What is the difference between polyurethane, urethane, and polyisocyanurate bunstock foam?
Originally the rigid bunstock industry produced polyurethane foam. Out of convenience, some shortened the name to “urethane” and used the terms interchangeably. Later using the same basic raw materials but in more optimized portions, polyisocyanurate (“polyiso” for short) foams were developed and continue to be produced today. Among the advantages polyiso foams have over their polyurethane predecessors are improved physical performance properties and greater dimensional stability over a wider temperature range.
