Hello .

I held PU foam sheet ( 2lb / cubic foot ) and i noticed that it has better mechanical properties that the PU foam that i pour in mold ( 2lb too )

Mine lacked rigidity and weighed twice !!! And has bigger cell size ( this incrise surface resin absorption and the weight ... )


So i did my little investigation ... What i learned is that PU foam available in sheet has much better characteristics compared to the PU foam that was carried out in our workshop.
I did my experiment with 2lb , but even with other density , there will always have big difference between the two .

I wonder if this would relate to the recent questions about the weight (too high) of carbon foam handle ?
And if machined PU foam ( from industrial sheet ) would give a better foam handle ( because with better mechanical properties ) .


Could someone give me some mechanical properties for the polyurethane foam ?
( compressive strength for PU foam , density : 6 and 8 lb / cubic foot )

If we could use a foam with better mechanical properties (compressive strength), then we could use foam with lower density and therefore lighter.
I'm thinking about foam as divinicell and roacell, wich are considered to have the best mechanical properties.

Any engineer here ?

What you buy in sheets starts out the same way as what you pour in your shop. But there is a difference in environmental control. The cores you pour in the summer and the ones you pour in the winter may exhibit considerable differences in density. As you know, temperature plays a major role in the foam's expansion. What you buy in sheets, commercially made, is generally done under controlled temperature which results in greater consistency.

You're right - the differences that folks experience in weight can have a lot to do with where and when they are pouring their foam.

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