What it does
The most common bismaleimide. Antireversion agent in sulfur systems, co-agent in peroxide systems; improves heat and dynamic resistance.
Compatible rubbers
NRSBRBREPDMNBRCR
Typical properties
Appearance
Yellow powderMelting point
≥ 198 °CP marked values are PubChem literature data (pure substance). Others are typical commercial specifications and vary by producer and grade [TO BE VERIFIED].
Typical dosage
0.5–2.0 phr [TO BE VERIFIED]
FAQ
What does PDM (HVA-2) do in a sulfur system?It counteracts the reversion caused by breakage of polysulfide bonds in prolonged or high-temperature cure. It forms carbon-carbon crosslinks between broken chains and reduces heat build-up in dynamic parts.
What is the role of PDM in peroxide cure?As a co-agent, it reacts with peroxide radicals. It increases crosslink efficiency and density; it improves heat resistance in EPDM and specialty rubbers.
Related guides
Conventional, semi-EV and EV sulfur systems
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Sources: General rubber chemistry literature