For harsh environments where thermoplastics are not enough.
Tanaka Seisakusho specializes in thermosetting plastic compression molding in Japan, producing high-density, high-strength components.
We also support metal-to-plastic conversion for weight reduction, electrical insulation, and corrosion resistance.
A Press Capacity Built for Demanding Parts
- 24 presses in operation
- Up to 200 t press capacity
- Up to 30 kg part weight (heavy molding)
- Up to 400°C heat-resistant resins
We discuss feasibility based on your requirements and propose an appropriate direction considering material behavior and molding conditions.
Building Heat Resistance and Strength Through Molding
Thermoset resins are selected when performance such as heat resistance, electrical insulation, and chemical resistance is required.
At Tanaka Seisakusho, we optimize material characteristics and molding conditions with a focus on density, dimensional stability, and repeatable quality to deliver reliable parts for demanding applications.
Advantages of Compression Molding for Thermosets
1) Quality driven by density (stable molding with reduced defects)
Compression molding forms parts under heat and pressure inside the mold, enabling quality design focused on density and consistency.
2) Strong for geometries that are difficult with injection molding (e.g., thick or deep parts)
Many harsh-environment components require thick or deep shapes. We evaluate molding approaches to meet performance requirements.
3) Suitable for harsh requirements (heat, insulation, chemical resistance)
We support applications with strict constraints related to temperature, electricity, and chemical exposure by organizing the best material-condition combinations.
Where Thermoset Compression Molding Fits Best
Metal-to-plastic conversion
For goals such as weight reduction, insulation, corrosion resistance, and part integration, we support evaluation and production using thermoset materials.
High density / high strength components
For strength-driven designs and safety-critical requirements, we prioritize density and repeatability.
No-machining / limited finishing constraints
When post-processing should be minimized or restricted (e.g., dust control or machining limitations), we consider molding approaches accordingly.
Insert molding (metal + resin)
Integrating metal and resin can reduce assembly steps while balancing weight reduction and strength.
Proven Use in Infrastructure-Related Fields
- Power plants, transmission systems, nuclear-related applications
- Aerospace, space, large transport equipment
- Medical devices and electronic components
This English page shows only application categories (no specific customer names).
Materials We Have Experience With
- Phenolic (PF)
- Epoxy (EP)
- Unsaturated Polyester (UP)
- Melamine (MF)
- Urea (UF)
- Polyimide (PI)
Phenolic Resin High-Precision Parts
We produce phenolic resin high-precision parts for applications where dimensional stability and reliability are critical.
If you can share your requirements (dimensions, heat resistance, insulation, strength, operating environment), we can discuss feasibility and the best direction.
About Us
Tanaka Seisakusho is based in Koshu, Yamanashi, Japan, specializing in thermoset resins and compression molding.
We maintain a rare manufacturing capability in Japan with a compact expert team, supporting harsh-environment components with high reliability demands.
- Address: 4945-1 Enzan Kamihagihara, Koshu, Yamanashi, Japan
- Tel: +81-553-32-0752
- Team: 8 (5 employees + 3 directors)
A “Last Line of Defense” for Specialized Manufacturing in Japan
Companies preserving this specialized capability are becoming rare.
We take pride in being the partner who makes critical products possible—prioritizing integrity over efficiency and essential strength over trends.
As compression molding professionals, we continue shaping safety and reliability for the next generation.
