Is the default 2% limit a supplier recommendation?

No. It is an illustrative value. Replace it with the relative ratio tolerance in your supplier instructions or qualified process specification.

Does this percentage measure excess hardener mass?

No. It measures the relative error in the resin-to-hardener mass ratio. A negative signed value identifies a hardener-rich proportion, not hardener mass as a percentage of the batch.

Can a ratio-compliant batch still cure poorly?

Yes. Incomplete mixing, unsuitable temperature, contamination or an incorrect cure schedule can still prevent the required properties.

What if positive and negative ratio limits differ?

This calculator uses a symmetric allowance. For asymmetric limits, compare the signed deviation with the applicable upper or lower limit in your specification.

Adhesives, Sealants & Industrial Bonding calculator

Mix Ratio Deviation Calculator

Check a dispensed adhesive mix against your qualified ratio tolerance. Enter the resin and hardener masses, supplier mass ratio and allowed relative deviation.

What this calculator does

Measure adhesive mass-ratio deviation and check it against your qualified process tolerance.

Formula used

Specified resin mass = hardener mass × specified mass ratio
Actual mass ratio = resin mass ÷ hardener mass
Signed deviation (%) = (resin mass − specified resin mass) ÷ specified resin mass × 100
Absolute deviation (%) = abs(signed deviation)
Tolerance headroom = allowed relative deviation − absolute deviation

Inputs explained

Resin Mass: Net resin mass recorded by the tared dispensing scale.
Hardener Mass: Net hardener mass recorded on the same basis.
Specified A:B Mass Ratio: Supplier grams of resin per gram of hardener.
Allowed Relative Deviation: Symmetric relative ratio tolerance from your qualified mixing specification.

How to use the result

Best suited to metered dispenser ratio release check, hand-mixed batch tolerance review.
Scale resolution, calibration and measurement uncertainty are not included. A ratio check cannot predict bond strength or failure probability.

Current U.S. benchmarks

The producer price index for industrial chemicals stands at 336.006 (BLS, Aug 2026), up 13.3% from a year earlier. Quotes priced off last quarter's material cost miss this move.
The U.S. has 11,391 plastics and rubber products establishments employing about 815,988 workers (Census County Business Patterns, 2023).

Common questions

Is the default 2% limit a supplier recommendation? No. It is an illustrative value. Replace it with the relative ratio tolerance in your supplier instructions or qualified process specification.
Does this percentage measure excess hardener mass? No. It measures the relative error in the resin-to-hardener mass ratio. A negative signed value identifies a hardener-rich proportion, not hardener mass as a percentage of the batch.
Can a ratio-compliant batch still cure poorly? Yes. Incomplete mixing, unsuitable temperature, contamination or an incorrect cure schedule can still prevent the required properties.
What if positive and negative ratio limits differ? This calculator uses a symmetric allowance. For asymmetric limits, compare the signed deviation with the applicable upper or lower limit in your specification.

Last reviewed 2026-10-01.