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Fire performance
ISOTHERM complies with SANS 10400, the application of the national building regulations, as an insulation material.

Tested in accordance with SANS 428: fire performance classification B/B 1/2.
ASTM – E 84: spread of flame: nil.
BS 5803 part 4: does not smoulder.
Test reports available on request.
For further information contact Brits Nonwoven.

ASTM – E84:
spread of flame = 0
smoke index = 160
smoke toxicity = < 1 (low toxicity)
*SANS 10400 – 1990 The application of the national building regulations.

View our Fire test video

Chemical and physical properties
Composed of polyester.

The relatively high melting point of polyester fibres gives ISOTHERM good thermal stability.

Moisture absorption: ISOTHERM does not absorb more than 2% (by mass) of moisture, which is within the limits set by the standard.
*Tested in accordance with SANS 1381: Part I (Materials for thermal insulation of buildings).

Performance (R-Values)
The R-Value is the measure of an insulation product's ability to restrict heat transfer. The R-Value is therefore indicative of an insulation product's thermal insulation performance.

The higher the R-Value the better the performance and effectiveness of the insulation product.

The R-Value of ISOTHERM is dependent on the thickness selected.

Up R-Values
This is the resistance to the upward flow of heat; sometimes referred to as "winter" R-Values or warming.

Down R-Values
This is the resistance to the downward flow of heat; sometimes referred to as "summer" R-Values or cooling.

Total R-Values
This is the total thermal resistance provided by a roof or ceiling assembly and /or wall, including the insulation material.

Total R-Values are the best indicators of performance.

ISOTHERM R-Values
40 mm – 0.88
50 mm – 1.10
75 mm – 1.65
100 mm – 2.20

See TIASA map re Climatic Zones