Glossary

PQRS
Polyurethane Foam
polyurethane foam

Also known as Poly or Polyfoam, is a polymeric substance containing many urethane linkages (-N-C-O-) processed into a foam. In the simplest version, it is a mixture of isocyanate, polyol, and water foamed and cured. It is the most common type of foam used in mattresses and in its medium or higher grades can be successfully used as a support layer. Unlike memory foam, it is made to compress under pressure rather than soften, giving it a higher resilience and progressive resistance than memory foam and allowing it to hold up the heavier parts of the body much more effectively. There are three polyfoam grades that are measured by the foam density and "support factor" or progressive and will break down quickly; this grade of polyfoam is not desirable for a support layer e resistance to compression.

  • Regular conventional polyfoam is the lowest grade polyfoam and weighs less than 1.5 lbs. per cubic feet and will break down quickly; this grade of polyfoam is not desirable for a support layer.
  • High Density (HD) has a density in the range of 1.5 to 2.4 lb./ft3. It is suitable for a support layer but overall has less resilience and progressive resistance than its latex or innerspring counterparts. It lasts longer than the lower density conventional polyfoam
  • High Resilience (HR) is the highest grade of polyfoam. To be considered HR must have both a higher than 2.5 lb./ft3 density and have a compression modulus of 2.4 or higher (which is an important factor why the HR has the qualities it has) It is more durable and has better resilience than the other polyfoam grades, making it a suitable support material.
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