Xingtai Longcheng Sealing Co., Ltd., a custom rubber parts manufacturer in Hebei, China, delivered 1,350 new custom rubber parts in the past year — one of the strongest indicators of its design-to-production speed. Founded in 2009, the company has grown into a verified custom manufacturer with more than 8,000 mold sets, 40 production lines and a 5,000 m² facility employing over 100 people.
Design and Tooling: 8,000+ Mold Sets, 1,350 New Parts a Year
Custom parts start with tooling. Longcheng's in-house mold design team, combined with a library of more than 8,000 existing mold sets, means many parts can be tooled or adapted faster than the market average — often without the cost of a full new mold. In the last 12 months alone, the company developed, tooled and delivered 1,350 new custom rubber products.
In-House Compounding: Formulated, Not Just Molded
Unlike many molding shops that only buy ready-made compounds, Longcheng operates its own rubber mixing and compounding R&D team. This allows the factory to formulate materials to exact customer requirements across NBR, FKM, EPDM, Silicone, HNBR, FFKM, CR and PU, and to guarantee batch-to-batch consistency with full raw-material traceability.
Manufacturing Scale: 40 Lines, 400–1800 mm Vulcanization
The factory runs 40 production lines with 36 machines, including vulcanizing presses from 400 mm up to 1,800 mm — covering small precision O-rings through large custom-molded parts. Prototype runs and mass production share the same lines, so customers can validate a design and scale it without switching suppliers.
Quality Control: Certified, Audited, Traceable
- ISO 9001 certified quality management system
- RoHS and CE compliant products
- Intertek supplier assessment with on-site factory check
- Full-line QC with random sampling plus inspection to customer specification
- 89.3% on-time delivery, average response time under 4 hours
With exports to Southeast Asia, North America, South America and Europe, Longcheng now ranks among the most popular suppliers in the Seals category on Alibaba.com and serves OEMs, distributors and end users across 20+ markets.
What This Means for Buyers
For OEMs and distributors, the practical takeaway is short: faster tooling, real material flexibility, and a quality system that has been independently audited. Whether you need 100 prototype parts or 100,000 production parts, the same factory, the same compound and the same QC standards apply.
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