MOS

What MOS does

MOS Co., Ltd. (주식회사 엠오에스) is a privately held Korean manufacturer of precision rubber sealing components, headquartered in Yongin-si, Gyeonggi-do, South Korea. Founded in 2001 as KS Corporation and re-established under its current legal form in November 2006, the company specializes in O-rings, packings, gaskets, and CMP (Chemical Mechanical Polishing) equipment components — including membranes, flexures, and air bags — primarily serving semiconductor manufacturers and industrial machinery producers. Its proprietary MOSEZ sub-brand supplies perfluoroelastomer (FFPM) O-rings rated for temperatures up to 340°C and resistance to approximately 2,000 chemical types, targeting petrochemical, aerospace, and semiconductor plasma environments. The company holds seven Korean patents, multiple industrial design registrations, and KOLAS-certified testing capability (since 2016) with ilac MRA recognition.

The company's product portfolio is anchored in semiconductor-grade CMP membranes produced in 200mm and 300mm formats with thickness controlled within ±0.1mm and zero-defect specifications. MOS operates an in-house R&D institute established in 2013, an automated foreign substance inspection system introduced in 2019, and a MES-based smart factory system deployed in 2023. It is registered as a qualified supplier to SK hynix (since 2007) and Samsung Semiconductor (since 2010, via Ebara OEM membranes), and serves a diversified industrial customer base including POSCO, LS Electric, KCC, SIMPAC, LG Electronics, and others.

MOS operates a B2B direct sales model with quotation-based pricing on customized precision components. Revenue is generated primarily through hardware sales of sealing components, supplemented by KOLAS-accredited testing and analysis services through its R&D Center. The company reinvests approximately 10% of revenue into technology and quality development, supporting a sustained product roadmap including successive generations of multi-zone CMP membranes (8-zone in 2017, 10-zone in 2023). Distribution is direct to enterprise customers, with a minor channel relationship with Japan's Hinode for the Korean market established in 2003. The company relocated to expanded manufacturing facilities in 2024.

Name

MOS

Legal name

주식회사 엠오에스 (MOS Co., Ltd.)

Website

https://e-mos.kr

Company type

Private

Founded year

2006

Operating status

Operating

Short description

MOS Co., Ltd. is a Korean B2B manufacturer of precision rubber sealing components, including CMP equipment membranes and proprietary MOSEZ perfluoroelastomer O-rings. It supplies semiconductor manufacturers (SK hynix, Samsung) and major Korean industrial firms via direct sales from its Yongin facility.

Ownership category

akta.pro rank

Product category

Industrial Rubber Sealing Components

NAICS

Gasket, Packing, and Sealing Device Manufacturing (339991), Rubber Product Manufacturing for Mechanical Use (326291), Rubber Product Manufacturing (3262)

SIC

Gaskets, Packg & Sealg Devices & Rubber & Plastics Hose (3050), Fabricated Rubber Products, Nec (3060)

akta.pro primary industry

Seals, Gaskets & O-Rings (Industrial Elastomer) (IMANALAC)

akta.pro secondary industries

Molded & Extruded Industrial Rubber Parts (Custom Components) (IMANALAG), Adhesive, Sealant & Gasket Rubber Compounds (IMANAJAI), Seals, Gaskets & Fluid Connectors (O-rings, packings, rotary seals, quick couplers) (IMAHAGAI)

Keywords

• Precision rubber sealing
• CMP equipment parts
• Perfluoroelastomer O-rings
• Semiconductor sealing components
• Industrial gaskets and packings

Headquarters

HQ city

Yongsin

HQ country

South Korea

HQ region

Asia

Offices1 record

Markets served

GTM type

B2B

Offering type

Hardware or Manufacturing

Cost components

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

Revenue model

1. Sealing Components Manufacturing & Sales: MOS manufactures and sells precision rubber sealing components including CMP equipment parts (membranes, flexures, air bags), perfluoroelastomer O-rings (MOSEZ), industrial O-rings, packings, and gaskets. Revenue is generated through direct B2B sales to semiconductor and industrial equipment manufacturers, with products priced via quotation requests. The company invests 10% of revenue into technology and quality development.
2. Testing & Analysis Services: The company's KOLAS-certified R&D Center provides testing and analysis services for rubber materials and products, including tensile strength, hardness, density, and elongation testing. Test reports are issued with anti-forgery security measures and can be verified through the company.

Go-to-market motion1 record

Distribution channels3 records

Marketing channels4 records

Core offering

MOS manufactures and sells precision rubber sealing components, primarily for semiconductor manufacturing equipment (CMP equipment membranes, flexures, air bags) and industrial machinery. The company's product portfolio includes proprietary perfluoroelastomer O-rings under the MOSEZ brand, standard industrial O-rings in multiple rubber materials, and packings/gaskets for hydraulic and pneumatic applications. Customers include SK hynix, Samsung Semiconductor, Ebara, POSCO, LS Electric, and other Korean industrial manufacturers, supplied through direct B2B quotation-based sales.

Product overview

MOS is a rubber sealing products manufacturer offering a portfolio of hardware products centered on CMP equipment parts (membranes, flexures, air bags), perfluoroelastomer O-rings under the MOSEZ sub-brand, standard industrial O-rings, and packings and gaskets. The products serve semiconductor manufacturing, petrochemical, aerospace, and general industrial sectors. The MOSEZ brand represents high-performance perfluoroelastomer variants for extreme environments, while the CMP equipment parts are specialized components for semiconductor wafer polishing processes. Technical Information services support product selection and usage.

Differentiator

Problem solved

Functional benefit

Brands

• MOSEZ: Perfluoroelastomer O-ring product line providing excellent resistance to high temperatures, chemicals, and various gases for petrochemical, semiconductor, and aerospace industries.

Products and services

• CMP Equipment Parts Key components for CMP (Chemical Mechanical Polishing) equipment used in semiconductor wafer polishing processes, including membranes with zero defects and ±0.1mm thickness tolerance, flexures, and air bags. Supplied to semiconductor manufacturers and equipment OEMs.
• MOSEZ Perfluoroelastomer O-rings High-performance perfluoroelastomer O-rings offering resistance to high temperatures (up to 340°C) and broad chemical compatibility (~2,000 chemical types), primarily for semiconductor, petrochemical, and aerospace sealing applications in extreme environments.
• Industrial O-rings Sealing O-rings available in large, standard, and custom sizes, manufactured in multiple rubber materials for hydraulic, pneumatic, and general industrial sealing applications.
• Packings and Gaskets Sealing devices for hydraulic and pneumatic cylinders, pistons, excavators, bulldozers, industrial robots, and hydraulic elevators, made from specialized rubber and urethane-based materials with strong mechanical durability.
• KOLAS-Certified Rubber Testing Services Testing and analysis services for rubber materials and products from the KOLAS-certified R&D Center, issuing internationally recognized test reports for tensile strength, hardness, density, and elongation with anti-forgery security measures.

Quantifiable outcome

• CMP membrane thickness controlled within ±0.1mm across all areas with zero defects
• +2 more outcomes

Named customers15 records

Segments3 records

Ideal customer profiles3 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature6 records

Partnerships

One partnership is on record.

• Hinode (Japan)minorChannel Partner/ Reseller/ Distributor · 1 January 2003MOS signed an agency agreement with Japan's Hinode for the Korean market in January 2003. Under this agreement, MOS distributes Hinode products (likely sealing-related products) in Korea alongside its own manufactured products. This partnership helped MOS build its initial product portfolio and market presence before developing proprietary products.

Scale indicators6 records

Recent moves8 records

Expansion highlights5 records

Emerging players

• Entegris: Specialty materials and fluid handling provider for semiconductor fabs; overlaps with MOS on CMP-consumable and sealing-related materials supplied to SK hynix, Samsung, and other advanced-node customers.

Direct peers

• Marco Rubber & Plastics: US-based custom and standard O-ring/sealing solutions provider serving semiconductor, medical, and industrial OEMs; comparable in custom molded rubber component scope and B2B quotation-based GTM.
• Greene Tweed: US-based specialty elastomer and sealing manufacturer with a strong FFKM/perfluoroelastomer portfolio serving semiconductor, aerospace, and chemical processing — directly comparable to MOS's MOSEZ platform and CMP-equipment sealing scope.
• Apple Rubber Products: Manufacturer of standard, custom, and micro-molded rubber seals and O-rings for industrial and high-tech applications; comparable in custom elastomer sealing scope for OEM customers.
• Daemar: North American distributor/manufacturer of O-rings, seals, gaskets, and custom-molded rubber parts serving industrial OEM customers — directly comparable product portfolio and distribution model to MOS's industrial sealing line.
• Precision Polymer Engineering: Specialty elastomer seals and O-rings (FFKM, FKM, EPDM) for semiconductor, oil & gas, and life-science OEMs; closely comparable in high-purity/extreme-environment sealing technology to MOS's MOSEZ FFPM and CMP membrane business.

Broad incumbents

• Parker Hannifin (Parker O-Ring & Engineered Seals): Diversified motion and control technologies major with a global engineered seals division; competes with MOS across industrial O-rings, hydraulic/pneumatic seals, and FFKM specialty products.
• Garlock (Enpro): Industrial sealing and gasketing specialist serving chemical, petrochemical, and heavy-industry OEMs; directly comparable to MOS's packings, gaskets, and industrial hydraulic/pneumatic sealing business.
• Trelleborg Sealing Solutions: Global incumbent in polymer-based precision sealing solutions (O-rings, gaskets, custom engineered parts) for semiconductor, aerospace, and industrial OEMs — overlaps directly with MOS's O-ring/packing/gasket and industrial machinery business lines.
• Saint-Gobain (Seals & Bearings): Global materials major with engineered seals, polymer components, and specialty elastomer products for semiconductor and industrial equipment — broad incumbent comparable to MOS's industrial-sealing portfolio.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat5 records

Key risks6 records

Key highlights7 records

Customer concentration

Compliance15 records

Revenue estimate

Valuation estimate

Number of profiles

Profiles2 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 MOS