Producing Vacuum Cast Plastic Parts Pump Housings and Valves Using PVC and Nylon

Product Description:

In industrial applications, plastic components are often used to manufacture parts for equipment such as pumps, valves, and other mechanical systems. Vacuum casting offers a cost-effective and efficient way to produce these parts with high precision, durability, and performance. PVC (Polyvinyl Chloride) and Nylon are two materials commonly used in vacuum casting for industrial applications due to their excellent mechanical properties and resistance to wear and tear.

PVC is highly resistant to chemicals, which makes it ideal for components exposed to corrosive environments, such as pump housings and valve bodies in industries like water treatment, chemicals, and petrochemicals. It also has good impact resistance, making it suitable for parts that need to withstand rough handling or pressure. Nylon, particularly PA6 and PA66, is chosen for its strength, abrasion resistance, and ability to perform in high-stress environments, making it ideal for components like gears, valve seats, and pump impellers that need to endure frequent movement and contact.

The vacuum casting process for industrial parts begins with the creation of a detailed master model, which is then used to create a silicone mold. Liquid resin is poured into the mold, and a vacuum is applied to ensure that the resin fills every cavity without air bubbles or defects. This results in parts with excellent dimensional accuracy and smooth surfaces, which are critical in industrial applications where precision is required for proper function.

For manufacturers in the industrial sector, vacuum casting offers a cost-effective way to produce high-quality prototypes and small-to-medium production runs of plastic parts. Whether for testing new designs, producing custom parts, or creating replacement components, vacuum casting provides a reliable and efficient solution for the production of industrial plastic components.

Applications of vacuum casting
Vacuum casting is one of the most cost-effective ways to produce high quality, low volume plastic parts which can be similar to injection moulding parts

The parts are especially suitable for form, fit and function tests during the embodiment design stages, where they can be used for marketing, field user testing and product design verification purposes

There are many Urethane casting resins commercially available that can be used to create parts to satisfy a wide range of design requirements such as temperature requirements, different surface textures, hardness, etc.

Materials are also available to create parts that are fully opaque, translucent or completely transparent

Sometimes high-quality wax masters can be made using vacuum casting for investment casting to increase the finer details of intricate features

Typical technical specification

Polyurethane (PU), the full name of polyurethane, is a polymer material formed by polyol and polyisocyanate through polycondensation reaction with excellent mechanical properties

[1], which is extremely plastic. Its synthesis can be traced back to 1937, when Professor Byaer first synthesised straight-chain linear polyurethane resins using 1,6-hexanediisocyanate and 1,4-butanediol as raw materials

[2]. Several major classifications of polyurethanes include polyether-type, polyester-type, polyimide-type, and polyurea-type, etc. They can be made into materials such as polyurethane plastics (mainly foams), polyurethane fibres (known as spandex in China), polyurethane rubbers and elastomers

[3].After nearly eighty years of technological development, this material has a wide range of applications involving products such as coatings, adhesives, fabric finishes, leather modifiers, polyurethane soft/rigid foam, elastomers, etc., which are used in the fields of textiles, construction, aviation, shipping, transportation, medicine, electronics, and so on.

Flexible polyurethane mainly has a linear structure with thermoplasticity, which has better stability, chemical resistance, resilience and mechanical properties than PVC foams, with less compression variability. Heat insulation, sound insulation, shock resistance, anti-virus performance is good. Therefore, it is used as packaging, sound insulation and filtration materials. Rigid polyurethane plastic is lightweight, sound insulation, superior thermal insulation performance, chemical resistance, good electrical properties, easy processing, low water absorption. It is mainly used in construction, automotive, aviation industry, thermal insulation structure materials. Polyurethane elastomer performance between plastic and rubber, oil resistance, abrasion resistance, low temperature resistance, aging resistance, high hardness, elasticity. It is mainly used in the shoe industry and the medical industry. Polyurethane can also make adhesives, coatings, synthetic leather, etc.

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