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Wärmeschutzfilter n
meas.inst.	heat filter
microsc.	heat-absorbing filter
opt.	heat-absorbing filter glass; heat absorber; heat filter (placed in front of a lamp to protect condenser systems, interference filters etc.); heat-absorbing filter (placed in front of a lamp to protect condenser systems, interference filters etc.); heat reflector (it is a multilayer coating with a high reflectance in the near infrared and a high transmittance in the visible)
phys.	heat-reflecting filter