What Aronkasei does

Aronkasei Co., Ltd. (アロン化成株式会社) is a Japanese plastics manufacturer established August 16, 1950 and headquartered at 2-8-6 Nishi-Shimbashi, Minato-ku, Tokyo. The company is a 100%-owned subsidiary of Toagosei Co., Ltd., a Tokyo Stock Exchange-listed diversified chemical company. As of December 2025 Aronkasei had 526 employees (including part-time), operating four domestic production bases, a dedicated R&D facility (the Monozukuri Center), seven branch offices across Japan, and one overseas manufacturing subsidiary, Aronkasei Thailand Co., Ltd., established in April 2018 on Towa Kasei Thailand's premises for elastomer compounds.

The company operates across six business domains: infrastructure products and systems (Aron Pipe sewage networks, pipe fittings, Aron-Mass); waterproofing construction methods for buildings and infrastructure; nursing care and welfare equipment under the Anju brand (launched 1993, including portable toilets with automatic wrapping and measurement, foldable shower benches, handrails, rollators, and fall-prevention products); environmental products; pet support products (Relax Cushion, Relax Bath Board); and eco-materials under the GRiNABLE sub-brand (announced 2024). Core technology centers on plastic processing and molding, with proprietary elastomer compound manufacturing capabilities. An IoT extension, the Mimamori Battery, was launched in November 2023 through a capital and business alliance with Novars Co., Ltd. (October 2022) using Novars' MaBeee connected-battery technology; it monitors appliance-usage patterns for elderly care and is delivered with a bundled 3-month service plus monthly recurring subscription.

Aronkasei runs a hybrid B2B and B2C revenue model. Infrastructure and waterproofing products are sold B2B via direct enterprise sales through seven branch offices to municipal governments and construction companies (a mix of one-time unit licensing and hardware sales). Nursing care products under Anju are distributed through retail pharmacy storefronts and the brand's own e-commerce site (anju.aronkasei.co.jp), with multiple SKUs — including the AT-E-360 entrance handrail (¥89,000 retail; ¥112,000 with step), base plate (¥52,000), step (¥23,000), and pole set (¥37,000) — covered under Japan's national long-term care insurance rental system, generating recurring, insurance-backed revenue. The Mimamori Battery sells at ¥5,980 with 3 months of service, transitioning to ¥980/month per battery (up to 6 batteries and 6 invited users per contract). Elastomer compounds are sold regionally via the Thailand subsidiary. Recent activity (2023-2026) covers new product launches (Mimamori Battery, GRiNABLE, FX-30 Seat-Type, Automatic Wrap 2 Series, Okuyuraku Slip Prevention Mat, Relax Cushion for Toy Poodles), branch reorganization (Sapporo relocation November 2023; Osaka-Hiroshima merger January 2025), organizational restructuring (December 2024), and pipe-product pricing revisions (April-June 2026).

Name

Aronkasei

Legal name

Aronkasei Co., Ltd.

Website

https://aronkasei.co.jp

Company type

Private

Founded year

1950

Operating status

Operating

Headcount range

501–1,000 employees

Short description

Aronkasei Co., Ltd. is a Japanese plastics manufacturer (founded 1950, 526 employees) producing sewage infrastructure systems, waterproofing methods, nursing care equipment under the Anju brand, eco-materials under GRiNABLE, IoT Mimamori Battery, and elastomer compounds for municipal, construction, healthcare, and consumer customers.

Ownership category

akta.pro rank

Product category

Plastic Products Manufacturing

NAICS

Plastics and Rubber Products Manufacturing (326)

SIC

Plastic Materials, Synth Resins & Nonvulcan Elastomers (2821)

akta.pro primary industry

Adult Incontinence Products (CRADALAF)

akta.pro secondary industries

Incontinence & Urological Supplies (Catheters, Briefs, Ostomy Supplies) (HSABAKAH), Industrial Hoses & Tubing (Rubber/Elastomer) (IMANALAA)

Keywords

• Plastic infrastructure products
• Nursing care equipment
• Elastomer compounds
• Waterproofing construction materials
• Eco-friendly plastics

Headquarters

HQ city

Tokyo

HQ country

Japan

HQ region

Asia

Offices5 records

Markets served

GTM type

B2B and B2C

Offering type

Hardware or Manufacturing

Cost components

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

Revenue model

1. Plastic Infrastructure Products: Manufacturing and sales of sewage pipe systems, pipe fittings, and related infrastructure products to municipal governments and construction companies
2. Nursing Care Equipment Rental and Sales: Rental and sale of nursing care welfare equipment under the Anju brand through nursing insurance (Rental under national nursing insurance system is available for eligible products)
3. Building Waterproofing Solutions: Waterproofing construction methods and related materials for buildings and infrastructure
4. Elastomer Compounds: Manufacturing and sales of elastomer compounds including operations in Thailand (Aronkasei Thailand)
5. IoT Monitoring Services (Mimamori Battery): Monthly subscription service for IoT-based elderly monitoring using connected battery technology with smartphone app; initial product includes 3 months service, then monthly fee applies

Pricing tiers

Go-to-market motion2 records

Distribution channels5 records

Marketing channels7 records

Core offering

Aronkasei manufactures and sells plastic-based products across infrastructure (sewage pipe systems, pipe fittings, waterproofing methods), nursing care (Anju-brand portable toilets, shower benches, handrails, walking aids), eco-materials (GRiNABLE), and pet support lines. It also manufactures elastomer compounds for industrial use via its Thailand subsidiary and offers an IoT elderly monitoring device (Mimamori Battery) through a partnership with Novars.

Product overview

Aronkasei Co., Ltd. is a comprehensive manufacturing company specializing in plastic products, operating across three core business domains: infrastructure systems (pipes, waterproofing), nursing care/welfare products, and eco-materials. The product portfolio includes the Anju-brand nursing care line covering excretion products (portable toilets), bathing products (shower benches, bath boards, bathtub handrails), housing safety products (handrails for toilets/entrances/steps under the At Grip brand), and mobility aids (rollators, silver carts), as well as pet support products (Relax Cushion, Relax Bath Board). The company also offers IoT-enabled care solutions through the Mimamori Battery, a connected battery device developed in partnership with Novars Corporation using MaBeee technology. Infrastructure products include Aron Pipe systems and waterproofing solutions, while the eco-materials division operates under the GRiNABLE brand. Manufacturing facilities include four domestic production sites, one R&D center, and seven branch offices, plus Aron Kasei Thailand for international operations.

Differentiator

Problem solved

Functional benefit

Brands

• 安寿 (Anju): Nursing care products brand launched in 1993, offering portable toilets, shower benches, handrails, and other care equipment
• GRiNABLE (グリネーブル)

Products and services

• Infrastructure Products and Systems (Aron Pipe and Fittings) Synthetic resin sewage pipe systems, pipe fittings (AronPipe) and related products engineered for municipal and industrial infrastructure use. Sold to construction companies, contractors, and municipal governments.
• Building Waterproofing Methods and Materials Waterproofing construction methods and related materials used for building and infrastructure protection, sold to construction companies and contractors via direct sales branches across Japan.
• Nursing Care Products (Anju Brand)

Quantifiable outcome

• Japan nursing insurance rental system coverage for eligible care products
• +1 more outcomes

Named customers3 records

Segments4 records

Ideal customer profiles4 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

AI capability1 record

Feature5 records

Partnerships

Four partnerships are on record, tiered minor and core.

• NPO WaterAid Japan (特定非 water aid)minorOthers · 1 January 2024Donation partnership for clean water initiatives in developing countries. Aronkasei donates to WaterAid Japan based on sales volume of certain products, contributing to providing clean water, toilets, and correct hygiene practices in developing nations. Donation program started in 2024 and continued in 2025 and 2026.
• Novars Co., Ltd. (ノバルス株式会社)coreTechnology or Integration · 20 October 2022Capital and business alliance for connected battery technology MaBeee (Mimamori Battery). Aronkasei took equity stake through third-party allocation and formed partnership to develop new nursing care welfare equipment and services for DX (digital transformation) of nursing care sites. MaBeee enables simple DX device development through networked battery technology. The partnership aims to expand DX services in home and facility nursing care settings through combined technical and operational expertise.
• Shiga Prefecture Takashima City (滋賀県高島市)minorOthers · 30 March 2021Donation of 1,400 liters of hypochlorous acid solution (次亜塩素酸水溶液) to elementary schools, junior high schools, certified childcare centers, and nursing care facilities in Takashima City, Shiga Prefecture. Takashima City issued a letter of appreciation to Aronkasei and Towa Kasei for COVID-19 support.
• Towa Kasei Thailand Co., Ltd. (トウアゴウセイ・タイランド)coreTechnology or Integration · 25 April 2018Aronkasei Thailand Co., Ltd. was established within the premises of Towa Kasei Thailand on the premises of Towa Kasei Thailand for manufacturing and selling elastomer compounds. This represents co-location with a related group company in Thailand for production synergies.

Scale indicators5 records

Recent moves6 records

Expansion highlights7 records

Regional players

• TOTO Ltd. Major Japanese manufacturer of bathroom fixtures, plumbing equipment, and housing products. Comparable in infrastructure-related plumbing/water systems serving Japanese construction and renovation markets, with significant overlap in end-customer needs for elderly-accessible bathroom equipment.

Direct peers

• Inoac Corporation: Japanese manufacturer specializing in rubber, elastomer, urethane, and plastic products for industrial, automotive, and consumer applications. Highly comparable to Aronkasei's elastomer compound business and plastics processing capability.
• Achilles Corporation: Japanese manufacturer of plastic, rubber, and urethane products serving footwear, industrial, and infrastructure markets. Directly comparable to Aronkasei's elastomer compound manufacturing and synthetic resin product portfolio.
• Paramount Bed Holdings: Japan's leading manufacturer of medical and nursing care beds, related welfare equipment, and care facility furnishings. Directly comparable to Aronkasei's Anju nursing care product line, serving the same elderly care channels and Japanese long-term care insurance rental system.
• France Bed Holdings: Major Japanese manufacturer and distributor of beds, nursing care equipment, and welfare products sold through both retail and the long-term care insurance rental system. Closely overlaps with Aronkasei in portable toilets, handrails, mobility aids, and institutional care channels.
• JSP Corporation: Japanese plastics manufacturer specializing in foam, packaging, and resin products. Comparable in plastics processing technology and B2B industrial customer base, particularly in infrastructure-related protective and packaging materials.
• Atom Medical Corporation: Japanese manufacturer of medical and neonatal care equipment, including infant care and nursing products. Comparable to Aronkasei in the medical/welfare equipment category serving Japanese care institutions and consumers.

Broad incumbents

• Kuraray: Diversified Japanese chemical company producing resins, elastomers, and performance materials. Comparable in plastics/synthetic resin manufacturing technology, with a much broader product portfolio spanning industrial and consumer applications.
• Sekisui Chemical: Large diversified Japanese chemical and plastics manufacturer producing pipes, building materials, and housing products. Overlaps with Aronkasei's infrastructure pipe systems, waterproofing methods, and plastics manufacturing across multiple end markets.
• Toagosei Co., Ltd. Aronkasei's publicly-listed parent company; produces acrylic resins, synthetic resins, adhesives, and specialty chemicals. Closely related as the group's chemicals platform, with overlapping polymer technology and overlapping customer base in industrial applications.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat5 records

Key risks6 records

Key highlights7 records

Customer concentration

• Xx.com/aronkasei
• YouTubeyoutube.com/channel/UCN_UK2i5-u7awAK1sLgvALg
• Instagraminstagram.com/aron_anjyu
• LinkedInlinkedin.com/company/aronkasei-co-ltd-

Revenue estimate

Valuation estimate

Number of profiles

Profiles1 record

Subsidiaries1 record

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 Aronkasei