[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: 30CFR35.22]

[Page 164-165]
 
                       TITLE 30--MINERAL RESOURCES
 
  CHAPTER I--MINE SAFETY AND HEALTH ADMINISTRATION, DEPARTMENT OF LABOR
 
PART 35--FIRE-RESISTANT HYDRAULIC FLUIDS--Table of Contents
 
                      Subpart B--Test Requirements
 
Sec. 35.22  Test to determine effect of evaporation on flammability.

    (a) Purpose. The purpose of this test shall be to determine the 
effect of evaporation on the reduction of fire resistance of a hydraulic 
fluid.
    (b) Description of apparatus--(1) Petri dish. Standard laboratory 
Petri dishes, approximately 90 mm. by 16 mm., shall be used to contain 
the test samples.
    (2) Oven. A gravity convection air oven, capable of maintaining the 
specified evaporation temperature constant within 2  deg.F., 
shall be used in the test.
    (3) Pipe cleaner. An ordinary smoker's pipe cleaner (U.S. Tobacco 
Co., Dill's or equivalent) shall be used in the test procedure, 
described in paragraph (c) of this section.
    (c) Test procedures. (1) Three 30-milliliter samples of the fluid 
shall be placed in uncovered Petri dishes. Two of these samples shall be 
inserted in the oven, that shall have been heated to a temperature of 
150  deg.F., 2  deg.F., which shall be maintained throughout 
this test. The third sample shall remain at room temperature.
    (2) An electrically operated cycling device, such as an automobile 
windshield wiper mechanism, shall be oscillated in a horizontal plane, 
252 cycles per minute. A pipe cleaner shall be attached to 
the device so that it will enter and leave a flame of a standard (Bunsen 
or equivalent) laboratory burner, which is adjusted to provide a 
nonluminous flame approximately 4 inches in height without forming a 
sharp inner cone. The cycling device shall be so arranged that when a 2-
inch length of pipe cleaner is attached thereto the exposed end shall 
describe an arc with a radius of 4 inches \1/8\ inch. The 
cycling device shall be so arranged that when the 2-inch length of pipe 
cleaner is attached thereto, its midpoint shall be in the center of the 
flame at one extreme end of the cycle.
    (3) Each of five 2-inch lengths of pipe cleaner shall be soaked 
separately for a period of 2 minutes in the test sample that remained at 
room temperature. Each pipe cleaner shall then be removed from the test 
sample and permitted to drain freely until all excess fluid is expelled 
from it. Each soaked pipe cleaner shall be attached to the cycling 
device, the mechanism started, and the pipe cleaner permitted to enter 
and leave the burner flame, as described in paragraph (c) (2) of this 
section, until a self-sustaining flame shall be observed on the pipe 
cleaner. The number of cycles necessary to obtain a self-sustaining 
flame shall be noted and averaged for each of the five soaked pipe 
cleaners.
    (4) After one test sample has remained in the oven for a period of 2 
hours, the Petri dish containing it shall be removed from the oven and 
allowed to cool to room temperature, after which 5 lengths of 2-inch 
pipe cleaner shall be soaked separately in

[[Page 165]]

the test sample for a period of 2 minutes. Then the test procedure 
stated in paragraph (c) (3) of this section shall be repeated.
    (5) After one test sample has remained in the oven for a period of 4 
hours, the Petri dish containing it shall be removed from the oven and 
allowed to cool to room temperature, after which 5 lengths of 2-inch 
pipe cleaner shall be soaked separately in the test sample for a period 
of 2 minutes. Then the test procedure stated in paragraph (c) (3) of 
this section shall be repeated.
    (d) Appraisal of tests. To be determined as fire resistant according 
to the test requirements of this section, the three following results 
shall be achieved:
    (1) The average number of cycles before attaining a self-sustaining 
flame in the test described in paragraph (c) (3) of this section shall 
be 24 or more.
    (2) The average number of cycles before attaining a self-sustaining 
flame in the test described in paragraph (c) (4) of this section shall 
be 18 or more.
    (3) The average number of cycles before attaining a self-sustaining 
flame in the test described in paragraph (c) (5) of this section shall 
be 12 or more.