How do you calculate elastomer scrap cost?

Multiply scrap weight by loaded cost per kg by the non-recoverable share, then add disposal. For 120 kg at $5.20/kg, 80% non-recoverable plus $150 disposal, total is $649.20.

Why not count 100% of the material cost as scrap?

Uncured rubber and some purge can be reground and blended back in, recovering value. The non-recoverable share (80% in the default) is the portion that is truly lost, usually cured or contaminated material.

What is loaded compound cost?

It is the fully-costed price per kg of mixed compound, polymer, fillers, plasticizers, curatives and mixing conversion, not just raw polymer. Using raw polymer price alone understates scrap cost badly.

What does scrap cost per kg tell me?

It normalizes total cost by weight so you can compare presses or jobs. In the default case $649.20 over 120 kg is $5.41/kg, which is above the $5.20 material cost because disposal loads onto every kilogram.

How do I lower elastomer scrap cost?

Attack the biggest term: cut non-recoverable weight through better shrinkage control and shorter start-up purge, and increase the reground share by segregating uncured scrap so it doesn't hit landfill.

Is flash included in scrap weight?

Yes, flash, sprues, purge and rejected parts all count as scrap weight. Whether flash is recoverable depends on cure state and contamination, which you reflect in the non-recoverable share.

Rubber, Tires, Foam & Elastomer Manufacturing calculator

Elastomer Scrap Cost Calculator

Elastomer scrap cost turns rejected rubber, flash, and purge into a real dollar figure a cost engineer can act on. It matters because compounded rubber carries loaded material cost, polymer, carbon black, oils, curatives and mixing labor, and once a batch is cured, most of that scrap cannot be reground back into virgin-quality compound. Molding cost accountants and continuous-improvement teams use it to size the prize for a scrap-reduction project and to build accurate quotes that don't get eaten by hidden reject cost. The disposal-and-handling term captures the extra bite of hauling and treating uncurable elastomer waste.

What this calculator does

Estimate the cost of scrapped elastomer, accounting for invested material value, non-recoverable share and disposal of cured waste.
A process engineer uses it to quantify the dollar impact of flash, purge and reject rates on a rubber molding line.
It computes total scrap cost as non-recoverable material value plus a fixed disposal charge, and divides by weight for a cost-per-kg figure.

Formula used

Scrap cost = scrap kg x loaded cost/kg x non-recoverable% + disposal charge
Cost per scrap kg = total scrap cost / scrap kg

Inputs explained

Scrap elastomer weight:
Loaded compound cost:
Non-recoverable (non-regrind) share:
Disposal and handling charge:

How to use the result

Use it when building a quote's scrap allowance, justifying a yield-improvement project, or comparing scrap cost across compounds or presses.
It uses a single non-recoverable share; in practice regrind value varies by compound and whether the scrap is uncured, so blended waste streams need weighting.

Current U.S. benchmarks

The producer price index for plastic resins and materials stands at 280.569 (BLS, Aug 2026), up 6.6% from a year earlier. Quotes priced off last quarter's material cost miss this move.
U.S. light vehicles sell at a 16.0 million annual rate (BEA, Sep 2026), down 3.6% from a year earlier, the volume signal for automotive supply chains.
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 elastomer scrap cost? Multiply scrap weight by loaded cost per kg by the non-recoverable share, then add disposal. For 120 kg at $5.20/kg, 80% non-recoverable plus $150 disposal, total is $649.20.
Why not count 100% of the material cost as scrap? Uncured rubber and some purge can be reground and blended back in, recovering value. The non-recoverable share (80% in the default) is the portion that is truly lost, usually cured or contaminated material.
What is loaded compound cost? It is the fully-costed price per kg of mixed compound, polymer, fillers, plasticizers, curatives and mixing conversion, not just raw polymer. Using raw polymer price alone understates scrap cost badly.
What does scrap cost per kg tell me? It normalizes total cost by weight so you can compare presses or jobs. In the default case $649.20 over 120 kg is $5.41/kg, which is above the $5.20 material cost because disposal loads onto every kilogram.
How do I lower elastomer scrap cost? Attack the biggest term: cut non-recoverable weight through better shrinkage control and shorter start-up purge, and increase the reground share by segregating uncured scrap so it doesn't hit landfill.
Is flash included in scrap weight? Yes, flash, sprues, purge and rejected parts all count as scrap weight. Whether flash is recoverable depends on cure state and contamination, which you reflect in the non-recoverable share.

Last reviewed 2026-07-13.