General Purpose Polystyrene, often referred to in its acronym form GPPS, is made from a styrene monomer polymer through a process of suspension. It is a solid product that is generally see through and compressed in granule form to produce a range of products. It is has a high gloss finish and is clear.
General Purpose Polystyrene is relatively strong and weather resistant. The material flows easily, making it perfect for usage in moulds with end products such as toys, CD cases, hangers, and plastic cups. Polystyrene is used in applications such as IT equipment, clear jewel boxes and other types of enclosures.
The General Purpose Polystyrene is also used for the manufacturing of disposable medical products such as test tubes, test kits housing, diagnostic products, Petri-dishes, and tissue trays. Bath accessories and garden equipment are also made from GPPS. As such the application range of this type of polystyrene is extensive.
Other types include:
- High-Density Polyethylene
- High Impact
- Low-Density Polyethylene
- Polypropylene
- Ethylene Vinyl Acetate
- Linear Low-Density Polyethylene
- Copolymer
High Density
High-Density Polyethylene is used in the making of household items such as containers, caps, and bags. The material is used in injection, blow and rotational moulding. It is robust, easy to process, and has a high gloss finish.
High Impact
As opposed to General Purpose Polystyrene, the High Impact Polystyrene contains rubber and is used in the making of products that must be impact resistant and the transparency is less than with GPPS. The material has a standard flow, is glossy but less than GPPS, is crack resistant and is used in injection moulding. Applications include that of sheets for freezers.
Low Density
Low-Density Polyethylene is used in the construction and agricultural industries in the form of a thin film. Products made from this type of polyethylene include packaging for frozen foods, t-shirt bags, textile packaging and laminating film.
Polypropylene
Polypropylene is used for many applications. It can be injected as well. The material is used for products such as enclosures and toys. It is characterized by its strength, processing attributes, and glossy finish.
Ethylene Vinyl Acetate
The material is used in moulding processes and hot melting adhesive applications.
Linear Low-Density Polyethylene
It is a blown film that can also be blended with other resins. Applications range from ice bags to lids, containers, vehicle parts and toys. It can handle low temperatures well and has a high gloss finish.
Copolymer
It is used for the making of lids and clear enclosure products. It is stiff and clear. The material is generally used in the making of hard consumer goods.
As can be seen from the above information provided, General Purpose Polystyrene and related types are used for a wide variety of applications. The cost-effectiveness of production, ease of storage, and moulding characteristics make the material versatile and recycling of such products becomes all the more important. Without polystyrene, many of the disposable and household products of today would not have been available.
(High Flow (PSM 123
| TECHNICAL SPECIFICATION |
| PROPERTIES UNIT VALUE STANDARD |
| Tensile Strength(Yield) kg/cm2 400 D-638 |
| Tensile Modulus of Elasticity kg/cm2 2.5×104 D-638 |
| Izod Impact Strength kg-cm/cm 2.0 D-256 |
| Vicat Softening Point oC 91 D-1525 |
| Melt Index g/10 min 30 D-1238 |
| ,Main Applications Housewares ,Food Containers .Toys, etc |
(Normal Flow (PSM 134
| TECHNICAL SPECIFICATION |
| PROPERTIES UNIT VALUE STANDARD |
| Tensile Strength(Yield) kg/cm2 450 D-638 |
| Tensile Modulus of Elasticity kg/cm2 2.6×104 D-638 |
| Izod Impact Strength kg-cm/cm 2.1 D-256 |
| Vicat Softening Point oC 98 D-1525 |
| Melt Index g/10 min 10 D-1238 |
| ,Main Applications Housewares ,Containers, Toys Office Stationary, etc |
(High Strength & High Cycle (PSM 134
| TECHNICAL SPECIFICATION |
| PROPERTIES UNIT VALUE STANDARD |
| Tensile Strength(Yield) kg/cm2 440 D-638 |
| Tensile Modulus of Elasticity kg/cm2 2.6×104 D-638 |
| Izod Impact Strength kg-cm/cm 2.4 D-256 |
| Vicat Softening Point oC 92 D-1525 |
| Melt Index g/10 min 9 D-1238 |
| ,Main Applications Thin Wall Food Containers ,(.Medical Ware (Petri Dishes etc .Office Stationary, Housewares, etc |
(High Heat for PS Foam (PSM 145 & 153
| TECHNICAL SPECIFICATION |
| PROPERTIES UNIT VALUE STANDARD |
| Tensile Strength(Yield) kg/cm2 480 D-638 |
| Tensile Modulus of Elasticity kg/cm2 2.7×104 D-638 |
| Izod Impact Strength kg-cm/cm 2.5 D-256 |
| Vicat Softening Point oC 99 D-1525 |
| Melt Index g/10 min 1.8 D-1238 |
| ,Main Applications Parts for large Home Electrical Appliances Name Plates, Transparent Display ,(Covers for VTR, etc .Office Stationary, Foamed PS, etc |
(High Strength & Good Moldability (PSM 155
| TECHNICAL SPECIFICATION |
| PROPERTIES UNIT VALUE STANDARD |
| Tensile Strength(Yield) kg/cm2 480 D-638 |
| Tensile Modulus of Elasticity kg/cm2 2.7×104 D-638 |
| Izod Impact Strength kg-cm/cm 2.5 D-256 |
| Vicat Softening Point oC 99 D-1525 |
| Melt Index g/10 min 1.8 D-1238 |
| , Main Applications Parts for large Home Electrical , Appliances (Dust Cover , Illuminating Equipment Covers (.Crispers for Refrigeration, etc |