Melt Flow Index and Density Correlations in Polyolefin Quality Control
Melt flow index and density metrics must be verified together under exact standard loads to control polyolefin processability and field crack resistance.
Off-Spec Resin Claims
Meaning
Commercial disputes arise when a batch of plastic raw material fails to meet the agreed-upon technical specifications documented in the purchase contract. Off-spec resin claims typically involve deviations in melt flow index, moisture content, color or contamination levels that render the material unsuitable for the intended process.
Financial Impact
Processing substandard material leads to increased scrap rates and potential damage to injection molding equipment. When filing off-spec resin claims, buyers must provide laboratory data showing that the resin properties differ significantly from the manufacturer’s datasheet.
Dispute Resolution
Comparison of retain samples from the supplier and the buyer confirms the nature of the defect. Most off-spec resin claims result in a price reduction, a return of the material, a full refund or a credit toward future purchases of virgin resin.
Production Risk
Using material that is outside of specification can cause inconsistent part dimensions or mechanical failure in the field. Careful documentation of incoming material quality is the primary defense for a molder against the losses associated with off-spec resin claims. This evidence ensures that the cost of failure is borne by the party responsible for the material quality.
Such a system maintains the integrity of the polymer supply chain.