Styrene (HIPS)

"HIPS" sheet is a thermoplastic, produced from Styrene monomers and various impact modifiers. It is available with a matt or high gloss surface. Excellent forming characteristics make it an ideal choice for vacuum forming, packaging and screen printing applications.

Product range:
City Plastics carry a variety of standard sheet sizes and thicknesses, with an option of custom made sizes and colours available, which are subject to minimum order quantities.
Ex stock colours include black and whites in the standard finish of high gloss one side and matt the other. Special colours, surface finishes and UV additives are available, which are subject to a minimum order quantity.

Product features:
Excellent thermoforming characteristics, good impact strength, approved - food safe, good rigidity and low temperature toughness, excellent printability.

Typical applications:
Graphic arts, signs, packaging, cutlery trays, take away food containers, margarine tubs, cups and lids, point of sale displays.

Fabrication:
Cutting & Guillotining: A circular saw blade with carbide teeth utilising the triple chip tooth design is preferred for thicker gauges. Laser cutting and routing are also successful. Other suitable methods for cutting Styrene sheet include guillotining and punching. Guillotining produces straight-edged cuts, while blanking dies and punches can produce a wide variety of shapes.
Drilling: For drilling, use conventional drill bits with the standard drill angles and a negative rake.
Forming: High impact polystyrene can be thermoformed using typical strip heating and vacuum forming equipment. No pre drying of the material is required.
Decorating: High impact polystyrene can be screen-printed using inks specifically formulated for HIPS. Vinyl graphics can also be applied using typical application methods.
Cementing: High impact polystyrene can be successfully bonded using Weldon 3 and 16.

Typical properties of PVC

 ASTM Test
      Propert
 Value
 
 
 Physical
 
 D792 Specific gravity
 1.05
 D570 Water absorption, 24 hoursm 3.0mm think (%)
 0.1
 ºC Maximum service temp
 +70
 ºC Minimum service temp
 -50
 D1238 Melt flow index
 4(200°C)
 Mechanical
 
 D638 Tensile strength at yield N/mm2
30
 D638 Elongation at yield (%)    
3
 D638 Tensile strength at break N/mm2
35
 D638 Elongation at break(%)
40


Impact strength mj/mm2

No Break
 D256
Notched impact strength mj/mm2
Ball indentation hardness N/mm2
8
80
 D790
Flexural strength N/mm2
52
 D638
Modulus of elasticity N/mm2
2100



Thermal


C177
Thermal conductivity at 20°C
0.17
D696
Coefficient of thermal expansion K-1.10-4
0.9
D648
Deflection temperature °C
89
D1525
Vicat softening temperature °C
89



Electrical


D150
Dielectric constant At 1kHz
2.5
D150
Dissipation loss factor At 1kHz
0.0001
D257
Volume resistivity (ohm-cm)
10.16
D257
Surface resistancy (ohm)
10.13



Fabrication



Welding temperature °C
220

Forming temperature °C
150

These values are representative of those obtained under standard ASTM conditions and should not be used to design parts which function under different conditions.

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