isotactic-polystyrene

polymer

Isotactic-polystyrene (i-PS) is a semicrystalline thermoplastic polymer where the methyl side groups are arranged regularly along the backbone, distinguishing it from atactic polystyrene and making it stiffer and more heat-resistant. It is widely used in injection-molded consumer products, automotive interior components, appliance housings, and medical device casings where modest rigidity and chemical resistance are needed at moderate temperatures. Engineers favor i-PS over standard atactic polystyrene when parts require improved dimensional stability and higher service temperatures, or over engineering thermoplastics when weight savings and low material cost are prioritized over maximum strength.

injection-molded consumer goodsautomotive interior trimappliance housingsmedical device enclosuresfood contact packagingrigid containers and closures

Compliance & Regulations

?UL 94?ITAR?EAR?Conflict Free?RoHS?REACH?TSCA?Prop 65

Units:

si imperial

Property	Value	Unit	Conditions	Source
Glass Transition Temperature(Tg)	194	°F	—

Verified Unverified Low confidence (<80%) Link to source

Regulatory Screening

Environmental

Export Control

Safety & Biocompatibility

Quality & Standards

Industry-Specific

RoHS, REACH, and Prop 65 statuses are validated against official substance lists (ECHA SVHC Candidate List, OEHHA Prop 65, RoHS Annex II). Other regulations are estimated from composition and material classification. All screening is a starting point for due diligence — always verify with your supplier before making compliance decisions.