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Industry standard specification for Styrene monomer
Property Units Min Max Method
Purity %m/m 99.7   ASTM D5135
p-TBC (inhibitor) mg/kg 10 15 ASTM D4590
Polymer Content mg/kg   10 ASTM D2121
Aldehyde as Benzaldehyde mg/kg   200 ASTM D2119
Peroxides as H2O2 mg/kg   100 ASTM D2340
Color, Pt-Co Scale     10 ASTM D1209

Styrene monomer is inhibited with para-tertiary-butylcatechol, abbreviated as p-TBC. Special quality requirements can be made upon agreement.