ASTM E285-08 Method Oxyacetylene Ablation Testing of Thermal Insulation Meterials
ASTM E285-08 test method measures and describe the properties of materials, products, or assemblies in response to heat and flame under controlled laboratory conditions. The conditions generated by the oxyacetylene heat source in this test method represent only one set of conditions; they do not simulate any specific application.... Read More
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ASTM E285-08 Method Oxyacetylene Ablation Testing of Thermal Insulation Meterials
ASTM E285-08 test method measures and describe the properties of materials, products, or assemblies in response to heat and flame under controlled laboratory conditions. The conditions generated by the oxyacetylene heat source in this test method represent only one set of conditions; they do not simulate any specific application.
Scope:
ASTM E285-08 test method covers the screening of ablative materials to determine the relative thermal insulation effectiveness. This test method is used to measure and describe the properties of materials, products, or assemblies in response to heat and flame under controlled laboratory conditions.
Test Procedure:
In ASTM E285-08test method, hot combustion gases are directed along the normal to the specimen until burn-through is achieved. The erosion rate of the material is determined by dividing the original thickness by the time to burn-through. The insulating effectiveness isdetermined from back-face temperature measurements. Insulation index numbers are computed by dividing the times for temperature changes of 80°C, 180°C, and 380°C, from the initial ambient temperature, by the original thickness. The insulation to- density performance is computed by dividing the insulation index by the density of the panel.
Figure 1: Schematic Diagram of Gas System
Specimen size:
The test specimen shall be a square, flat panel 6.35±0.41 mm (0.250 ±0.016 in.) thick.
The dimensions of length and width shall both be 101.6°+0.0°, -0.71mm (4.000+0.000, -0.028in.).
Data:
The general characteristics of the oxyacetylene heat source are:
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