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Description / Abstract:
This method of test is applicable only to asphaltic products
derived from petroleum and should not be applied to natural
asphalts containing nonbituminous matter insoluble in xylene.
Materials, which by use of standard solvent are classed as
positive, may be further tested to determine their degree of
positiveness by means of their "xylene equivalent." The xylene
equivalent shall be the lowest percentage by volume of xylene in a
solvent composed of xylene and standard naphtha or xylene and
normal heptane, as specified, that produces a "negative spot" for
the material in question. These shall be known as the
"naphtha-xylene equivalent" and "heptane-xylene equivalent,"
respectively. The percentage of xylene in the solvents shall be
stated in even 5.0 percent increments. When neither xylene
equivalent is specified, the standard naphtha only shall be used as
the solvent.
The values stated in SI units are to be regarded as the
standard.
This standard does not purport to address all of the safety
concerns, if any, associated with its use. It is the responsibility
of the user of this standard to establish appropriate safety and
health practices and determine the applicability of regulatory
limitations prior to use.