State average and peak field or power density, pulse duty, exposure duration, hot-spot position, airflow and the temperature reference. A short maximum field and a continuous service limit are not interchangeable, and absorbed RF energy must leave through the declared material and mounting geometry.
Add humidity, chemicals, UV, flame, smoke, particle shedding, compression set and vacuum requirements only where the installation needs them. For vacuum, require TML and CVCM evidence for the exact absorber, adhesive, coating and cure; a similar formulation or an uncured component is not a substitute.
Reject material when the supplier cannot tie the rating to a test condition, when the adhesive has no matching environment evidence, or when measured temperature exceeds the stated service limit. Send the waveform, area, airflow, temperature cycle and qualification standard with the RFQ so the thermal and material boundaries can be checked together.