Central China faces a capacity gap in precision liquid silicone rubber (LSR) overmolding. Xiangchu (Hubei) Rubber Co., Ltd., located at No. 54, Neihe Lane, Fankou Street, Echeng District, Ezhou, Hubei, launched its new official website to upgrade services and expand LSR product capacity. With ISO 9001 certification, we can stably supply high-quality custom LSR products to meet market demand.
Liquid Silicone Rubber (LSR) overmolding, also called precision LSR insert molding, is a high-skill manufacturing process that bonds biocompatible, elastic liquid silicone rubber to rigid substrates including engineering plastics, stainless steel, aluminum, and glass. This process enables manufacturers to create multi-material components that combine the structural rigidity of hard substrates with the sealing, insulation, and soft-touch properties of LSR. In recent years, growing global demand for precision LSR overmolded components — driven by the expansion of medical devices, consumer electronics, automotive electronics, and smart home appliances — has exposed significant regional capacity gaps in Central China (Huazhong region).
Huazhong, encompassing Hubei, Hunan, Henan, and Jiangxi provinces, is a rapidly emerging industrial hub for automotive and electronics manufacturing in China. However, for years, the region lacked dedicated large-scale capacity for precision LSR overmolding, forcing local brand manufacturers to outsource projects to LSR producers in the Pearl River Delta or Yangtze River Delta, resulting in longer lead times, higher logistics costs, and greater supply chain volatility. Against this backdrop, 橡楚（湖北）橡胶有限公司 (Xiangchu (Hubei) Rubber Co., Ltd.), a specialized LSR product manufacturer based in Ezhou, Hubei, has completed capacity expansion for precision LSR overmolding and officially launched its new export-focused website, filling the long-standing regional capacity gap for this high-value process. This article explores the technical requirements of precision LSR overmolding, the current market gap in Central China, and how Xiangchu’s expanded capacity addresses industry demand.
Central China’s industrial landscape has transformed dramatically over the past decade, with major automotive OEMs, electronics contract manufacturers, and medical device producers establishing production bases across Hubei and surrounding provinces. This growth has created a sustained, unmet demand for local precision LSR overmolding services.
The following table outlines the major end-use industries driving LSR overmolding demand in Central China and their annual growth rates, based on 2021-2024 regional industry data:
Unlike basic LSR molding, precision overmolding requires strict control over dimensional tolerance (typically ±0.01mm to ±0.05mm, depending on component size), consistent adhesion between LSR and substrate, and compliance with industry-specific material regulations such as USP Class VI for medical applications or FDA 21 CFR for food contact components. Prior to Xiangchu’s capacity expansion, most local manufacturers in Central China could only process low-precision, large-tolerance LSR components, while high-precision overmolding projects had to be shipped 800-1500km to southeastern coastal facilities.
The lack of local precision LSR overmolding capacity created three core pain points for Central China-based brands:
As a specialized LSR product manufacturer located in 湖北省鄂州市鄂城区经济开发区凡口街道内河巷54号, Xiangchu is strategically positioned within 100km of Wuhan, the core industrial city of Central China, making it ideal for serving regional OEMs and addressing this gap. With the launch of its new export website, Xiangchu is now positioned to serve both regional domestic clients and global brand buyers seeking reliable LSR overmolding capacity.
Precision LSR overmolding is a complex process that differs significantly from conventional solid silicone molding or basic LSR injection molding. Success depends on strict control across material preparation, substrate pre-treatment, injection molding process parameters, and post-processing. Below we break down the core technical requirements for high-quality precision overmolding.
The first critical step in any precision overmolding project is matching LSR material grades to the substrate and end-use application. Unlike general-purpose LSR, overmolding-grade LSR must be formulated to form a permanent chemical bond with the substrate, rather than relying solely on mechanical interlocking. The table below summarizes common substrate-LSR compatibility and required material modifications:
At Xiangchu, we conduct mandatory compatibility testing for all new overmolding projects prior to full production. Testing includes peel adhesion strength testing, thermal cycling testing (from -40°C to 125°C for 100 cycles), and water immersion testing to verify bond stability under end-use conditions. We also maintain a full range of LSR material grades in stock, including food-contact compliant, medical-grade, high-temperature resistant, and low-hardness (10 Shore A) grades for soft-touch applications.
Precision LSR overmolding requires tight control of all key injection molding parameters to avoid common defects such as incomplete filling, substrate shifting, bond delamination, and dimensional deviation. The core process parameters and their acceptable tolerance ranges for precision components are outlined below:
Dimensional tolerance is the most critical performance metric for precision overmolding. For small components (less than 50mm in overall dimension), most applications require a tolerance of ±0.01mm to ±0.02mm, which demands high-precision mold tooling and closed-loop process control. At Xiangchu, all of our overmolding presses are equipped with real-time parameter monitoring systems that log every process variable for each production run, enabling full traceability for quality control. We operate only Class 100,000 clean molding workshops for medical and food-contact components, to eliminate contamination risks that can compromise bond strength and component performance.
To address the unmet demand for precision LSR overmolding in Central China, Xiangchu has invested over RMB 20 million in capacity expansion over the past 18 months, adding 8 new high-precision LSR injection molding presses and supporting processing equipment. We hold ISO 9001 quality management system certification, and all operations follow standardized quality control protocols to meet global customer requirements.
Xiangchu’s manufacturing facility is located at 湖北省鄂州市鄂城区经济开发区凡口街道内河巷54号, covering a total production area of 12,000 square meters. Our precision LSR overmolding production line includes the following key equipment:
Our current annual production capacity for precision LSR overmolding components is 120 million pieces, which can accommodate both small-batch custom prototype runs (as low as 100 pieces) and large-volume mass production orders up to 10 million pieces per project. This flexible capacity model addresses the needs of both early-stage product development and full-scale OEM production, a gap that was largely unfilled by existing coastal producers.
As an ISO 9001 certified manufacturer, Xiangchu has implemented a full quality management system covering every stage of production from incoming material inspection to final product shipping. Our quality control process includes:
For export customers, we can provide full material test reports, process documentation, and compliance certificates to meet import requirements for medical, automotive, and consumer goods. The launch of our new export website streamlines inquiry, quotation, and order tracking for international customers, making it easier for global brands to access Xiangchu’s capacity in Central China.
Xiangchu’s new capacity for precision LSR overmolding brings tangible benefits to both regional domestic manufacturers and global export-focused brands. For Central China-based OEMs, local sourcing of precision overmolded components reduces lead times from an average of 21 days to 7-10 days for prototype runs, and from 35 days to 18-22 days for mass production, while cutting total logistics and quality management costs by an average of 15%. On-site technical support and faster issue resolution also reduce supply chain risk, which is particularly valuable for JIT automotive and electronics production.
For global brands looking to diversify their supply chain and reduce manufacturing costs, Xiangchu’s location in Central China offers competitive operating costs compared to coastal LSR producers, with lower labor and facility costs while maintaining the same quality standards. Our strategic location also provides convenient access to major domestic and international shipping routes: Wuhan Tianhe International Airport is just 80km from our facility, and the Port of Shanghai is 800km away, enabling efficient shipping for export-bound components.
The scarcity of precision LSR overmolding capacity in Central China has been a long-standing barrier to growth for regional industrial manufacturers, and an overlooked opportunity for global brands seeking cost-competitive, high-quality LSR components. With its strategic location in Ezhou, Hubei, ISO 9001 certification, and newly expanded precision overmolding capacity, 橡楚（湖北）橡胶有限公司 is well positioned to fill this gap, serving both local and international customers with reliable, high-precision LSR products.
The launch of Xiangchu’s new export website marks a key milestone in our commitment to serving global customers, providing a transparent platform for inquiry, technical consultation, and order management. Whether you are a regional Central China manufacturer looking for a local overmolding partner, or a global brand seeking a reliable LSR supply source, we welcome you to contact our team for more information. You can reach us at phone: +86 18071171144, email: churubber@163.com, or visit our new website to explore our production capabilities and product range.
