It is found most frequently as a fire retardant in thermal insulation products , asbestos insulating board and ceiling tiles .
Amosite is seen under a microscope as a grey - white vitreous fiber .
Amosite is found most frequently as a fire retardant in thermal insulation products , asbestos insulating board and ceiling tiles .
Amosite is seen under a microscope as a grey - white vitreous fiber .