What Miyagawa Kasei Industry does

Miyagawa Kasei Industry (宮川化成工業株式会社) is a privately-held Japanese plastics and fine-ceramics manufacturer founded in 1934 and headquartered in Osaka. The company operates two principal business lines: large-tonnage plastic injection molding for automotive interior and exterior components, and fine-ceramics molding (CIM) using a proprietary recipe system compatible with most ceramic powders, developed in-house in 1986. It also operates an in-house precision mold group (Osaka Division) capable of ±0.001mm grinding and ±0.003mm EDM tolerances, and an R&D division conducting thermal analysis, flow/structural/fluid CAE analysis, and 3D printing prototyping. Core automotive customers include Mazda (41 consecutive years of VE/VA Proposal Awards), Daihatsu, Toyota Gosei, GS Yuasa, Pacific Industrial, and Press Kogyo, alongside Auto Alliance Thailand via its Srithai Miyagawa JV. Custom-manufactured parts are sold via direct, quote-based B2B contracts with no public pricing or self-serve channels.

The company runs three domestic plants (Osaka, Shiga, Hiroshima) operating 82 plastic-injection machines spanning ~60t to 2,500t+ plus 15 fine-ceramics injection machines in clean-room environments. International manufacturing is delivered through Srithai Miyagawa (Thailand, JV with Srithai Superware and Sojitz, est. 1988), Miyagawa Kasei Mexico (wholly-owned, est. 2014), and MIAPS Mexico (est. 2017), enabling regional supply to North American and ASEAN automotive clusters. Revenue is generated through hardware sales of plastic and ceramics molded parts and one-time license/sales of precision molds, with pricing tailored to customer specifications and contract terms. Ownership is concentrated within the founding Miyagawa family — Chairman Miyagawa Seishiro and President Miyagawa Shingo — with no public listing, external institutional investors, or PE/VC backing. Recent activity includes divestiture of JV stakes in Tomitec (June 2022) and DMS Tech (March 2025) alongside continued investment in wholly-owned operations; ISO 9001 and ISO 14001 certifications across all sites, and Japanese-government S-Class Energy Conservation recognition for 10 consecutive years.

Name

Miyagawa Kasei Industry

Legal name

MIYAGAWA KASEI INDUSTRY CO., LTD.

Website

https://miyagawa.co.jp

Company type

Private

Founded year

1934

Operating status

Operating

Headcount range

251–500 employees

Short description

Miyagawa Kasei Industry is a family-owned Japanese plastics and fine-ceramics manufacturer serving Mazda, Daihatsu, and other automotive OEMs with injection-molded parts, precision molds, and proprietary CIM ceramics across plants in Japan, Thailand, and Mexico.

Ownership category

akta.pro rank

Product category

Plastic and Fine Ceramics Injection Molding Manufacturing

NAICS

Plastics Product Manufacturing (3261), Industrial Mold Manufacturing (333511), Pottery, Ceramics, and Plumbing Fixture Manufacturing (327110)

SIC

Plastics Products, Nec (3089), Pottery & Related Products (3260)

akta.pro primary industry

Automotive & Transportation Injection Molded Parts (IMANAFAB)

akta.pro secondary industries

Custom Injection Molding & Contract Manufacturing (Job Shops/CMs) (IMANAFAJ), Precision & Micro Injection Molding (IMANAFAH), Electrical & Electronics Injection Molded Components (Connectors, Housings) (IMANAFAD)

Keywords

• Plastic injection molding
• Fine ceramics manufacturing
• Precision mold fabrication
• Automotive plastic components
• Ceramic injection molding

Headquarters

HQ city

Osaka

HQ country

Japan

HQ region

Asia

Offices5 records

Markets served

GTM type

B2B

Offering type

Hardware or Manufacturing

Cost components

Supply Chain, Personnel, Operations, Technology or R&D, Infrastructure

Revenue model

1. Plastic Injection Molded Products: Mass production of plastic injection molded parts for automotive (interior/exterior trim, pillars, battery cases, ventilators) and industrial applications. Revenue derived from long-term supply contracts with automotive OEMs and tier-1 suppliers.
2. Fine Ceramics Products: Manufacture and sale of fine ceramics products including translucent alumina, colored zirconia, high thermal conductivity (AlN), ESD-conductive parts, Si3N4, porous ceramics, and custom industrial components. Produced via CIM and extrusion methods.
3. Injection Molding Dies/Tools: Design, manufacture, and sale of precision injection molding dies. Custom molds for ceramics, MIM, and plastic applications, including micron-order precision molds.

Go-to-market motion2 records

Distribution channels4 records

Marketing channels4 records

Core offering

Miyagawa Kasei Industry manufactures plastic injection molded components and fine ceramic products through proprietary injection molding technology. The plastic injection molding division operates 82 molding machines (60t to over 2500t) producing automotive interior/exterior parts, battery cases, and large-scale molded products for major OEMs including Mazda and Daihatsu. The fine ceramics division uses proprietary ceramic injection molding (CIM) with recipe systems compatible with various ceramic powders to produce translucent alumina, color zirconia, AlN, Si3N4, porous ceramics, and ESD-conductive parts, supported by in-house precision mold manufacturing with micron-order tolerances.

Product overview

Miyagawa Kasei Industry is a manufacturing company offering two core product lines: Plastic Injection Molding and Fine Ceramics Molding (CIM), supported by in-house precision mold manufacturing and R&D capabilities. The plastic injection molding division operates 82 molding machines (60t to 2500t+) producing automotive components (bench ventilators, pillar/trim, center panels, battery cases) and large-scale molded products. The fine ceramics division uses proprietary ceramic injection molding (CIM) technology with recipe systems compatible with various ceramic powders, offering injection molding, extrusion molding, and powder stamping processes to produce translucent alumina, color zirconia, high thermal conductivity (AlN), ESD-conductive, Si3N4, and porous ceramic products. The company's in-house precision mold department manufactures high-accuracy molds (±0.001mm grinding, ±0.003mm EDM) for ceramics, MIM, and plastics, while the R&D department provides flow analysis, structural analysis, thermal analysis, and 3D printing prototyping services.

Differentiator

Problem solved

Functional benefit

Products and services

• Plastic Injection Molding (プラスチック成形) Plastic injection molding services producing automotive components (bench ventilators, pillar/trim parts, center panels, battery cases) and large-scale molded products. Operates 82 injection molding machines ranging from 60 tons to over 2500 tons across multiple facilities in Japan.
• Automotive Components (自動車部品) Complete automotive component portfolio including bench ventilators, pillar/trim interior parts, center panels/dashboards, battery cases, exterior paintable parts, functional components, and heat & cool forming parts. Supplies as Tier-1 to major automakers including Mazda and Daihatsu.
• Large-Scale Molding (大型成形品) Super-large injection molding capabilities exceeding 2500 tons for large automotive parts and industrial material components.
• Battery Components (バッテリー部品) High-reliability battery cases for industrial and automotive applications, including the industry's first mass-produced plastic battery case in Japan. Serves hybrid vehicle battery markets and industrial battery manufacturers.
• Fine Ceramics Injection Molding (CIM) (ファインセラミックス射出成形) Ceramic injection molding (CIM) technology using proprietary recipe systems compatible with various ceramic powders. Produces translucent alumina, color zirconia, high thermal conductivity (AlN), ESD-conductive parts, Si3N4, and porous ceramic products in complex shapes down to 0.1mm minimum hole size.
• Fine Ceramics Extrusion Molding (セラミックス押出成形) Extrusion molding process for ceramics producing continuous products with uniform cross-sections including pipes, sheets, films, and honeycomb structures.
• Fine Ceramics Powder Stamping (粉末プレス成形) Powder stamping process for ceramic products including cold isostatic pressing (CIP) molded parts.
• Precision Injection Molds (精密金型) In-house design and manufacture of precision injection molds for ceramics, metal injection molding (MIM), and plastics. Osaka Precision Mold Group achieves machining accuracy of ±0.001mm for grinding and ±0.003mm for EDM processing, focusing on micron-order precision molds for small products and fine ceramics.

Named customers8 records

Segments4 records

Ideal customer profiles3 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature5 records

Partnerships

Five partnerships are on record, tiered minor and core.

• MIAPS S.A. de C.V.minorStrategic or Co-development Partner · 1 January 2017Subsidiary established in Mexico in January 2017. Part of the company's Mexico operations.
• Miyagawa Kasei Mexico S.A. de C.V.coreStrategic or Co-development Partner · 1 January 2014Wholly-owned subsidiary established in January 2014 in El Salto, Jalisco, Mexico. Manufactures and sells automotive plastic injection molded parts to serve customers in Europe and the Americas.
• DMS Tech Co., Ltd.minorStrategic or Co-development Partner · 1 January 2005Joint venture established in Thailand in January 2005 with GP Daikyo (ジー・ピー・ダイキョー) and Srithai Miyagawa. Ownership stake transferred in March 2025.
• Srithai Miyagawa Co., Ltd. (スリタイミヤガワ)coreStrategic or Co-development Partner · 1 November 1988Joint venture with Srithai Superware (Thailand's largest plastic manufacturer) and Sojitz Corporation (Japan), established November 1988. Designs and manufactures injection molding dies and injection molded plastic parts for industrial and automotive applications. Located in Samut Prakan, Thailand. Key customer: Auto Alliance Thailand (AAT).
• Tomitec Corporation (トミテック)minorStrategic or Co-development Partner · 1 February 1984Joint venture established in February 1984 with Tokuyama Soda (徳山曹達, now Tokuyama Corporation) for fine ceramics technology development. Ownership stake transferred in June 2022.

Scale indicators7 records

Recent moves10 records

Expansion highlights5 records

Broad incumbents

• NGK Insulators: Large Japanese ceramics manufacturer producing advanced ceramic components for automotive, semiconductor, and industrial markets. Broader incumbent in fine ceramics overlapping with Miyagawa's CIM product range but with vastly greater scale and R&D.
• Toyota Boshoku: Large Japanese automotive interior systems supplier (seats, door trims, headliners) under the Toyota group. Comparable to Miyagawa's automotive interior trim focus but at much larger scale and as direct Tier-1 to OEMs.
• Kyocera: Global Japanese ceramics and electronics leader producing fine ceramics for semiconductor, automotive, and industrial markets. Overlaps with Miyagawa's CIM-based fine ceramics capabilities, particularly electronic/industrial components.
• CIE Automotive: Spanish-headquartered global automotive components supplier with extensive plastic injection molding operations. Comparable to Miyagawa's automotive plastic parts business across geographies, including Mexico exposure.

Direct peers

• Nifco: Major Japanese plastic injection molder focused on automotive engineered components (clips, fasteners, interior functional parts). Direct competitor to Miyagawa's plastic injection molding business with similar Tier-1 Japanese OEM relationships and international manufacturing footprint.
• Maruwa: Japanese manufacturer of fine ceramics, electronic components, and lighting. Directly comparable to Miyagawa's CIM capability for advanced ceramics (alumina, zirconia, AlN) used in electronics and industrial applications.
• Pacific Industrial: Japanese Tier-1 automotive parts supplier (tire valves, plastic components) recognized as Miyagawa customer (Special Award 2022). Shares automotive plastic injection molding focus with significant Japan OEM exposure.
• Ichii Industries: Japanese plastic injection molder specializing in automotive interior and exterior trim, supplying Mazda among others. Directly comparable to Miyagawa's automotive trim and large-tonnage molding business, including the Hiroshima Tier-1 relationship with Mazda.
• Mutsumi Industries: Japanese automotive plastic parts supplier (interior/exterior trim, functional components) comparable to Miyagawa's Tier-1 automotive plastic injection molding activities for Japanese OEMs.

Others

• Nitto Boseki (Nittobo): Japanese specialty materials manufacturer with ceramics and glass fiber operations. Adjacent supplier of ceramic materials and processes relevant to fine ceramics production.

Market position

Strengths5 records

Weaknesses4 records

Competitive moat5 records

Key risks5 records

Key highlights7 records

Customer concentration

Compliance2 records

Revenue estimate

Valuation estimate

Number of profiles

Profiles2 records

Subsidiaries5 records

Funding overview

Funding rounds

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about Miyagawa Kasei Industry