A new door from Stertil Stokvis is
constructed from steel sandwich
panels with a polyisocyanurate (PIR)
core. The polymer structure of the
PIR foam from Kingspan is difficult
to ignite and self-extinguishing,
thereby providing enhanced fire
resistance. The PIR panels have low
heat conductivity, good mechanical
parameters and low water absorption.

Panels are HFC, CFC and HCFC
free and the insulation core has been
awarded a Low Global Warming
Potential classification. The thermal
properties of the door are said to
help keep down energy costs.