ASTM D1181-56(1971)

Method of Test for Warpage of Sheet Plastics (Withdrawn 1979)

General Information

• Status: Withdrawn
• Technical Committee: D20 - Plastics

Standards Content (Sample)

AMERICAN NATIONAL ANSI! ASTM D 1181 - 56 (Reapproved 1971)
STANDARD
Standard Test Method for
1
WARPAGE OF SHEET PLASTICS
This Standard is issued u~der the. fixed designatio~ ~ 118 l; the nUflb~~ ~:~i:~at%yn~~lb:/i; ~~~e~~~i!s~~t:~~i~~~!~:h~
the year of original adoptIOn or, 10 the case of reVISIon, t he year 0 a .
year of last reapproval.
This method has been approved for use by agencies of the Dep~rtme.nt of Defense to replace method 6054 of Federal Test
Method Standard 406 and for listing in the DoD Index of SpecificatIons and Standards.
1. Scope one IS by IS-cm (7 by 7-in.) testing surface
ground flat to ±0.013 mm (±0.OO05 in.).
1.1 This method covers the determination
of the dimensional distortion of sheet plastic
4. Test Specimens
specimens resulting from exposure to service
4.1 The test speci mens shall be not less
conditions. In particular, the method is suita­
than 10 cm (4 in.) nor more than 15 cm (6 in.)
ble for measuring warpage such as that de­
square, and shall be of uniform thickness . In
veloped in accordance with the conditions
practice, specimens 10 by 10 cm (4 by 4 tn.)
described in ASTM Methods 0 756, Test for
by the full thickness of the material are rec­
Resistance of Plastics to Accelerated Service
ommended, although the measuring device is
2
Conditions.
capable of measuring a 15 by 15-cm (6 by
NOTE I-The values stated in SI units are to be
6-in.) specimen.
regarded as the standard.
S. Conditioning
2. Significance
5.1 Conditioning-Condition the test speci­
2.1 This procedure is intended only as a
mens at 23 ± 2 C (73.4 ± 3.6 F) and 50 ±
convenient method for determination of di­
5 percent relative humidity for not less than
mensional distortion in sheet plastics, either
40 h prior to test in accordance with Pro­
when subjected to conditions of test such as
cedure A of ASTM Methods 0 618, Con­
are outlined in Procedure E of Methods
ditioning Plastics and Electrical Insulating
D 756, or "as received" from a supplier. It is
2
Materials for Testing, for those tests where
not applicable to specimens less than 1.3 mm
conditioning is required. In cases of disagree­
(0.050 in.) in thickness, or where the span to
ment , the tolerances shall be ± I C (± I.S F)
be measured exceeds 21.5 cm (8.5 in.).
and ±2 percent relative humidity.
5.2 Test Conditions-Conduct tests in the
3. Apparatus
Standard Laboratory Atmosphere of 23 ± 2 C
3.1 Dial lndicator-A 0-50-0 dial indica­
(73.4 ± 3.6 F) and 50 ± 5 percent relative
3
tor (Fig. 1) equipped with spindle extension
humidity, unless otherwise specified in the
(brass or alumir,um) 3.2 mm (0.125 in.) in
test methods or in this specification. In cases
diameter, mounted in a small stainless steel
of disagreements, the tolerances shall be
block which shall be machined to slide later­
± I C (± I.S F) and ±2 percent relative
ally on a stainless steel bar. This bar s~all be
equipped with two supports, one statIonary
and the other movable. Machining shall be of 1 This method is under the jurisdic.tion of AST!'vf. ~om­
mittee 0·20 on Plastics and is the direct res,?onslblhty of
such precision that movement of the indica­
Subcommittee 0-20.50 on Permanence Properties.
tor, while the jig is on the test plate surface, Current edition effective
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