How do you calculate total rework cost?

Multiply affected parts by the per-part rework cost and the allocation share to get variable cost, then add fixed containment. For 420 parts at $1.65 each, 100% allocation, plus $600 containment: (420 x 1.65 x 1.00) + 600 = $693 + $600 = $1,293.

What is the rework cost per affected part?

It is the total rework cost divided by the parts reworked. In our example, $1,293 across 420 parts is $3.08 per affected part — nearly double the $1.65 hands-on rate once the fixed $600 containment is spread across the lot.

When is it cheaper to scrap than rework O-rings?

When the per-affected-part rework cost approaches or exceeds the replacement cost of a new part. At $3.08 per part in our example, if a fresh O-ring costs less than that to mold, scrap and remake instead.

What does the rework allocation share represent?

It is the fraction of the rework effort charged to this job or cost center. At 100% the full variable cost lands here; if quality and the supplier split the cost 50/50, you'd enter 50% to allocate only your share.

Why include a fixed containment cost?

Containment has costs that don't scale with part count: sorting the lot, writing the NCR, 100% inspection setup, and quarantine handling. The $600 fixed cost captures that overhead, which is why per-part cost rises sharply on small lots.

How can I reduce elastomer rework cost?

Attack the root cause — mold flash from worn tooling, undercure, or contamination. Lowering the parts needing rework drives the variable cost down directly, while the fixed containment cost only disappears when you eliminate the containment event itself.

Gaskets, Seals, O-Rings & Elastomer Components calculator

Rework Cost Calculator

Rework cost captures what it really costs to salvage a batch of out-of-spec elastomer parts: deflashing, re-trimming, re-inspecting, or re-curing seals and O-rings that failed first-pass quality. Quality engineers and cost accountants in gasket manufacturing use it to quantify the financial drag of a containment event and to justify process fixes. Because rework on cured rubber is labor-heavy and often can't fully restore properties, knowing the true cost — variable plus fixed containment — tells you when scrapping is cheaper than saving.

What this calculator does

Estimate rework cost for gaskets, seals, O-rings, and elastomer components requiring trim, sorting, cleaning, dimensional recovery, relabeling, or retest.
Use it when quality or operations needs to quantify the cost of reworking flash, minor dimensional defects, adhesive liner issues, surface contamination, packaging errors, or inspection escapes.
It sums the variable cost of reworking each affected part with a fixed containment cost to give the total dollars spent salvaging a nonconforming elastomer batch.

Formula used

Variable rework cost = elastomer parts needing rework × rework cost per part × rework allocation share
Total rework cost = variable rework cost + fixed containment cost

Inputs explained

Elastomer parts needing rework:
Rework cost per part:
Rework allocation share:
Fixed containment cost:

How to use the result

Use it during a quality containment or NCR to total the financial impact of reworking parts before deciding whether to rework, scrap, or deviate.
It assumes rework actually restores parts to spec; for many cured elastomers, re-trimming can't fix dimensional or compression-set failures, so a reworked part may still be scrap.

Current U.S. benchmarks

The U.S. has 11,391 plastics and rubber products establishments employing about 815,988 workers (Census County Business Patterns, 2023).

Common questions

How do you calculate total rework cost? Multiply affected parts by the per-part rework cost and the allocation share to get variable cost, then add fixed containment. For 420 parts at $1.65 each, 100% allocation, plus $600 containment: (420 x 1.65 x 1.00) + 600 = $693 + $600 = $1,293.
What is the rework cost per affected part? It is the total rework cost divided by the parts reworked. In our example, $1,293 across 420 parts is $3.08 per affected part — nearly double the $1.65 hands-on rate once the fixed $600 containment is spread across the lot.
When is it cheaper to scrap than rework O-rings? When the per-affected-part rework cost approaches or exceeds the replacement cost of a new part. At $3.08 per part in our example, if a fresh O-ring costs less than that to mold, scrap and remake instead.
What does the rework allocation share represent? It is the fraction of the rework effort charged to this job or cost center. At 100% the full variable cost lands here; if quality and the supplier split the cost 50/50, you'd enter 50% to allocate only your share.
Why include a fixed containment cost? Containment has costs that don't scale with part count: sorting the lot, writing the NCR, 100% inspection setup, and quarantine handling. The $600 fixed cost captures that overhead, which is why per-part cost rises sharply on small lots.

Last reviewed 2026-05-12.