Your Professional Composite Materials Supplier
Zhejiang Heyi Chemical Co., Ltd. was established in March 2022, broke ground in June 2023, and is scheduled to begin production in June 2024. Located in the Modern Pharmaceutical and Chemical Park of the Xianju Economic Development Zone in Zhejiang Province, the approximately 64,000 square meter facility is a new materials company integrating R&D, production, and sales.
Types Of Composite Materials
Sales Markets:
Our business spans more than 40 countries worldwide, covering both developed and emerging markets, including the EU, North America, Asia Pacific (including Japan, South Korea, and ASEAN countries), South America, and key growth regions such as South Asia and the Middle East.
Certifications:
We are ISO9001, ISO14001, SGS, and UL certified, and our products comply with RoHS and REACH safety regulations.
Technical Support:
Zhejiang Heyi Chemical Co., Ltd. provides technical support to customers, offering expertise and guidance on the proper use, application, and handling of epoxy resin products.
Quality Control and Testing:
Zhejiang Heyi Chemical Co., Ltd. ensures the quality of its epoxy resin products through rigorous quality control measures and testing.
Composite Materials
The components work together to produce a material with superior strength, stiffness, durability, or lightweight performance compared to traditional single-material products.
Typical composite structures consist of a reinforcement (such as glass or carbon fiber) and a matrix (such as epoxy or polyester resin).
They are widely used in aerospace, wind energy, construction, automotive, and marine industries.
Advantages of Composite Materials
Composite materials offer outstanding performance advantages for industrial applications such as wind turbines, electronics, high-performance composites, and insulation components. They provide high strength-to-weight ratio, excellent thermal stability, and superior chemical resistance, ensuring reliable operation in demanding environments. With tailored mechanical and electrical properties, composite materials improve efficiency, reduce maintenance costs, and extend the service life of industrial products.
Exceptional Structural & Environmental Resistance: Delivers a superior strength-to-weight ratio alongside outstanding chemical resistance for reliable performance in demanding conditions.
High Thermal Stability & Long Service Life: Maintains integrity under extreme temperatures, offering extended durability with minimal maintenance.
Customizable comprehensive features: Mechanical and electrical properties can be precisely engineered to meet specific application requirements.
Versatile High-Performance Applications: Ideally suited for wind turbines, electronics, insulation systems, and advanced composite structures.
Reduced Total Cost of Ownership: Lightweight design and long-lasting performance contribute to significant lifecycle cost savings.
Applications of Vacuum Casting
Healthcare Tools:
Vacuum casting shapes custom surgical tools and prosthetics that fit patients like a glove, think lightweight inhaler housings, sterilizable and ready in days, not months.
Tech That Feels Right:
It transforms clunky 3D-printed electronics into sleek, market-ready gems, ergonomic toothbrush grips or smartwatch casings with textures and snap-fits that click just so.
Automotive Edge:
Under-the-hood prototypes like sensor housings or dashboard parts get built tough for testing, dodging the hefty price of metal molds.
Aerospace Precision:
Lightweight housings mimicking carbon fiber’s strength roll out for preflight checks, proving their worth without weighing down the budget.
Global Application Highlights
APG and Vacuum Casting techniques are trusted worldwide for producing high-performance composites with superior mechanical, thermal, and electrical properties. They are widely applied in wind energy components, electronic encapsulation, advanced composite structures, and insulation parts, providing reliable, efficient, and consistent manufacturing outcomes.
Key Benefits
●Complete resin impregnation and uniform curing
●High mechanical strength and structural integrity
●Reduced voids and defects for high-quality composites
●Suitable for large and complex industrial components
●Optimized for wind turbines, electronics, composites, and insulation applications globally
Materials Used in Vacuum Casting
Polyurethane Resins:
Polyurethane is the most commonly used material in vacuum casting. It can mimic various plastics, from flexible rubbers to rigid ABS.
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Silicone:
Used for mold-making, silicone offers durability and precise detail replication.
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Epoxy Resins:
Epoxies provide excellent strength and heat resistance, suitable for demanding applications.
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Elastomers:
Flexible and durable elastomers are ideal for soft-touch components and seals.
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Types of Automatic Pressure Gelating (APG) Technique & Vacuum Casting
Automatic Pressure Gelating (APG) and Vacuum Casting are advanced composite manufacturing techniques widely used in wind turbines, electronics, high-performance composites, and insulation components. Different types of these processes are designed to optimize material properties, improve structural integrity, and enhance production efficiency in demanding industrial applications.
Common Types / Techniques
Automatic Pressure Gelating (APG) Techniques
- Standard APG: Uses controlled pressure to inject resin into fiber reinforcements, ensuring complete impregnation and uniform curing.
- High-Pressure APG: Enhanced resin flow and reduced voids, suitable for large composite structures such as wind turbine blades.
- Low-Pressure APG: Optimized for thin-wall components, improving surface finish and reducing resin waste.
- Temperature-Controlled APG: Incorporates precise heating during gelation to improve mechanical strength and thermal stability.
Vacuum Casting Techniques
- Conventional Vacuum Casting: Uses vacuum to remove air bubbles during resin infusion, ensuring high-quality composite parts.
- Multi-Chamber Vacuum Casting: Allows simultaneous production of multiple small-to-medium parts with consistent quality.
- High-Temperature Vacuum Casting: Optimized for heat-resistant composites used in electronics and insulation applications.
- Low-Viscosity Resin Vacuum Casting: Ensures complete penetration in complex molds for high-performance composite parts.
Working Principle of Vacuum Casting
Crafting the Master Model
Every vacuum-cast part begins with a master, a flawless prototype of your design. This model is typically 3D-printed using high-resolution SLA technology or CNC-machined for precision. Surface imperfections matter here; any flaw on the master will replicate across all copies, so it’s polished to a near-mirror finish.
Silicone Mold Creation
The master is suspended in a steel frame, and liquid silicone rubber (LSR) is poured around it. Imagine embedding a delicate object in gelatin, except this silicone cures into a durable, flexible mold. After curing (usually 6-12 hours), the mold is carefully sliced open, the master is removed, and what remains is a cavity perfectly mirroring your design.
Resin Casting Under Vacuum
Liquid polyurethane resin, selected for rigidity, flexibility, or transparency, is poured into the silicone mold. The entire assembly is placed in a vacuum chamber, where suction evacuates trapped air. This step is critical: air bubbles can obscure fine details or weaken the part. The vacuum ensures that the resin flows into even micron-scale features, like micro-textures or hollow channels.
Curing and Demolding
The filled mold moves to an oven, where heat triggers the resin’s chemical hardening. Depending on the material, curing takes 1-4 hours. Once cooled, the mold is peeled open, revealing a finished part that’s functionally and visually identical to the master. A single silicone mold can produce 20-30 copies before losing fidelity.
Key Technical Specification For Vacuum Casting
Material Choice:
A wide range of material selections is available including rubber, resin, and plastic;
Maximum Part Dimension:
The dimensions of the vacuum chamber restrict the size of the mold;
Minimum Wall Thickness:
The wall of the mold must be at least 0.75 mm thick in order to guarantee correct filling. However, the recommended wall thickness of 1.5 mm yields the optimum performance;
Surface Texture:
Shiny, matte, textured, and polished finishes
Master Model Creation: A master model is first produced using 3D printing, CNC machining, or another suitable method. The master model represents the desired shape, form, and details of the final part or product.
Mold Preparation: A silicone mold is created from the master model. The master model is placed in a container, and liquid silicone is poured over it, covering the model completely. The silicone is then allowed to cure, forming a flexible and durable mold.
Mold Assembly: Once the silicone mold has cured, it is cut into halves, creating a mold cavity. The halves are then reassembled using alignment features to ensure proper alignment during casting.
Material Casting: The desired casting material, typically polyurethane resin, is prepared. The mold is preheated to a specific temperature and placed in a vacuum chamber. The vacuum chamber is sealed, and a vacuum is applied to remove any trapped air or gases from the mold.
Pouring and Curing: The prepared casting material is poured into the mold cavity through a small opening or sprue. The vacuum pressure helps to draw the material into the mold, ensuring proper filling and minimizing air bubbles. The mold is then left undisturbed for the material to cure and solidify.
Mold Removal and Finishing: After the casting material has fully cured, the mold is opened, and the replica part is removed. Any excess material or flashing is trimmed and removed. The part may undergo additional post-processing steps, such as sanding, painting, or surface finishing, to achieve the desired aesthetics and functionality.
Certificates
FAQ
We're well-known as one of the leading composite materials manufacturers and suppliers in China. If you're going to wholesale high quality composite materials, welcome to get more information from our factory. Also, custom service is available.
Automatic Pressure Gelating Technique, composite materials, Vacuum Casting