Introduction to plastic press molding

What Is Plastic Press Molding?

Plastic press molding, also known as compression molding, is a reliable manufacturing process that shapes raw plastic material into custom parts using controlled heat and pressure. Unlike other methods that force molten plastic into a mold cavity, this process places pre-measured material directly into an open mold, then closes it to apply uniform pressure until the material takes the exact shape of the mold.

This method produces parts with consistent material density and uniform strength throughout, making it ideal for large, load-bearing components that need reliable performance over time.

Our high-speed compression molding production line

Lower Tooling Cost

Unlike injection molds with complex hot runners, press molds have a simple structure, cutting tooling costs by up to 50% for most projects.

Flexible MOQ

We support orders from 10 to 100,000 pieces, no 1000+ minimum like injection molding, perfect for prototyping or small runs.

Large Part Capability

Produce parts up to 48×48 inches, far larger than standard injection molding can handle cost-effectively for large panels.

Material Versatility

Works with thermoset, thermoplastic, and fiber-reinforced composites, adding 30% more strength for heavy-duty applications.

Choosing the right process is critical. Here’s a detailed comparison to help you pick the best fit for your project:

Custom precision mold for press molded parts

ABS

Key specs: 20 kJ/m² impact strength, 1.05 g/cm³ density

Ideal for appliance housings, electronics enclosures, and automotive trim. Resists drops and daily wear without cracking.

PP (Polypropylene)

Key specs: 320°F melting point, acid/base resistant

Perfect for trays, containers, and industrial parts. Lightweight, low-cost, and withstands moderate heat and chemicals.

PC (Polycarbonate)

Key specs: 88% light transmittance, 200x impact strength of glass

Great for protective covers and lens parts. Nearly as clear as glass, but virtually unbreakable for high-impact applications.

PA (Nylon)

Key specs: 0.3 friction coefficient, self-lubricating

Used for gears and mechanical parts. Low friction reduces wear, extending equipment lifespan without extra lubrication.

Our process can produce a wide range of custom parts. Common products we manufacture include:

• Automotive interior panels and dash trim parts
• Home appliance housings and structural shells
• Electrical insulation components and connector parts
• Protective equipment covers and industrial enclosures
• Material handling trays and storage containers
• Machine brackets and load-bearing structural parts

Mold Design & Manufacturing

Rapid Prototype Production

Compression Molding

CNC Secondary Machining

Painting & Surface Finishing

Full Part Assembly

Custom Branded Packaging

Door-to-Door Global Shipping

We ensure every part meets your exact specs with our 5-step quality control process:

• Incoming material testing to verify material properties and certifications
• First article inspection (FAI) to validate mold and part dimensions
• In-process CMM dimensional checks every 2 hours during production
• Final appearance and functional testing for 100% of parts
• Drop test packaging inspection to prevent shipping damage

Mold Complexity

Simple flat part molds start at $800, while parts with custom textures or details can go up to $3,000.

Material Selection

Engineering plastics cost 20-50% more than standard materials, due to their enhanced performance properties.

Production Volume

Per-unit cost drops from ~$15 for 100 pieces to ~$2.5 for 10,000 pieces, as tooling costs are spread out.

Secondary Operations

Painting, pad printing, or assembly add small costs, but deliver fully finished parts ready for your production line.

Automotive

Interior trim, dash components, and structural panels that meet IATF 16949 automotive industry standards.

Electronics

Device housings, insulation components, and protective covers that meet RoHS and REACH requirements.

Home Appliance

Appliance outer shells, control panel parts, and trays that meet FDA food-safe standards where needed.

Industrial Equipment

Protective covers, machine brackets, and wear-resistant parts for heavy-duty industrial machinery.

Is press molding suitable for low-volume production?

Absolutely. It’s far more cost-effective than injection molding for runs under 10,000 pieces, thanks to 50% lower tooling costs and faster setup.

What tolerance can you hold with this process?

We can hold a standard tolerance of ±0.1mm for most parts, with tighter tolerances available for high-precision applications upon request.

Can you work with my custom material?

Yes. We work with a wide range of custom and specialty materials, including customer-supplied materials for specific project requirements.

Do you offer prototype services?

Yes. We can produce 1-10 prototype parts in 3-5 days to test your design before full production, so you can validate fit and function.

What file formats do you accept for designs?

We accept STEP, IGES, STL, DWG, and PDF files. Our engineers can review your design for manufacturability for free.