Perlite www.perliteco.com MIHRAN CO. is a private industrial company established since over 50 years their activities excentreated in the industrial fields, supplied with wide experiences and customers service requirement. Perlite is not a trade name but a generic term for naturally occurring siliceous rock. The distinguishing feature which sets perlite apart from other volcanic glasses is that when heated to a suitable point in its softening range, it expands from four to twenty times its original volume.