Abstract

Quality grading systems for recycled thermoplastic resins are a foundational requirement for the reliable integration of secondary raw materials into industrial manufacturing supply chains. Despite this need, no standardized grading scale has been established for post-industrial and post-consumer polypropylene (PP), high-density polyethylene (HDPE), and low-density polyethylene (LDPE) resins in industrial supply chain contexts. This paper presents the design, operational implementation, and commercial validation of a hierarchical three-tier quality grading system comprising Grade A (Near Prime), Grade B (Commercial Grade), and Grade C (Low Grade), developed through more than twenty years of secondary polymer distribution practice at Maja World Wide LLC and formalized in USPTO Provisional Patent Application No. 64/043,650, filed April 19, 2026. The grading system assigns each incoming recycled resin batch to a quality tier based on six evaluation dimensions: visual inspection, polymer type verification, physical form classification, Melt Flow Index (MFI) testing, processing behavior assessment, and supplier reliability scoring. Commercial deployment data demonstrate a stable grade distribution of 35% Grade A, 45% Grade B, and 20% Grade C across PP, HDPE, and LDPE streams. Grade A material achieves first-pass specification compliance rates of 96.8–98.1%, Grade B achieves 90.8–93.1%, and Grade C processed through proportional blending achieves 86.4–89.1% across packaging, construction, automotive, and consumer goods applications (Table 1). The grading system provides the standardized quality language required for contractual specification guarantees in recycled resin supply agreements, directly enabling the industrial buyer confidence necessary for sustained circular economy procurement commitments.

Keyword: Recycled resin grading, quality classification, thermoplastic resin, post-consumer resin, secondary raw materials, circular economy, industrial supply chain, grade specification, polymer quality, buyer confidence

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Refrences:

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