How are white spots or gel particles on the tubing surface prevented?

White spots and gel particles are distinct defects with different root causes. White spots on transparent or light-colored tubing typically result from low-molecular-weight species — residual decomposition products from the vulcanizing agent or processing aids — migrating to the surface during storage or use. Optimizing the secondary vulcanization step (commonly 4–6 hours at 165°C) drives off these volatiles before they can accumulate at the surface, addressing the problem at the source. Gel particles are formed by premature local crosslinking during compounding or extrusion, producing hard specks dispersed through the tube wall; controlling mixing temperatures and extruder barrel temperature uniformity prevents the hotspots that trigger early gelation. A separate cause of surface white spotting is chemical reaction: contact with alcohol or certain cleaning agents can produce a surface reaction on some silicone formulations, which is avoided by controlling the storage and handling environment rather than by modifying the compound.

For product specifications, technical data sheets, or sample requests, contact the Ruixiang team: olivia@dgruixiang.com  |  www.medicalsiliconetube.com