Technical Specifications

Material Technical Specifications

Learn about the Technical Specifications we use to test the sustainability of our products.

Water Absorption

orange icon of a water droplet inside an orange hexagon

Measurement of the absorption of water in a sample, compressed and immersed in water for a given duration

Cell Count & Structure

Orange icon showing cell count and structure - a set of hexagons inside a larger hexagon

For more than 25 years, the cellular structure and the cell size have been defined by the unit “PPI” – Pores per inch. The number of pores is counted on a standard length of 1 inch, however the pore has never been clearly defined – it can be a window or the full section of the cells.

Flammability / Heat Resistance

Flammability technical specification icon - white flame icon inside an orange hexagon

Flame behaviour is measured in different formulas – using a burner with calibrated flame, and also the behaviour of the foam irradiated by a radiator of 500 W for a duration of 20 minutes.

Indentation Load Deflection Hardness

Indentation Load Deflection hardness technical specification icon - arrow pointing to a "load" inside an orange hexagon

ILD is defined as the force required to compress a 380*380*50 mm piece of foam by 40% with a 200 mm diameter compression plate. Recorded in Newtons (N). Some test methods are BS4443 pt 2 method 7, ISO 2439 B.

Compression Deflection Hardness

Compression deflection hardness technical specification icon - arrow pointing to a "load" inside an orange hexagon

CLD is defined as the force required to compress a 100*100*50 mm piece of foam with a 200 mm diameter compression plate. The foam is compressed three times to 70% and then after the third compression, readings are taken at 60%, 40% and 25%. Recorded in kPa. Some test methods are: DIN 53577, ISO 3386/1.

Ultimate Elongation & Tensile Strength

Elongation and tensile strength technical specification icon inside an orange hexagon

Tensile Strength kPa is defined as the maximum force reached at the point of rupture. Elongation % is defined as the measurement of elongation at the rupture point.

Tear Resistance

Orange diagram demonstrating tear resistance - a material being pulled from two directions

Determination of the maximum forces at which the tear rupture takes place. Some test methods: ASTM D 3574/F.


orange icon showing material density being tested in a machine

Density is defined as the mass per unit volume in air; it is measured by dividing the weight of a sample by its volume. Normally recorded in kg/m³ however the USA record theirs in lb/ft³ (to convert lb/ft³ to kg/m³, multiply the Lbs * 16). Some test methods used – ASTM D3574-91, BS4443, Din53420, ISO 845.

This information is for general guidance only and may contain inappropriate information under particular conditions of use. All recommendations and suggestions are therefore made without guarantee. Samples will be provided on request to enable customers to satisfy themselves as to the sustainability of the product for any specific purpose and to access the product under their own working conditions.