Polyisobutylene

Polyisobutylene（CAS#9003-27-4）, commonly abbreviated as PIB, is a non-toxic polymer presented as water-white viscous material. Its low glass transition temperature grants the product outstanding flexibility even under low-temperature working environments. As a linear saturated polymer built upon highly flexible molecular chains, PIB possesses remarkable extensibility and elastic characteristics. This material exhibits outstanding overall chemical stability, and manufacturers can adjust its molecular weight to customize grades that satisfy different industrial scenarios. Its kinematic viscosity measured at 100°C ranges from 5 cSt to 4,700 cSt, which is directly governed by molecular weight. Generally, products with higher molecular weight deliver stronger surface tackiness for end formulations.

Physical Properties

Form: Liquid or semi-solid state, subject to molecular weight variations 

Color: Water-white to pale yellow 

Odor: Faint characteristic odor or completely odorless 

Viscosity: Varies with molecular weight; standard range from 5 to 4,700 cSt at 100°C 

Density: Approximately 0.92 g/mL at 25°C 

Solubility: Soluble in hydrocarbons, aromatic compounds, gasoline, cycloalkanes, mineral oils, chlorinated hydrocarbons and carbon disulfide; partially soluble in higher alcohols and ester compounds; insoluble in water, short-chain alcohols including methanol, ethanol and isopropanol, ethylene glycol, ketones such as acetone, as well as glacial acetic acid.