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Applications

EPP is being used increasingly in applications both in Australia and overseas, particularly in the automotive industry where a ‘common’ polymer type is preferred in order to make the recycling of vehicles easier in the future. Polypropylene is widely used in vehicle bumpers, interior trim parts, wheel liners, and carpet yarns.

EPP is fast becoming a material of first choice for lightweight, high performance, chemical resistance and sound improvement properties.

Locally, RMAX EPP has been used in computer packaging, automotive packaging dunnage and surfboard cores.

RMAX is the largest supplier of EPP in the Australian EPP market.

Material Comparison of Some Mouldable Expanded Engineering Foams

Item

PP
Expanded
Poly- Propylene

PE
Expanded
Poly Ethylene

PS
Expanded Polystyrene

PE / PS
Copolymer

PS / PPO
Polystyrene/ Polyphenyl Oxide Copolymer

Compressive strength

Good

Good

Very Good

Very Good

Very Good

Repeated compression strength

Good 

Very Good 

Poor

Poor 

Poor

Tensile strength

Very Good

Very Good

Poor 

Poor  

Poor

Flame resistance

Very Good

Good 

Poor

Poor 

Poor

Heat resistance

Very Good

Good

Poor

Poor 

Good

Thermal deformation

Very Good

Good

Poor 

Medium

Medium

Chemical resistance

Very Good 

Very Good

Poor

Poor 

Poor

Weather resistance

Very Good

Very Good 

Poor

Medium

Poor

Dimensional stability

Very Good

Good

Very Good

Very Good

Very Good

Frictional noise

Very Good

Very Good

Poor

Poor 

Poor

 

EPP Chemical Resistance

Test method: Dropped 0.3 - 0.5ml of each chemical reagent on the test piece surface and held sample for 4 hours. Wiped with a cloth and observed the surface appearance.

Criterion: No significant impact.

Reagent Density 60 g/l Density 30 g/l
Petrol none none
Light oil none none
Engine oil   none none
Transmission fluid none none
Grease none none
3%Sol. H²SO none none
Paint protection agent none none
Car wax none none
Window washer solution none none
Soap none none
Paint primer none none

 

Moisture Resistance

Test method: After maintaining the test piece at 50ºC, 98%RH for 48 hours the test piece is held at room temperature, 60%Relative Humidity for 24 hours and observed for any change.

Criterion: No significant impact on test piece.

Test results: Density 60g/l and 30g/l – No change of its appearance, test piece dimensions and physical properties.

Water Absorption

Test method: The test piece (100mm x 100mm x 50mm) is held in water at 50mm depth using mesh. After keeping it for 24 hours, it is placed into + 95% solution of alcohol for 5 seconds and dried for 5 minutes with 60ºC air and measured its weight. Observed for appearance change and calculated coefficient of water absorption.

Criterion: No significant impact.

Test Criteria Density 60 g/l Density 30 g/l
Appearance change none none
Dimensional change none none
Coefficient of water absorption 0.0005g/cm3 0.006g/cm3

EPP Automotive Focus