Viscoelastic foams are important components of many mattresses.They conform well to the body,and disperse the downward pressure a sleeping person exerts over the whole of the contact area.But low-resilience mattresses made with viscoelastic foam achieve their combination of properties because they have a high proportion of closed cells that slow the passage of air through the foam.This means foams can have poor breathability,and this is exacerbated by the heat and humidity caused by perspiration.In response to market demands for viscoelastic foams with greater air permeability,Sanyo has developed a new range of polyester and polyether polyols.These can be used together to make viscoelastic foams with better breathability and low temperature performance than other polyol combinations.
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