Overview
Caster rubber granules are engineered polymer particles designed for bonding to metal or plastic caster wheels through vulcanization or adhesive processes. They serve as a cost-effective alternative to solid rubber wheels, allowing manufacturers to customize performance characteristics like hardness and elasticity. These granules are typically made from recycled or virgin rubber compounds (e.g., SBR, NBR, or polyurethane) formulated for specific load capacities and environmental conditions. The market offers various grades tailored for different floor types, from epoxy-coated surfaces to delicate hardwood.
Physical and Chemical Properties
The granules exhibit Shore A hardness ratings between 60–90, with higher values indicating greater load-bearing capacity but reduced vibration absorption. Their compression set resistance ensures long-term shape retention under heavy loads. Chemically, most formulations resist degradation from water, oils, and mild detergents. Premium grades may include additives for UV stability (for outdoor use) or electrostatic dissipation (for cleanroom applications). Thermal stability typically ranges from -30°C to +80°C for standard products.
Main Applications
Industrial settings constitute the primary market, where granules coat heavy-duty casters for machinery, carts, and material handling equipment. The healthcare sector utilizes antimicrobial formulations for medical bed and IV stand wheels. In commercial environments, these particles create quiet, non-marking casters for office furniture and hotel luggage carts. Specialty applications include food-grade granules for kitchen equipment and ESD-safe versions for electronics manufacturing facilities.
Safety and Storage
While the granules pose minimal risk at room temperature, processing requires ventilation due to potential fume release during heating. Suppliers typically package the material in moisture-resistant bags with desiccants. Long-term storage exceeding 12 months may lead to slight hardening. Rotate stock using FIFO (first-in-first-out) methods. Compatibility testing is advised when switching between different rubber compound suppliers to prevent adhesion issues during production.
B2B Procurement Guide
Bulk buyers should evaluate suppliers based on: 1) Consistency in granule size distribution (affects coating uniformity), 2) Certifications like FDA or ROHS for regulated industries, and 3) Technical support for process optimization. Consider ordering pre-compounded colors to avoid secondary painting. For high-volume users, some manufacturers offer toll compounding services using the buyer's preferred rubber formula. MOQs typically start at 500kg, with discounts available for container-load quantities.
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