Water-Soluble Loose Fill Peanut Compound (PBAT/Starch)

About This Product

The compound is a powder blend of polybutylene adipate terephthalate and starch, supplied for expansion on a loose-fill foaming line rather than as finished peanuts. PBAT is a biodegradable aliphatic-aromatic copolyester of butanediol with adipic and terephthalic acids; starch is a hydrophilic polysaccharide, and here it governs how the peanut behaves in water. Loose fill is bulky and expensive to ship as a finished product, since a lorry of peanuts is mostly air, so converters increasingly foam it at the point of use and a dense powder compound is what makes that economic. The formulation has to give a cell structure with enough compressive strength to hold a product off the wall of a carton at very low density, then give that structure up on demand. Starch does both: its hydroxyl-rich backbone builds rigid cell walls, and the same hydroxyl groups make those walls hydrate. Water penetrates the structure, the starch phase swells and loses cohesion, and the peanut dissolves, which is how the end user disposes of it and why no separate collection stream is needed. The property providing that route is the one that makes the fill vulnerable to humidity, so this is the grade to choose where the packaging will not encounter moisture in transit. Certified compostable options are available on request. It is used in e-commerce void fill, fragile item protection, in-house loose fill production and dry goods despatch. Bio Green Chem supplies the water-soluble loose fill compound to specification on PBAT and starch ratio, bulk density, dissolution behaviour and foaming line compatibility, as a raw material for processing on the buyer's own line; we do not produce finished articles.