The Core Manufacturing Force for Soft-Hard Material Combination

2025-12-19

Bost is a leading overmolding company specializing in innovative overmolding technology. Our core capabilities combine soft and hard materials seamlessly, delivering durable, high-quality solutions. Trust Bost as your expert partner in advanced overmolding for superior product performance.

From the comfortable grip of toothbrush soft rubber handles, the soft edge protection of phone cases, to the delicate touch of car buttons, these products that combine rigidity and flexibility all rely on the technical support of overmolding companies. Overmolding technology accurately combines soft materials (such as TPE, silicone) with rigid materials (such as ABS, PP) to achieve "1+1>2" product performance, and overmolding companies are the core carriers for the implementation of this technology. They need to have full-chain capabilities of material compatibility, mold design, and process optimization. BOST is a professional injection mold company, and as a long-term cooperative partner of senior overmolding companies, it has provided mature overmolding solutions for multiple industries.\

The clear screen made of high polished polycarbonate 5

Material compatibility judgment is the basic core capability of overmolding companies. The compatibility between soft and rigid materials directly determines product lifespan, and different industries have great differences in material requirements: the home appliance industry needs to balance touch and temperature resistance, often using TPE and ABS combinations; the medical industry prioritizes biocompatibility, mostly choosing medical-grade silicone and PC matching; the automotive industry values impact resistance and extreme temperature resistance, preferring TPE and PA66 combinations. Improper material matching is likely to cause problems such as soft rubber peeling and delamination. BOST is a professional injection mold company, and its technical team conducts special material tests for different industry needs: for example, when customizing overmolded baby food spoons for a maternal and child brand, BOST selected FDA-certified food-grade TPE and PP materials, ensuring firm combination through compatibility tests and no harmful substance precipitation, perfectly meeting the safety requirements of maternal and child products.

The rubber gasket made by over mold 4

Customized mold design is the core competitiveness of overmolding companies and also the professional advantage of BOST. The core difference between overmolding molds and ordinary injection molds lies in the need to achieve precise positioning and seamless bonding of rigid substrates and soft materials. Unreasonable mold positioning structure will lead to uneven soft rubber thickness and flash; improper layout of vent grooves will generate bubbles at the joint, affecting product strength and appearance. BOST is a professional injection mold company that customizes exclusive molds for overmolding characteristics: adopting a "double positioning pin + annular vent groove" structure to ensure that the rigid substrate is fixed without displacement; optimizing the flow path trajectory of soft materials through simulation software to ensure uniform filling. For example, when designing an overmolded button mold for a blender of a home appliance enterprise, BOST ensured that the joint between TPE soft rubber and ABS hard shell was smooth and flawless through this mold design, and the button pressing life was increased to more than 100,000 times, far exceeding the industry average.

Process parameter optimization is a key link for overmolding companies to ensure product quality. Overmolding requires strict control of temperature, pressure and injection speed: soft materials have low melting points, and excessive mold temperature is easy to deform and stick to the mold; excessive pressure may cause cracking of the rigid substrate. BOST is a professional injection mold company with a complete database of overmolding process parameters, which can accurately match schemes according to different material combinations: when producing overmolded buttons for automotive interiors, the mold temperature is controlled at 60-70℃, and the "low-speed soft rubber filling + high-speed pressure holding" mode is adopted to ensure uniform touch; when processing thin-walled electronic accessory overmolded parts, the injection speed is reduced to avoid bubble generation. An electronic enterprise was once troubled by the low qualification rate of overmolded parts. After BOST's intervention, by adjusting the barrel temperature and optimizing the pressure holding time, the product qualification rate was increased from 75% to 99.2%, efficiently solving the production problem.

For overmolding companies, full-process service capability is the core support to adapt to the needs of multiple industries. From early material selection and mold design, to mid-term mold testing and commissioning, mass production, and later quality inspection, each link needs precise control. As a professional injection mold company, BOST, with years of experience in the overmolding field, can provide customers with one-stop solutions. Whether it is mass production of daily consumer goods or customized needs of high-end industrial accessories, it can achieve efficient implementation with technical strength, and become a reliable partner in the overmolding field.

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FAQ

FAQs

What is the delivery lead time? Do you offer global logistics?

Standard products: 5–15 working days; custom modifications: 2–4 weeks. We support global air/sea freight and provide export customs clearance documents (including REACH/UL certifications).

What is the minimum order quantity (MOQ)? Do you support small-batch trial production?

The MOQ for standard products is ≥100kg. We support small-batch trial production (as low as 20kg) and provide mold testing reports and performance data feedback.

Can Bost customize modified plastics with special properties?

Yes! We offer modification services such as reinforcement, flame retardancy, conductivity, wear resistance, and UV resistance, for example:
• Adding carbon fiber to enhance stiffness
• Reducing the coefficient of friction through PTFE modification
• Customizing food-grade or medical-grade certified materials

How do I select the appropriate engineering plastic grade for my product?

Selection should be based on parameters such as load conditions (e.g., pressure/friction), temperature range, medium contact (e.g., oil/acid), and regulatory requirements (e.g., FDA/RoHS). Our engineers can provide free material selection consulting and sample testing.

What are the core advantages of Bost engineering plastics compared to ordinary plastics?

Bost engineering plastics feature ultra-high mechanical strength, high-temperature resistance (-50°C to 300°C), chemical corrosion resistance, and wear resistance. Compared to ordinary plastics, their service life is extended by 3 to 8 times, making them suitable for replacing metals in harsh environments.