This procedure measures the resistance to radiant heat flow of insulating materials in sleeve form. The sleeve's effectiveness (S_E) is determined by measuring the difference in surface temperature of a flat black, single-diameter ceramic cylinder with and without the standard diameter sleeve at the specified temperature, position, and distance from the radiant heat source.

Safety—This method may involve hazardous materials, operations, and equipment. This SAE Standard does not address the safety problems associated with its use. It is the responsibility of the user of this document to consult and establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.

Limitations—The temperature measurement range of this procedure is 121 °C to 482 °C. Sleeve size is limited to 19 mm nominal ID and 30 cm ± 2 cm long. The test distance is the shortest measured span from the surface of the radiant heat source to the surface of the ceramic cylinder. Unless otherwise specified, the standard distance is 25 mm ± 2 mm with the cylinder position parallel to and directly above the heat source. This procedure is performed under static (passive) air flow with no vibration. Do not adapt the temperature sequencing as a thermal cycle.

This test method is based on SI units.

Note to Users—Use the appropriate alphanumeric codes to specify temperature condition (Table 1), sequence (Table 2), smoke generation option (see 6.3.2) and sample position (see 6.3.3) when referencing this document. For example, a line code of B(2)S(25)P(3)D(20) after the SAE document number means: Heating to a two-step sequence (B2), first at 121 °C, then 260 °C measuring smoke generation (S) at a level not exceeding 25 s. The sample position (P) is at 3 o'clock, 20 mm (D) from the heat source. Bracket numbers in parentheses.

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