What's the difference of Rubber co-extrusion and PVC co-extrusion?

Core difference: Rubber (EPDM/NBR etc.) is "thermoset", requiring vulcanization after extrusion. PVC is "thermoplastic", only melt + cool, no curing step. Both use multiple extruders feeding one shared die to make one integrated multi-hardness/multi-layer profile (like your pinch weld seals).

To eliminate initial production defects and stabilize the quality of rubber molded parts, our factory has officially set up dedicated first mold inspection boxes in the rubber molding and curing workshop. Specially configured for the first batch products of each shift, the inspection boxes support dual quality verification including worker self-inspection and professional quality inspection. This front-end quality control mechanism effectively detects mold deviation, vulcanization defects, dimensional errors and appearance abnormalities at the earliest stage, standardizes the curing production process, ensures consistent precision and performance of all finished rubber molded parts, and delivers high-quality and reliable industrial rubber products for global clients.

This news introduces our standardized quality management system for rubber parts. We implement strict incoming inspection of raw materials including name, grade, manufacturer and test reports, establish traceable inventory cards for each batch of materials, and strictly follow the FIFO principle for material picking. The whole-process source control effectively avoids raw material aging and performance degradation, ensures stable quality, high precision and consistent batch performance of finished rubber molded parts, and guarantees reliable customized rubber products for various industrial fields.

On July 27, 2026, Qingdao Todo Rubber’s senior technical team joined the 2026 National Advanced Training Class for Rubber Product Formulas, co-hosted by top research institutes including the Wuxi Research Institute of Tsinghua University. Focusing on advanced polymer filler modification, low-VOC eco-friendly formulations, and durability enhancement, our engineers are applying these cutting-edge techniques across our core EPDM, NBR, Silicone, and Viton product lines. Leveraging 20 years of manufacturing and global trade expertise, Qingdao Todo Rubber continues to elevate product quality to ensure full compliance with REACH and RoHS standards for international industrial clients.

How the worker trim for custom molded rubber products? After vulcanization, molded rubber products will develop excess flash at the parting line. For complex custom rubber products, our factory employs a professional manual flash removal process.

Large industrial seals are prone to deformation in daily handling and testing, leading to inaccurate inner and outer diameter measurement results with traditional caliper tools. To solve this common industry pain point, we have launched a professional accurate measurement solution for large industrial seals. Eliminating manual reshaping operations, the system effectively reduces human and tool errors, realizes repeatable and consistent diameter data, greatly improves inspection accuracy and efficiency, and standardizes batch quality control. We continue to upgrade production and testing processes to deliver high-reliability sealing products for global industrial manufacturers.

How to solve the problem of diverse and varied customer packaging needs

Our company's bus-specific interior materials have successfully passed the authoritative R118 test flame retardancy test and obtained the bus access flame retardancy level report.

To ensure the quality of rubber products, our QA specialist Dora Du explained the requirements for trimming flash and quality standards of rubber parts to workers on-site. She patiently answered questions repeatedly for workers who had doubts, ensuring all relevant workers clearly understood the standards. We are proud of the proactive and responsible attitude of our QA team, whose dedication provides a strong guarantee for the stability and reliability of our products.

Workshop for colorful rubber part put into production today.