GMS (Glycerol Monostearate) is a versatile additive used in plastic film production as a slip agent, anti-block agent, and internal lubricant. It helps reduce film surface friction, prevents layer adhesion, and improves extrusion and molding efficiency. GMS is widely used in polyolefins, PVC, and engineering plastics.
| Property | Typical Value |
|---|---|
| Appearance | White powder or flake |
| Monoglyceride Content | ≥ 90% |
| Acid Value | ≤ 5 mg KOH/g |
| Iodine Value | ≤ 3 g I₂/100g |
| Melting Point | 60 – 70 °C |
| Moisture | ≤ 2.0% |
| Common Issues | GMS Solutions |
|---|---|
| High COF in film winding | Provides surface lubrication and slip |
| Film adhesion or blocking | Reduces surface tension and contact |
| Melt instability in extrusion | Acts as internal lubricant, improving flow |
| Die build-up or gel formation | Minimizes deposits and stabilizes output |
Q1: Is GMS compatible with food contact applications?
Yes, food-grade GMS is available and used in food packaging films.
Q2: What’s the typical dosage?
Usually between 0.3% – 1.5%, depending on the polymer and processing conditions.
Q3: Can GMS affect film clarity?
Yes, higher loading may cause slight haze. It’s best suited for opaque or matte films.
