under heat

and pressure. Into this coating shall be imbedded a surface

coating of mica. The plasteel sheet shall be coated with a chemically inert, emulsified acrylic resin which is resistant

to corrosive industrial atmospheres and which is compounded
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with durable light-stable pigments. This coating shall not

be subject to oxidation and shall remain flexible,”

De scrlption ; Plasteel CP-400 - No description is available for this except that it is made on a zinc-coated metal

sheet.

2,3 Color Steelbestos, Manufactured by American

Steel Band Company, Pittsburgh, Pa,

De scription : "In manufacturing Color Steelbestos, a thoroughly cleaned steel core is etched and primed with a rust-preventive coating that simultaneously deposits a

corrosion-resistant, tightly-knit phosphate coating plus a chemically bonded thin organic film which at once protects

the phosphated surface from corrosion and provides an ideal

surface for the adhesive. The exclusive synthetic resin

bonding agent is then applied. Long-fiber white asbestos

felt is immediately put on this adhesive and the sheet is then

oven-cured. An asphaltic saturant impregnates the white

asbestos felt. These steps create a homogeneous envelope

that thoroughly protects the steel core against corrosive

atmospheres. After the asbestos felt has been cured and

impregnated with an asphaltic saturating compound, it is

uniformly covered with two layers of American’s special

Vinol plastic sealer, which prevents bleeding of the asphalt

and is itself water-repellent and corrosion-resistant.

Then the surface is given two coats of water-repellent,

corrosion-resistant American Alkol plastic color coating,

in the color selected by the customer. One coat is shopapplied, the second coat is applied in the field after

erection to give a better, smoother appearance,”

3, TEST PROCEDURES

3,1 Thickness Determinations

The thickness determinations of the protective coating,

felt and metal core were made with a micrometer caliper

which was equipped with a 1/4-in, diameter head.
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3.2 Accelerated Weathering Tests

Duplicate 10-in. X 12-in. specimens of each sample were

exposed in a low-intensity, enclosed carbon arc unit, "WeatherOmeter”, manufactured by the Atlas Electric Devices Company,

Chicago, Illinois. Only one arc lamp, centrally located, was

used as a source of radiation. The unit was operated approximately 23 hours per day, 5 days a week. The cycle used was

51 minutes of light and 9 minutes of light and water. The

water was essentially mineral and metal free and was kept

at a temperature of 80 ±5°F.

A plot of the time-temperature curve of a typical

cycle is reproduced in Figure 1. The temperature measurements

were made with a black-bulb mercury thermometer at the panel

surface

Visual inspections were made periodically and significant changes were recorded.

3.3 Low-Temperature Impact Tests

Triplicate, 10-in. X 12-in. corrugated specimens of each

sample were subjected to the impact test at 0°F. and at -30®F.

The specimens were conditioned at the specified temperatures

for a minimum of one hour and placed on a firm support (concrete floor covered with 1/4-in. linoleum) with the exposure

side up. A 76O gram (1.68 lb.) steel ball was dropped from

a height of 7 ft. and was controlled to strike the specimen

on the crest of a corrugation at a point approximately at

the center of the specimen.

After impact the specimens were brought to room temperature and two of the specimens were examined. The third

specimen (-30°F. only) was set aside for exposure to the

salt spray test.

The protective coating and/or felt which was removed

by the impact was considered as shatter while that which

could be easily removed by probing with a knife blade or
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similar instrument was classed as looseningo The shatter

plus the loosening were taken as the total area on which

a loss of adhesion occurred and was recorded as such.

3.^ Salt Spray Tests

Two 10-in. X 12-in. corrugated specimens of each sample

were exposed to the salt spray test. One specimen was in

the "as received" condition while the other had been subjected to the impact test at -30°F. The salt spray tests

were conducted essentially in accordance with the method

described in ASTM Designation: B 117-^^T, Tentative Method

of. Salt Spray (Fog) Testing. The specimens were exposed

continuously for 45 days and were inspected at weekly intervals and at the completion of the exposure period.

3.5 Abrasion Tests

The abrasion tests were designed to study the influence

of the type of material (Test A) and the thickness of the

protection (Test B) on the abrasion resistance of the entire

coating system. An abrasion apparatus, employing an unsupported abrasive, was developed and constructed for the

study. A photograph showing the apparatus is presented in

Figure 2.

Flat specimens (4-in. X 4-in. ) were exposed in triplicate to both Test A and Test B. Test A determined the

abrasion resistance of the protective coating while Test B

determined the time which was required for the abrasive to

penetrate through to the base metal under the standard

conditions of the test.

The test conditions employed in the abrasion tests

were as follows:

(1) Abradant - Standard Ottawa Silica Sand.

(2) Position of Test Specimen - Angle of 45° inclination.
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Distance of Specimen from Nozzle;

Test A - 4 in.

Test B - 1-1/2 in.

(4) Air Pressure - 3 psi.

(5) Abradant, rate of flow - l44 grams/minute.

(6) Exposure Times;

Test A - 10 minutes in 5 intervals of 2 minutes each.

Test B - Time to penetrate through coating and expose

metal.

3.6 Flammability Test Methods

The materials were tested by two different flame-spread

methods, an inclined tunnel test and a radiant panel test.

The inclined tunnel test, which has been used in many

previous tests of this type of product, involved placement

of the specimen as the cover or upper enclosing surface of

a tunnel 12 ft. long, and about 40 in. wide, and 9 in. deep.

This tunnel was inclined at a slope of 5 in. vertical to 12

in. horizontal. The three fixed sides of the tunnel were of

sheet metal lined with asbestos-millboard. The igniting

flame was applied to the under surface of the specimen at the

lower end.

All specimens for this test were so assembled as to have

one joint running the 12-ft. length, and they were placed with

the surface intended for interior exposure facing downward and

exposed to the igniting flame. The flame was applied for 35

minutes, and was produced by burning gas with a calorific value

of approximately 1100 BTU/cu ft, at a rate of 3 cu ft/min for

30 minutes followed by a rate of 5 cu ft/min for 5 minutes.

The length of the igniting flame, measured with an unprotected

sheet metal cover in place of the test specimen, was about

2-1/2 ft. Two specimens of each material were tested.
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The radiant panel method has been described in the

article, "A Method for Measuring Surface Flammability of

Materials Using a Radiant Energy Source”, Proc. ASTM, Vol.

56, 1956 . It provides a means for exposing small specimens

in a standard fashion to a radiant heat and ignition source.

Measurements are made of the rates of flame spread and heat

release. These factors are combined to produce a flamespread index which provides a numerical means for classification of material flammability. Smoke production by the speci

men is reported in terms of the weight of material deposited

on a glass filter disk.

For some of the tests made by this radiant panel method,

the corrugations in the materials were flattened out as much

as feasible before the test specimens were cut. In other

cases the test specimens were cut with the corrugations

running lengthwise of the specimen. From two to four specimens of each material were tested.

3.7 Fuel Potential

This test method is currently under development at the

NBS . It is intended to furnish a quantitative measurement

of the heat of combustion of which might be released on

exposure of the materials to conditions similar to a building

fire. A simplified form of this test method was used to provide an indication of the fuel potential of the coating materials used. Standard Parr bomb calorimeter equipment was

used for measurement of the heat of combustion of the interior coating of one sample of each of the three types of

coated metals.

4. TEST RESULTS

4.1 Thickness of Components

The thicknesses of the various components of the color

protected metals are given below. In cases where the coating

are veined, the thicknesses given are maximum.

- 8 -

4.1.1 Color Galbestos (Veined Coating)

Total Thickness - .083 in.

Metal Core - .027 in.

Felt, Exposure Side - .010 in.

Coating, Exposure Side - .018 in.

Felt, Reverse Side - .010 in.

Coating, Reverse Side - .018 in.

4.1 ,2 Color Clad Plasteel (Coated Both Sides)

Total Thickness - .055 in.

Metal Core - .024 in.

Bituminous Coating, Exposure Side - .012 in.

Color Coating, Exposure Side - .004 in.

Bituminous Coating, Reverse Side - ,011 in.

Color Coating, Reverse Side - ,004 in.

1

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• .3 Color Clad Plasteel (Coated One Side

Total Thickness - .052 in.

Metal Core - ,024 in.

Bituminous Coating, Exposure Side - .012 in.

Color Coating, Exposure Side - .004 in.

Bituminous Coating, Reverse Side - .012 in.

4.1 .4 Color Steelbestos

Total Thickness .054 in.

Metal Core - 0.O 27 in.

Felt, Exposure Side - .009 in.

Coating, Exposure Side - ,006 in.

Felt, Reverse Side - .009 in.

Coating, Reverse Side - .003 in.
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- 4.2

Accelerated Weathering

The accelerated weathering test is a laboratory tool for

determining in a relatively short time the resistance of an

organic material to the factors encountered during normal

weathering, as heat, ultraviolet light and moisture. It has

been shown that a test of this type will produce the principal types of failure, such as fading, blistering, cracking,

embrittlement and shrinking, that a material may exhibit

during a longer period of natural weathering. It is

stressed, however, that no conversion factor for relating

the accelerated weathering test to weathering under natural

conditions has been established.

The results of exposure up to 1000 hours are described

below. The accelerated weathering test will be continued

until the specimens have a total exposure time of 2000

hours, and the final results will be reported in a supplementary report.

4.2.1 Color Galbestos - Rating: Fair .

The "Fair" rating was based on the cracking which

appeared between 500 and 1000 hours of exposure and on the

separations (approximately 1/4 in.) of the coating from the

metal in the valleys. The break was within the asbestos

felt and was observed after 600 hours of exposure. It

was apparently caused by a shrinkage of the color coating.

4.2.2 Color Clad Plasteel - Rating: Excellent . The material was rated "excellent" in this test

because no appreciable change has occurred in any specimen

after 1000 hours of exposure.

4.2.3 Color Steelbestos - Rating: Poor . The "poor" rating is based on the severe blistering

and moderate cracking that occurred within the 1000-hour

exposure period. As in the case of Color Galbestos, there

is a separation of the coating from the metal in the

valleys which is apparently caused by a shrinkage of the

color coating.

4.3 Low-Temperature Impact Test

In practice, color protected metal sheets can be subjected to impact or shock during transportation and/or

installation. This can occur in handling the sheets while

unpacking and readying them for installation or when they

are being fastened to the structural frame. After installation, impact can occur at the lower siding courses or from

hail or other missiles. Damage to the protective system is

not likely to be serious when the temperature is moderate.

However, at low temperatures, damage can be serious.

The low temperature impact tests were designed to give

an indication of the ability of a protected metal to resist

damage from impact or shock at low temperatures. Tests

were made at 0°F. for installations in temperate climates

and at -30°F. for installations in colder climates.

The tests were made on materials that were prepared

on a 24-gauge base metal which experience has shown to be

the least resistant to the low-temperature impact test.

For comparison purposes, the results of the lowtemperature impact tests are presented in Table 1.

4 , 3.1 Color Galbestos - Rating: Excellent . The damage to Color Galbestos at both 0°F. and -30°F.

was slight. Figures 3 and 4 show the extent and type of

failure that occurred on this product. In each case the

adhesion was lost between the coating and the felt or

within the felt itself. Slight to moderate hairline cracking was observed around the point of impact and on other

areas of the panel.
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4.3.2 Color Steelbestos - Rating: Good .

The damage that occurred to Color Steelbestos was slight

to moderate. As expected, the effect of the impact was more

severe at -30°F. than at 0°F. , both on the exposure and the

reverse sides of the specimens. Figures 5? 6, 7 and 8 indicate typical failures that occurred with this product at

both 0°F. and -30°F. In every case the loss of adhesion

occurred between the felt and the metal core.

4.3.3 Color Clad Plasteel, CP-400 - Rating: Fair .

The damage that occurred to this material was classed

as moderate to severe. The type and extent of the damage

that occurred is shown in Figures 10, 12 and l4. As expected, the most severe failures occurred at -30°F and on

the specimens which were coated both sides.

Cracking of the coating and actual shatter on an area

of about one square inch was observed in the vicinity of

the point of impact.

4.3.4 Color Clad Plasteel, Regular - Rating: Poor . This material was rated as poor because of the severe

loss of adhesion and of the actual cracking and shatter

that occurred on all specimens at both 0°F. and -30°F.

The types of failures that were observed were similar to

those described for the CP-400 type, but to a greater extent as shown in Figures 9? 11 and 13.

4,4

Salt-Spray Tests

The salt-spray test is a laboratory procedure by which

inherent weaknesses in a protective system may be revealed.

It is also used to measure the continuity of a coating and

to indicate the ability of a coating system to afford protection in a humid atmosphere where corrosive agents may be

pre sent

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FIiiURE 7. COLOH STEKLBESTOS, FHONT, 0°F, 2.9 SQ. IH. FIG'JHE 8. COLOH STESLBESTOS, BACK, 0»F, 3.6 SQ. IN.
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16.2 SQ. IK. FIGURE 13.

12

Where the salt-spray tests were performed on specimens

subjected to the impact test, the purpose was to provide

information as to the ability of a material to withstand

corrosive agents after damage to its protective system.

^,4.1 Color Galbestos - Rating: Excellent .

The condition of the Color Galbestos specimens during

and after the test was excellent. A number of pin holes,

perhaps 50 to 100, as evidenced by rust deposits were the

only deteriorative effects noted during the 45-day exposure

period. The specimen subjected to the impact test evidenced numerous hairline cracks over the entire surface,

especially noticeable around the point of impact. However,

there was no evidence of corrosion at the cracks or in the

area of the point of impact. The adhesion of the entire

protective system appeared intact and no corrosion of the

base metal was noted.

4.4,2 Color Clad Plasteel, Regular - Rating: Poor . The condition of all specimens of Regular Plasteel

was rated as poor regardless of whether the material was

coated one side or two, or whether the specimens were previously subjected to the impact test or not.

Numerous pinholes and blisters were observed on this

product during the test. Severe rusting was observed which

resulted from pin holes, cut edges, and, in the case of the

specimen subjected to the impact test, from the area beneath where the protective coating was damaged.

The final examination revealed that 100^ of the adhesion between the coating and the metal was lost on the

exposure side of both specimens and somewhat less (60^

to 90^) on the reverse sides. The metal cores showed evidence of corrosion (rust stains) on more than 50 areas

ranging in size from pin point to 3/4 in. in diameter.

More severe corrosion was noted on the metal core of the

specimen after the impact test on both sides in the areas

near the point of impact.
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4.4.3 Color Clad Plasteel, CP-400 - Rating: Fair . This material was rated a step better than Regular

Plasteel, based on its better performance in regard to

adhesion of the protective coating and in corrosion resistance of the base metal. The failures which occurred

were similar in nature to those that occurred on Regular

Plasteel, but to a lesser degree.

The final examination revealed a loss of adhesion of

50^ to 80^ on the exposure surfaces and less than on the

reverse surfaces. There was evidence of corrosion either

in the form of rust or zinc salts on the base metal on the

areas where the adhesion was lost.

4.4.4 Color Steelbestos - Rating: Poor .

The poor rating is based on such failures as pin holes,

blistering, and apparent embrittlement of the coating,

which were observed during the exposure, and the severe

loss of adhesion (100^) on both sides of each specimen.

Corrosion in the form of rust was observed on an estimated

area of 35^ on the control specimen and a much larger area

of the specimen subjected to the impact test.

4,5 Abrasion Tests

In military construction many building materials are

exposed to the abrasive forces of air blown sand or other

abradants, especially when they are located in windy, arid

areas or in the vicinity of airfields.

Studies of the effects of abrasion were designed to

determine the resistance of a respective coating system

to the abrasive effects of airblown sand. The study was

divided into two phases to determine the following:

1) The abrasive resistance of the coating material and,

2) the influence of coating thickness of a specific material

on its abrasion resistance.

- l4 -

The results of the abrasion tests are presented numerically in Table 2 and graphically in Figures 15 and l 6 . The

abrasion resistance of the coating material in terms of

weight loss per unit time, reported in Table 2, is equal

to the slope of the respective curve in Figure 15.

The bituminous (black) protected metals were included

in the abrasion test for comparison purposes.

Adjective ratings have been omitted in the abrasion

tests because of the lack of criteria to differentiate

between an excellent rating and a poor rating.

TABLE 2. RESULTS OF ABRASION TESTS

Material

Weight

Loss

Time to Remove

Color Coat Time to Metal

mg/min Seconds Seconds

Color Galbe stos 30.0 80 290

Black Galbe stos 21.0 — 330

Color Clad Plasteel 11c 5 30 128

Black Plasteel 29.1 — 285

Color Steelbe stos 12.6 45 280

Black Steelbe stos 19.9 — 290

4.6 Flammability Tests

The flammability tests were originally developed to

measure the relative flammability of the finish involved.

The tunnel method has been in use for evaluation of coated

metals for a period of more than ten years. The radiant

panel method, rather recently developed, has only recently

been applied for study of flammability of these materials.

It provides a means for measurement in a quantative fashion

of a much wider range of surface flammability than is

possible with the tunnel method. It was originally believed

that this latter test method would only be suitable for

measurements on flattened sheets of material. Recently,
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however, experiments have been made in which corrugated material was tested. The results obtained seem to indicate

greater flammability in this form and it is considered

desirable to make all future tests of this type of material

in the corrugated form in which it is manufactured.

The results of the flammability tests are presented in

Table 3.

The columns headed Interior and Exterior refer respectively to, tests in which the interior uncoated material of

coated one-side-stock, and either the exterior coated side

of the same stock or one side of stock coated on two sides

were tested.

On the basis of the data developed there appears to be

little to choose between the three materials on the basis

of flammability. The Plasteel product however was consistent in its evidence of the formation of molten bituminous

drippings. In many instances these were flaming as they

fell and continued to burn after coming to rest.

There was considerable difference in the flammability

of the grey colored material as tested by the two different

flammability test methods. In the tunnel there was evidence of coking of the coating material ahead of the flame

front which seemed to have the effect of limiting flame

spread. This effect was not noticed in the radiant panel

test results which seemed to indicate much higher flammability. We at present have no way of predicting which

test method is more indicative of the hazard which might

result from use of a material in a building.
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TABLE

3.

RESULTS

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FLAMMABILITY

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k,7 Fuel Potential Results

The simplified calorimetric method used for measurement

of the heat of combustion of the interior coating of three

coated metals provided the following results:

Only one specimen of each of the coated metals was used in

determining these results. In each case the interior coating

of a nominally coated-one-side sheet was used for study.

The results seem to indicate that the fuel potential on

the interior surface of the Plasteel product is significantly

larger than that of the other two products studied.

The performance ratings, based exclusively on the results

of the accelerated weathering, impact and salt-spray tests,

described in this report are given below. The adjective

ratings are based on the overall performance of each material

in a given test,

5.1 Accelerated Weathering Tests (1000 Hours Exposure)

Galbestos

Plasteel

Steelbestos

304 BTU/ft^

790 •’ 450 "

5. CONCLUSIONS

Plasteel, CP-400

Plasteel, Regular

Galbestos

Steelbestos

Excellent

Excellent

Fair

Poor

5.2 Low-Temperature Impact Test (0°F. and -30°F.)

Galbestos

Steelbestos

Plasteel, CP-400

Plasteel, Regular

Excellent

Good

Fair

Poor
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Galbestos

Plasteel, CP-400

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Plasteel, Regular

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5.4

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Galbe stos

Plasteel, CP-400

Excellent

Fair

Poor

Poor

Steelbestos

Plasteel, Regular

5.5

Abrasion Resistance

No adjective ratings can be made. The material listed first

has the best rating in the respective test.

5 . 5.1 Abrasion Resistance of Coating

5 . 5.2 Abrasion Resistance in Terms of Time to Remove Coating

There appears to be little basis for selection of one

product over others so far as flammability is concerned.

There is however some evidence that the color coatings used

may have the effect of increasing surface flammability over

those of maroon and black coating materials. This effect was

only observed with specimens tested by the radiant panel method.

Plasteel, Regular and CP-400

Steelbe stos

Galbe stos

Galbe stos

Steelbestos

Plasteel, Regular and CP-400

5.6

Surface Flammability
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The Plasteel product exhibited a greater tendency to form

molten bituminous drippings and might be considered inferior

to the others on this score.

5.7 Fuel Potential

Only a few tests of the calorimetric type were performed.

These, however, seemed to indicate the following ordering of

the various products:

Galbe stos

Steelbestos

Plasteel.

6. SUMMARY OF THE RESULTS OF FOUR SERIES OF

TESTS ON PROTECTED METALS

For reference and convenience. Table h is presented to

summarize the results obtained during four series of tests

on various samples of protected metals. The results are

reported in detail in N.B.S. Reports Nos. l808, dated

8/21/52; 4963, dated 12/14/56; 5l48, dated 2/5/57; and

in this report.

The adjective ratings used in the table are, of necessity,

quite broad and we would expect others might interpret the

results of some of the tests differently.
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TABLE

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NATtONAIi HUnKAU Of’ 9TANIMH09

A. V. AfiUit, DlrrcHor THE IVATIOIVAL BBJnEAlJ OE STAIVWAKW.S

The scope of Rctlvitlca of the Notional Bureau of Slnrularrls at its heaH»|Uiirlors in Wnsinnpton,

0. Cm find Us tnajor Inhoratorlcs In Boulder, Colo., is su^pesled in the following listiog *)f the

divisions and sections engoged in tcehnieal work. In geherni, eiuh section eorrn^s out s|>e»;i»dized

research, development, and engineering in the field indiented hy its title. A brief deseripfion of

the activities, and of the resultant puhlicationa, appears on the inside front cover. WASHINGTOIV, W. C.

KlftCtrlcIty nm! Kesistnnee and Reaclanco. Kletitron Devices. Kleelricul In- etrunients. Magnetic Measurements. Dielectrics.. Engineering Electronics. Electronic Instru- mentation. Electrochemistry.

Optics nnd Metrology* Photometry and Colorimetry. Optical Instruments, Photographic

Technology. Length. Engineering Metrology.

float* Temperature Physics. Thermodynamics. Cryogenic Physics. Rheology. Engine Fuels. Free Radicals Research.

Atomic and Radiation Physics* Spectroscopy. Radiometry. Mass Spectrometry. Solid

State Physics. Electron Physics. Atomic Physics. Neutron Physics. Radiation Theory.

Radioactivity. X-rays. High Energy Radiation. Nucleonic Instrumentation. Radiological

Equipment. ' Chemistry* Organic Coatings, Surface Chemistry. Organic Chemistry. Analytical Chemistry,

Inorganic Chemistry. Eleclrodeposltion. Molecular Structure and Properties of Gases. Physical

Chemistry. Thermochemistry, ^pectrbciiemislry. Pure Substances.

Mechanics* Sound. Mechanical Instruments. Fluid Mechanics. Engineering Mechanics. Mass

and Scale. Capacity, Density, and Fluid Meters. Combustion Controls. Organic find FlhrotlN MntcrInlH* Rubber. Textiles. Paper. Leather. Testing and

Specifications. Polymer Structure. Plastics. Dental Research.

Metallurgy* Thermal Metallurgy. Chemical Metallurgy. Mechanical Metallurgy. Corrosion.

Metal Physics.

Mineral Products. Engineering Ceramics. Glass. Refractories, Enameled Metals. Concreting

Materials. Constitution and Microstructure.

Rlllldiug Technology* Structural Engineering. Fire Protection. Air Conditioning, Healing,

and Refrigeration. Floor, Roof, and Wall Coverings. Codes and Safety Standards. Heal Transfer.

Applied MfitllomnticN* Numerical Analysis. Compulation. Stalisticul Engineering. Mathematical Physics.

Data Processing Systems. SEAC Engineering Croup. Components and Techniques. Digital

Circuitry. Digital Systems. Anolog Systems. Application Engineering.

• Office of Basic Instrumentation. * OHico of Weights and Measures. llOULRli^R^ COIARIARO

t’ryogcnic Ihlgineerlllg. Cryogenic E(|iiipment. Cryogenic Proceswis. Properties of Materials, Gas Liquefaction.

Radio l*ropugatioil Physics* Upper Atmosphere Heseareh. lonosi>heiij Research. Regular Propagation Services, Sun-Eartlr Relationships. VUE R(>mu<;h. Ionospheric Comimniiealioii

Systems.

Radio IVopagathm BCligiuccrSiig. Data Reduiaion hislrumiailation. Miultdalion Systems.

Navigation Systems, Radio Noise, Troposplierie Measiireimails. ’I'roposplu'ric Analysis. Radio

Systems Ap|dicution Engineering. Radio-Meteorology.

Rafllo StaiulardN* IligSi I'nspieney I'.lc/elrical iSlamlar<ls, Radio Bromleast Serviei’. High

Frequency Jinpe.danee Slamlards. Ek( tionie. Calihralion (a-nler. Miemwave Pliysies. Microwave

Circuit .Stundurds,
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