These are additives incorporated directly into the polymer matrix during compounding or extrusion. Internal lubricants reduce the internal friction within the polymer melt, improving its flow properties and preventing melt fracture.
External lubricants are applied to the surface of moulds, equipment, or the polymer itself to reduce friction and facilitate the release of the polymer from molds or processing equipment. They can be in the form of powders, liquids, or coatings. Common external lubricants include stearates (e.g., zinc stearate, calcium stearate), silicone-based products, and various release sprays and coatings.
| Chemical Name | CAS No. | Melting Range | Enquiry | |
|---|---|---|---|---|
|
Aluminum Stearate |
637-12-7
|
> 100
|
||
|
Calcium Stearate |
1592-23-0
|
> 147
|
||
|
Ethylene bis-stearamide (EBS)
|
110-30-5
|
> 144
|
||
|
Ethylene vinyl acetate (EVA)
|
24937-78-8
|
> 75
|
||
|
Glycerol Monostearate (GMS) |
31566-31-1
|
> 78
|
||
|
Glyceryl palmitostearate
|
8067-32-1
|
> 50 |
||
|
Lithium Stearate |
4485-12-5
|
> 220 |
||
|
Magnesium Stearate |
557-04-0
|
> 200
|
||
|
Montan wax
|
8002-53-7
|
> 80
|
|
|
|
Paraffin wax
|
8002-74-2
|
> 58
|
||
|
Pentaerythritol tetrastearate
|
115-83-3
|
> 60
|
||
|
Polyethylene wax (PE wax)
|
9002-88-4
|
> 90 |
||
|
Polymethyl methacrylate (PMMA) |
9011-14-7
|
> 150
|
||
|
Polypropylene Wax
|
9003-07-0
|
> 160
|
||
|
Polyvinyl Alcohol (PVA)
|
9002-89-5
|
> 200
|
||
|
Sorbitan monostearate
|
1338-41-6
|
> 55
|
||
|
Zinc Stearate |
557-05-1
|
> 125
|
||
|
Maleic Anhydride Grafted Polyethylene Wax
|
NA
|
|
||
|
Maleic Anhydride Grafted Polypropylene Wax
|
NA
|
|