GMNA GM9009P Test for Volatiles in Silicone Rubber
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GMNA GM9009P Document Information:
Title
Test for Volatiles in Silicone Rubber
General Motors North America
Publication Date:
Jan 1, 1990
Scope:
This test method establishes a procedure to determine the percent
silica-producing volatiles
present in heat cure silicone or one component RTV sealant. Silica
producing volatiles are
contributors to the fouling of oxygen sensor systems used in the
control of vehicle emissions. As a
contributing source of contamination, the volatile potential of
silicone can be accurately
monitored by the use of this procedure. Utilizing this method in
conjunction with a realistic
maximum volatility tolerance level for end use material can help
minimize the risk of oxygen sensor
disfunction.
The procedure consists of 4 basic steps: 1) the silicone is cured to
its elastomeric form, 2) the
volatiles are extracted from the cured material, 3) the extract is
separated and measured by gas
chromatography (GC) and 4) the GC results are quantified using a
siloxane calibration. The volatile
silicones from a commercial silicone are primarily cycle
dimethyl-siloxane. Other species present
having GC retention times similar to those of the cyclics are assumed
to be silicone as well.
Safety.
This method may involve hazardous materials, operations and equipment.
This procedure does not
propose to address all the safety problems associated with its use. Is
the responsibility of the
user of this procedure to establish appropriate safety and health
practices and determine the
applicability of regulatory limitations prior to use.
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