General Purpose Starch-Filled PP/PE Foaming Resin

About This Product

The resin is a powder compound in which native starch, at 30 to 70 per cent of the total, is dispersed through a polypropylene and polyethylene matrix. It is the general-purpose base resin of the series, for converters running their own water-based foaming lines, and it keeps the mechanical behaviour and line settings a polyolefin foam process already expects. It is supplied as a powder rather than pellets because the foaming step is water-based and run in-house. Starch is a hydrophilic polysaccharide that carries water, and here that water is the blowing agent: held in the starch phase through the extruder under pressure, it flashes to steam at the die, while the polyolefin matrix supplies the melt strength that holds the cell walls until they set. The granules also act as nucleation sites, so loading governs cell count and cell size as well as composition. Every point of starch displaces virgin polypropylene or polyethylene and lowers the fossil-derived content of the sheet, but also raises moisture sensitivity, which is why starch loading, melt flow and foam density are set against the buyer's line and target sheet gauge. This grade is bio-based but NOT biodegradable or compostable. The starch content sits in a polypropylene/polyethylene matrix, so it does not meet EN 13432, ASTM D6400 or BPI. It must not be described, labelled or marketed as biodegradable or compostable. It is used in foamed sheet extrusion, protective packaging sheet, general-purpose foam converting and fossil polymer reduction. Bio Green Chem supplies the general purpose starch-filled foaming resin to specification on starch loading, melt flow, foam density and sheet gauge, as a raw material for processing on the buyer's own line; we do not produce finished articles.