HiTHERM® is an industry leader and has been maintaining and setting the standards for polyiso insulation performance since it’s opening in 2000. HiTHERM is a California based company dedicated to the manufacturing of polyurethane (PUR), polyisocyanurate (PIR) and polyurea products, the two primary products being HT-300® brand polyisocyanurate, a 25/50 product (ASTM E84), and the HT-450® high temperature polyisocyanurate. HiTHERM’s principles have been in the industry for over thirty years and have the knowledge and experience to keep HiTHERM on the leading edge of polyiso insulation manufacturing. HiTHERM has realized performance ratings and levels that the leading iso manufacturers have only dreamed to achieve. For more information, please refer to the HT-300 and HT-450 series information.