Question 1

What is a foam density calculator?

Accepted Answer

A foam density calculator estimates polyurethane foam density from formulation inputs such as water level, isocyanate parts, additives, blowing contribution and packing factor.

Question 2

What foam density formula does this calculator use?

Accepted Answer

The basic foam density formula is mass divided by volume. For this polyurethane foam calculator, the estimate combines formulation mass, CO₂ generation, physical blowing contribution and estimated foam volume. In practical terms, g/L is equivalent to kg/m³.

Question 3

What is free-rise foam density?

Accepted Answer

Free-rise foam density is the density of foam when it expands without mould restriction. It is commonly used as a baseline value during polyurethane foam formulation trials.

Question 4

Why does increasing water reduce foam density?

Accepted Answer

Water reacts with isocyanate and generates carbon dioxide gas. More gas usually expands the foam volume and lowers density, although processing stability, heat, cell opening and final foam quality must also be checked.

Question 5

Can this calculator estimate moulded or molded foam density?

Accepted Answer

Yes. The calculator can estimate moulded or molded foam density by applying a packing factor to the free-rise density result.

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