The extensive Gneebio PIB line ranges from low viscosity/ low molecular weight grades to high viscosity/ high molecular weight grades. These products are non-toxic, and are NSF registered to comply with all requirements for cosmetics and food grade applications.
Molecular Weight Grades of Polyisobutylene (PIB)
| PIB Grade | Average Molecular Weight (g/mol) | Physical Form | Typical Viscosity (100°C) | Key Characteristics | Common Applications |
|---|---|---|---|---|---|
| Low Molecular Weight PIB | 300 – 2,300 | Clear viscous liquid | 30 – 1,000 cSt | Excellent fluidity, good solvency, low volatility | Fuel detergents, dispersants, plasticizers, lubricant additives |
| Medium Molecular Weight PIB | 2,300 – 100,000 | Highly viscous liquid / semi-solid | 1,000 – 100,000 cSt | Strong tack, good flexibility, oil compatibility | Pressure-sensitive adhesives, sealants, caulks, rubber modification |
| High Molecular Weight PIB | 100,000 – 2,500,000 | Solid / rubber-like | Extremely high | High elasticity, low gas permeability, strong cohesion | Chewing gum base, butyl rubber modification, inner liners, specialty elastomers |
How to Choose the Right PIB Molecular Weight?
- Fuel and lubricant applications typically require low molecular weight PIB.
- Adhesives and sealants benefit from medium molecular weight PIB.
- Rubber and elastomer applications demand high molecular weight PIB for elasticity, strength, and impermeability.
Selecting the correct molecular weight grade ensures consistent processing, improved performance, and cost efficiency in industrial formulations.