Back to catalogue

Polystyrene Insulation

Polystyrene (EPS) is a lightweight organic cellular plastic insulation material . This microcellular closed cell construction provides EPS with excellent insulating and shock absorbing characteristics with a high strength to weight ratio. Sheet EPS is cut from a primary block measuring 5.025m x 1.225m x .525m thick.

Product Flyer

Features and Benefits of EPS

EPS is an inert, organic material that will not rot
EPS is dimensionally stable after kiln drying and will not shrink or sag over time.
EPS will last the life of buildings without physical damage.
It has been used throughout the world for over 50 years.

EPS Sheet Sizes

For our standard sheet size we offer 2500 x 1200 x thickness required.

An option of 2400 x 1200 x thickness, or any length of sheet, can be supplied up to 5 metres (5000mm)

Properties of Various Classes of EPS. AS1366. Part3,1992.


Physical Property	Unit	SL	S	M	H	VH	Test Method
Density	kg/m³	12	15	20	24	28
Compressive stress at 10% deformation (min.)	kPa	70	85	105	135	165	AS 2498.3
Cross-breaking strength (min.)	kPa	135	165	200	260	320	AS 2498.4
Rate of water vapour transmission (max.), measured at 23°C	mg/m²s	630	580	520	460	400	AS 2498.6
Dimensional stability of length, width, thickness (max.) at 70°C dry condition, 7 days	%	1	1	1	1	1	AS 2464.5
Thermal resistance at a mean temperature of 25°C: R-value at 50 mm thick	m²·K/W	1.25	1.32	1.35	1.39	1.42	AS 2122.1
Flame propagation characteristics	s	2	2	2	2	2
Medium flame duration (max.)	s	3	3	3	3	3
Eighth value (max.)	%	18	22	30	40	50
Median volume retained	%	15	19	27	37	47
Eighth value (min.)