Question 1

What does a polyol blend calculator do?

Accepted Answer

A polyol blend calculator combines multiple polyols into one effective formulation value. It calculates blended OH value, blend equivalent weight and total reactive equivalents for polyurethane foam formulation work.

Question 2

How is blended OH value calculated?

Accepted Answer

Blended OH value is calculated by multiplying each polyol part by its OH value, adding those values, and dividing by total polyol parts.

Question 3

How is blended equivalent weight calculated?

Accepted Answer

Blended equivalent weight is calculated from total parts divided by total reactive equivalents. Each polyol equivalent contribution is calculated as parts divided by equivalent weight.

Question 4

Can I enter equivalent weight instead of OH value?

Accepted Answer

Yes. Each polyol row allows either OH value or equivalent weight input. The calculator converts between OH value and equivalent weight using the standard 56100 relationship.

Question 5

Why does blend equivalent weight affect isocyanate calculation?

Accepted Answer

Blend equivalent weight determines the reactive hydrogen equivalents in the polyol side. Changing blend equivalent weight changes the isocyanate quantity required to reach a target NCO index.

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