NATIONAL BUREAU OF STANDARDS REP*

NBS PROJECT NBS Rl

1000-30-4830 August 5, 1953 272

TESTS OF TOO VENETIAN BLINDS

by

0. N. McDortnan

Heating and Air Conditioning Section

Building Technology Division

for

Corps of Engineers

Mobile District

U. S. Army

<NBS>

U. S. DEPARTMENT OF COMMERCE

NATIONAL BUREAU OF STANDARDS

The publication, reprinting

unless permission is obtalne 25.D.C, Such permission

cal ly prepared If that agei

Approved for public release by the

Director of the National Institute of beenspeclfi _ Standards and Technology (NIST) • Its own use. on October 9, 201 5.
»

4*

i

1

«
TiZ.7ZJ' or Tv.U raOTlAH BLIHLo

I. imODUCTIOf!!

In accordance with a request dated July 6, 1953, tests were made

of two complete Venetian "blinds for conformance with Section 4.3 of

Federal Specification PR3- 446 dated 30 June 1950, and the requirements

of Paragraph 1-04 of the Contract Specifications

II . TEST RESULTS

" comcmxn ms mmmt siscxficatios?

The test results showed that the specimens complied with the reqilirerents of Paragraphs 4.3.1, 4.3.2, 4 . 3.3 and. 4.3.5 of the Federal

Specification. Uhder Paragraph 4.3.4, the breaking strength of the tapes

was found to be a little below the ssLnimm Specification requirement of

230 pounds and under Paragraph 4.3.7, the color fastness of the tapes

when, exposed to light was found to be fair' instead of good as required

by the Specification. It should be noted, however, that the color

fastness Is determined by visual estimate and not by my absolute

standard of cor;parison. The results observed daring tests of breaking

strength, shrinkage and color fastness of the tapes, cross straps and

cords are summarised in Table 1.

TABUS 1

TSoTO OF TAPES, CROSS STRAPS, ASff CORK

FOR 3BRI&&A00, ABB COLOR FASTISS3

Tests Results Requirements

Width, in.

side straps (tapes)

• 1 1/2 1 1/2 1/16

cross straps 7/16 3/3 min.

Breaking strength, lb

side straps (tapes) (4.3.4) f 216 »{1) 234 *( 1) 25

250 ©in.

cross straps (Mo) 20 min.

cord (>*.3.3) £23 125 min.

Shrinkage, % 6.7 7 saax. Color fastness

light

(i*. 3-7)

fair *(£) good

water

•», -4.1 «'• good ( 2) good

*F©tls to meet the requirement

(1)

Average of 5 samples.

( 2

)

Visual estiaata.

The samples meat the other requirements
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A salt -spray test -was performed on parts of the Venetian blinds,

in accordance with the requirements of Paragraph 4 . 3.8 of the Federal

Specification. The results and conclusions obtained from the saltspray test ara summarized below.

1. Ten component parts of a Venetian blind were submitted for 100

hour salt-spray test in accordance with Federal Specification *.Q-M-1;>1,

Metals; General Specification for Inspection of.

2. At the conclusion of 100 hours in the salt-spray cabinet the

parts were washed free of salt and loosely adhering corrosion products

and. inspected, the results of the inspection being as follows:

Slats; All slats were in good condition, there being only

slight evidence of rust ©a the ends and in the region

of the cut edges is the cord slots. Very slight evidence

of rust on edges of slats. Slight blistering along edges

and ends and around cord slots on slats. Bemlnder of

surface of slats free from blistering.

Top Sections line plated asecimais® approximately 7> > rusted

but still capable of being operated. Top section in

generally good condition ©accept for slight evidence of

rust on cut edges. -Some slight blistering of paint in

corrugations, at cut edges and at area© of cut-outs.

Blistering slightly more prosit neat than that occurring

on slats. End cap in poor condition due to blistering

and peeling of paint. Unpainted interior surfaces of

end cap slightly rusted.

Bottom Section: This section was in generally good condition,

there being only slight evidence of rusting at- the cutouts and along the loch seam in the interior of the

section. Some feint blistering in areas of forming and

slight deterioration of paint along loch seam on

exterior of section.

3. It is difficult to predict how the subject Venetian blind

will perform in actual service. Inasmuch as it withstood the severe conditions of the 100-hour salt-spray test reasonably well, it might

be expected to perform satisfactorily in normal atmospheres for

reasonably long periods of time. Is coastal atmospheres, where con- ditions might be likened to those in the salt spray at a decelerated

rate, somewhat shorter life is to be expected.

4. The only other tests of a similar nature conducted by this

Bureau were on slats from a Venetian blind, all edges of which had

been coated with a bituminous enamel to preclude their rustic . After 100 hours in the salt spray these slats showed no evidence of

paint failure.

Mo tests were made under Paragraph 4.3.6 of the Federal Specification sluice metal cables- were not used in the specimens submitted.
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Tfee apeeitaan ¥eaet:im blinds were tomid to comply with all parts

of Section i-0t of the Contract Speciftimtiocs, with the following

exceptions;

Par. l-0&(b)i the «A pieces oa the tilt rails were constructed

of plastic instead of natal.

Par. 1~CM3): She bottom mils were 1 1$/l£ inches wide instead

of 2 inches, the openings for the lifting cords were stooped out

instead of being drilled.
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