Adhesives, Sealants & Industrial Bonding calculator

Two-Part Mass Mix Ratio Calculator

Check a weighed two-part adhesive batch against its specified mass ratio. Enter the net grams of both components and the supplier ratio by mass.

What this calculator does

  • Check the dispensed resin-to-hardener mass ratio against the supplier specification.

Formula used

  • Mass ratio = resin mass ÷ hardener mass
  • Signed deviation (%) = (mass ratio ÷ specified mass ratio − 1) × 100
  • Batch mass = resin mass + hardener mass
  • Required hardener mass = resin mass ÷ specified mass ratio

Inputs explained

  • Resin Mass: Net resin mass from a tared scale.
  • Hardener Mass: Net hardener mass from a tared scale.
  • Specified A:B Mass Ratio: Supplier parts of resin per one part hardener by mass.

How to use the result

  • Best suited to hand-mixed adhesive batch check, dispensing pump mass verification.
  • Volume ratios require supplier densities or a published mass ratio before use. No universal acceptable ratio error is assumed.

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

  • Can I enter a ratio specified by volume? No. Obtain the mass ratio from the supplier, or convert using both component densities before entering it.
  • What does a positive ratio deviation mean? It means the resin-to-hardener mass ratio exceeds the specified ratio. It does not directly measure excess resin as a percentage of total batch mass.
  • Is a small deviation acceptable? Only the supplier or qualified process specification can set that limit. This calculator reports deviation without declaring a batch acceptable.
  • Can extra hardener speed up the cure? Do not change the specified ratio to control cure time. Use the supplier-approved formulation and curing conditions.

Last reviewed 2026-10-01.