Overview
Industrial dextrin is a starch-derived carbohydrate produced through partial hydrolysis or pyrolysis of starch. Unlike food-grade dextrin, industrial variants prioritize functional properties like adhesion and solubility over purity. It serves as a cost-effective binder and thickener in manufacturing processes. The material is classified by its Dextrose Equivalent (DE) value, which indicates the degree of starch conversion. Industrial dextrin typically has a DE between 2 and 20, making it less sweet but more viscous than higher-DE products like maltodextrin.
Physical and Chemical Properties
Industrial dextrin appears as a free-flowing powder ranging from white to light yellow, depending on processing methods. Its solubility increases with temperature - while cold water may only partially dissolve it, hot water yields complete dissolution. The substance exhibits excellent film-forming capabilities when dried. Chemically, dextrin is composed of D-glucose units linked by α-1,4 or α-1,6 glycosidic bonds. Unlike native starch, its shorter polymer chains provide lower viscosity at equivalent concentrations. The material chars rather than melts when heated, decomposing at temperatures above 200°C.
Main Applications
The adhesive industry accounts for approximately 60% of industrial dextrin consumption. It serves as the primary component in remoistenable gums for envelopes, labels, and stamps due to its excellent tack properties. In textile manufacturing, dextrin acts as a sizing agent to strengthen yarns during weaving. Paper producers utilize dextrin for surface sizing to improve printability and reduce ink absorption. Other notable applications include foundry core binders, abrasive wheel binders, and as a carrier for insecticides and fungicides in agricultural products.
Safety and Storage
Industrial dextrin presents minimal health risks, classified as non-toxic and non-irritating to skin. However, airborne powder may cause respiratory discomfort, necessitating proper ventilation in handling areas. The material is biodegradable and poses no significant environmental hazards. Proper storage requires moisture-proof packaging in a dry, cool environment below 25°C. Bulk storage silos should incorporate desiccants to prevent caking. Shelf life typically exceeds 12 months when stored correctly, though prolonged exposure to humidity may reduce solubility.
B2B Procurement Guide
When sourcing industrial dextrin, buyers should specify required parameters including DE value, solubility characteristics, and viscosity range. Bulk purchases (typically 25kg bags or tanker loads) offer significant cost advantages, with prices decreasing by 15-20% for orders exceeding 5 metric tons. Quality verification should include tests for moisture content (ideally <10%), ash content (<0.5%), and microbiological counts. Reputable suppliers provide Certificates of Analysis (CoA) with each batch. Asian manufacturers dominate global production, though regional distributors often maintain local stock for faster delivery.
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