In infrared heating devices, materials with high infrared transmittance, such as glass, or materials with high infrared reflectance, such as gold-plated films, require indirect heating due to significantly reduced heating efficiency from infrared radiation. For example, plate glass samples or plate-shaped samples entirely covered with a gold-plated coating are heated by placing them on a SiC sintered body sample stage (infrared absorber).
For powder samples with high infrared transmittance, heating is performed using a special carbon material with low outgassing.