Brown Factice (Sulfur-Vulcanized Oil Extender)
Brown Factice is produced by vulcanizing vegetable oil (typically rapeseed or linseed oil) with sulfur at elevated temperatures, resulting in a rubber-like solid that acts as a non-reinforcing extender and processing aid. It improves extrusion smoothness, reduces die swell, and imparts a greasy texture to uncured rubber compounds. Brown factice is widely used in erasers, cable insulation, and sponge rubber to improve extrusion behavior and compound softness.
Technical Specifications
| ash (%) | ≤1.5 |
| appearance | Dark brown irregular pieces or powder |
| moisture (%) | ≤1.0 |
| sulfur content (%) | 20–25 |
| acetone extract (%) | ≤12 |
| Mooney viscosity ML(1+4) 100°C | N/A (non-thermoplastic) |
Applications
- Pencil erasers and stationery rubber goods
- Cable insulation rubber extrusion
- Sponge and cellular rubber compounds
- Soft rubber and general goods processing aid
- Masterbatch extender for soft rubber compounding
Key Features
- Reduces die swell and improves extrusion smoothness
- Non-reinforcing extender for soft rubber formulations
- Imparts consistent soft, smooth texture to uncured compounds
- Cost-effective extender derived from renewable vegetable oil
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