... ,viscous liquid, mainly usded for dispersant,emulsifier,detergent Etc. Low Molecular Weight Polyisobutylene (High Reactive Type) TrademarkIndex UNIT Test Method HRD ... -10HHRD-13HHRD-24HMnAverage Molecular Weight Mn GPC100013002300 Distribution GPC≤2.0≤2.0≤2 ... -6181≤4≤4≤4Na.K.FeppmASTM D2849222 HRD-13H Low Molecular Weigh Polyisobutylene