Can in-house regrind count as recycled content?

Only count it if the customer, certification, or regulatory definition allows that source of reprocessed material.

Should degraded material be included?

No. Include only approved material that meets moisture, viscosity, color, contamination, and performance limits.

Can filler be included in the denominator?

Yes, if the target is based on total formulation mass. Use the same basis required by the claim or specification.

How can I use the result?

Use it to set blend feeder targets, manage regrind use, and confirm whether recycled-content goals are met.

Bioplastics & Biomaterials Processing calculator

Recycled Bio-Resin Content Calculator

Recycled bio-resin content helps teams manage approved regrind, post-industrial bio-based resin, recycled PLA, and reclaimed biomaterial streams without exceeding performance or certification limits. Processors use it to balance sustainability targets with melt flow, color, odor, mechanical properties, and degradation risk.

What this calculator does

Calculate recycled bio-resin or approved regrind content as a percentage of total biomaterial blend weight, with a target recycled-content requirement.
a compounder, film converter, or molder needs to verify recycled bio-resin or regrind percentage in a formulation
Returns recycled bio-resin or regrind share of the total biomaterial blend.

Formula used

Recycled bio-resin content = recycled bio-resin or regrind weight ÷ total biomaterial blend weight × 100
Recycled content gap to target = recycled bio-resin content - target recycled bio-resin content

Inputs explained

Recycled bio-resin or regrind weight: Use approved recycled PLA, post-industrial bio-resin, in-house regrind, or reclaimed biomaterial allowed in the blend.
Total biomaterial blend weight: Include virgin resin, recycled resin, filler, fiber, additive, color, and masterbatch weight in the same blend.
Target recycled bio-resin content: Use the formulation, customer, regulatory, or internal regrind limit for the product and material grade.

How to use the result

Use it for regrind control, recycled-content claims, blend approvals, material yield improvement, and purchasing plans.
It does not verify recycled-content certification, chain of custody, or property retention after multiple heat histories.

Common questions

Can in-house regrind count as recycled content? Only count it if the customer, certification, or regulatory definition allows that source of reprocessed material.
Should degraded material be included? No. Include only approved material that meets moisture, viscosity, color, contamination, and performance limits.
Can filler be included in the denominator? Yes, if the target is based on total formulation mass. Use the same basis required by the claim or specification.
How can I use the result? Use it to set blend feeder targets, manage regrind use, and confirm whether recycled-content goals are met.

Last reviewed 2026-05-12.