[Code of Federal Regulations]
[Title 30, Volume 1]
[Revised as of July 1, 2002]
From the U.S. Government Printing Office via GPO Access
[CITE: 30CFR7.47]

[Page 21]
 
                       TITLE 30--MINERAL RESOURCES
 
  CHAPTER I--MINE SAFETY AND HEALTH ADMINISTRATION, DEPARTMENT OF LABOR
 
PART 7--TESTING BY APPLICANT OR THIRD PARTY--Table of Contents
 
                      Subpart C--Battery Assemblies
 
Sec. 7.47  Deflection temperature test.

    (a) Test procedures. (1) Prepare two samples for testing that 
measure 5 inches by \1/2\ inch, by the thickness of the material as it 
will be used. Prior to testing, condition the samples at 
73.4 3.6  deg.F (232  deg.C) and 
505% relative humidity for at least 40 hours.
    (2) Place a sample on supports which are 4 inches apart and immersed 
in a heat transfer medium at a test temperature range of 65  deg.F-80 
deg.F (18.3  deg.C-26.7  deg.C). The heat transfer medium must be a 
liquid which will not chemically affect the sample. The testing 
apparatus must be constructed so that expansion of any components during 
heating of the medium does not result in deflection of the sample.
    (3) Place a temperature measuring device with an accuracy of 1% into 
the heat transfer medium within \1/8\ inch of, but not touching, the 
sample.
    (4) Apply a total load, in pounds, numerically equivalent to 11 
times the thickness of the sample, in inches, to the sample midway 
between the supports using a \1/8\ inch radius, rounded contact. The 
total load includes that weight used to apply the load and any force 
exerted by the deflection measurement device.
    (5) Use a deflection measuring device with an accuracy of 
.001 inches to measure the deflection of the sample at the 
point of loading as the temperature of the medium is increased at a 
uniform rate of 3.6.36  deg.F/min. (20.2  deg.C/
min.). Apply the load to the sample for 5 minutes prior to heating, to 
allow compensation for creep in the sample due to the loading.
    (6) Record the deflection of the sample due to heating at 180  deg.F 
(82  deg.C).
    (7) Repeat steps 2 through 6 for the other sample.
    (b) Acceptable performance. Neither sample shall have a deflection 
greater than .010 inch at 180  deg.F (82  deg.C).

[53 FR 23500, June 22, 1988; 53 FR 25569, July 7, 1988; 60 FR 33723, 
June 29, 1995]

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