Justem

What Justem does

Justem (주식회사 저스템) is a South Korean semiconductor equipment company founded in April 2016 and listed on KOSDAQ (ticker 417840) since October 2022. It designs and manufactures proprietary hardware for FOUP-level humidity and contamination control, electrostatic discharge management in OLED deposition, and low-temperature plasma surface treatment, and serves tier-1 memory IDMs (Samsung Electronics, SK Hynix, Micron), display makers, and emerging secondary battery customers.

The company's product architecture is generational. The first-generation N2 Purge System (LPM, BIP, CFB) holds over 80% global market share in semiconductor FOUP humidity control and has generated USD 75 million in cumulative exports. The second-generation JFS (Jet Flow Straightener) introduced vertical laminar flow airflow control, taking FOUP humidity from 45% down to below 1%. The third-generation JDM extends humidity control to inside and outside the FOUP, and the announced JDS combines humidity and temperature dual-control. Parallel product lines include the VIS (Vacuum Ionizing Source) for OLED evaporation-process electrostatic discharge, High Vacuum Chamber Dryers and Vacuum logistics for display, ceramic powder thermal processing and roll-to-roll systems for secondary batteries, and low-temperature plasma (≤60°C) equipment through its 97%-owned subsidiary Flam. The portfolio is protected by approximately 340+ patents across Korea, China, Japan, and Taiwan, and the in-house R&D organization (~25%+ of headcount, ~15% of revenue) was designated a "Best" Corporate Research Institute by the Ministry of Science and ICT. The latest product layer is AIP-JFS, an AI-driven airflow optimization controller that reduces humidity-control tuning time by over 60%.

Commercially, Justem operates as a direct enterprise equipment vendor with no published list pricing; contracts are individually negotiated through formal qualification cycles with major manufacturers. Recent contract signals include 100 billion KRW of VIS revenue from a domestic display customer, a 55 billion KRW OLED ESD order, a 30 billion KRW roll-to-roll equipment order from a Japanese battery equipment company, and 200-unit JFS orders (Feb/March 2024) from "M company" followed by continued expansion to ~500+ units by November 2024 and ~1,700+ units globally by November 2025. The company is funding a 920 billion KRW capital program through 2027 (Yongin Second Techno Valley third plant, R&D institute), supported by 30 billion KRW in KDB policy financing and 31.5 billion KRW in K-HERO R&D support, to scale next-generation semiconductor equipment capacity.

Name

Justem

Legal name

주식회사 저istem (주)저istem

Website

https://justem.co.kr

Company type

Public

Founded year

2016

Operating status

Operating

Short description

Justem is a South Korean KOSDAQ-listed semiconductor equipment maker that designs proprietary FOUP humidity control, OLED ESD, and plasma systems, sold directly to tier-1 memory IDMs (Samsung, SK Hynix, Micron) and display manufacturers.

Ownership category

akta.pro rank

Product category

Semiconductor Equipment - Humidity Control and Yield Improvement

NAICS

Semiconductor Machinery Manufacturing (333242), Industrial and Commercial Fan and Blower and Air Purification Equipment Manufacturing (333413)

SIC

Electronic & Other Electrical Equipment (No Computer Equip) (3600), Industrial & Commercial Fans & Blowers & Air Purifing Equip (3564), Air-Cond & Warm Air Heatg Equip & Comm & Indl Refrig Equip (3585)

akta.pro primary industry

Process Gases & Gas Delivery Consumables (Specialty/Bulk/UHP) (HDAHAGAL)

akta.pro secondary industries

HVAC & Industrial Ventilation (Chillers, AHUs, Exhaust, Filtration) (EUAEAFAE), Heat Transfer Equipment (Heat Exchangers, Boilers, Condensers) (IMAHAEAC), Electronic Specialty Gases (UHP gases for fabs) (IMAEAKAI)

Keywords

• Semiconductor equipment
• Humidity control systems
• OLED manufacturing equipment
• Plasma cleaning systems
• Semiconductor yield improvement

Headquarters

HQ city

Yongin

HQ country

South Korea

HQ region

Asia

Offices5 records

Markets served

GTM type

B2B

Offering type

Hardware or Manufacturing

Cost components

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

Revenue model

1. Semiconductor Equipment Sales: Revenue primarily from manufacturing and selling semiconductor humidity control and contamination control equipment. The company has generated significant revenue from flagship products: N2 LPM (cumulative exports of USD 75 million), JFS systems, and related solutions sold directly to global semiconductor manufacturers.
2. Display Equipment Sales: Sales of display-specific equipment including High Vacuum Chamber Dryers, Vacuum TM/LL/Passage systems, N2 Purifiers, VIS systems, and OLED high-vacuum electrostatic discharge equipment to major display manufacturers.
3. Secondary Battery Equipment Sales: Sales of secondary battery material thermal processing equipment, roll-to-roll systems, aging equipment, and ceramic powder thermal processing systems to battery manufacturers.
4. Solar Cell Equipment Sales:
5. Plasma Equipment Sales: Sales of low-temperature plasma cleaning and surface treatment systems through subsidiary company Flame (플람), serving semiconductor, display, solar, and fiber industries.

Pricing tiers

Go-to-market motion1 record

Distribution channels5 records

Marketing channels7 records

Core offering

Justem manufactures and sells semiconductor humidity control and contamination control equipment (N2 Purge System, JFS, JDM, JDS), OLED high-vacuum electrostatic discharge systems (VIS), plasma cleaning equipment via subsidiary Flam, display vacuum logistics and drying equipment, and roll-to-roll and thermal processing systems for secondary battery and solar cell manufacturers. The company sells directly to global semiconductor manufacturers (Samsung Electronics, SK Hynix, Micron), domestic display manufacturers, and battery/solar companies through enterprise sales contracts.

Product overview

Justem (주)저istem is a semiconductor humidity control and advanced industry yield improvement solution provider founded in 2016. The company offers a comprehensive portfolio of equipment and solutions across semiconductor, display, solar, and secondary battery industries. Core semiconductor products include the N2 Purge System family (LPM, BIP, CFB) for FOUP humidity control, the JFS U1/U5 airflow control devices, and the 3rd generation JDM humidity control module. Display solutions encompass High Vacuum Chamber Dryer, Vacuum logistics equipment, N2 Purifiers, and the VIS vacuum ionizing destatic device. The company also provides secondary battery heat treatment equipment, roll-to-roll systems, solar graphite boats, and plasma equipment through its subsidiary Flam. The product lineup follows a generational evolution strategy, with 1st generation N2 LPM achieving 80% global market share and world-class product status, 2nd generation JFS enabling sub-1% humidity control, and 3rd generation JDM expanding capabilities. The latest JDS integrates JFS and JDM technologies for combined humidity and temperature control.

Differentiator

Problem solved

Functional benefit

Products and services

• N2 Purge System (LPM, BIP, CFB) Semiconductor humidity and contamination control system for FOUP wafer storage containers, comprising N2 Purge Load Port (LPM), Built-In Purge (BIP), and Contamination Free Buffer (CFB) modules. Controls humidity inside FOUP and suppresses contamination during semiconductor manufacturing processes with real-time humidity monitoring, MFC flow control, and SECS/GEM software integration.
• JFS U1, U5 (Justem Flow Straightener) Airflow formation devices controlling FOUP internal humidity to 1-5% by managing humidity from EFEM inflow. JFS U5 controls FOUP humidity below 5% using EFEM internal 45% humidity air, while JFS U1 achieves 1% humidity control using external low-humidity gas (CDA, N2).
• EFEM Dehumidification Dehumidification product supplying dried air inside EFEM to control moisture-induced defects. Implements low humidity using heat exchanger power reduction technology and maintains EFEM internal humidity below 5% (circulation type) or 8% (non-circulation type) at temperatures below 40°C.
• JDM (Justem Dry Module) 3rd generation semiconductor humidity control solution reducing humidity inside and outside FOUP to below 1% in semiconductor cleanrooms with 45% ambient humidity, improving semiconductor yield by reducing humidity-related losses.
• JDS (Justem Dry System) Innovative humidity and temperature control solution combining features of 2nd generation JFS and 3rd generation JDM. Maintains FOUP internal humidity below 1%, EFEM internal humidity at 5-10%, while controlling temperature to prevent contamination and improve yield.
• AIP-JFS (AI Powered JFS) AI-based precision control system for the JFS that analyzes airflow patterns and controls velocity and intensity to optimize humidity control for each production line's processes and equipment environment, reducing humidity control optimization time by over 60%.
• High Vacuum Chamber Dryer (HVCD) Large-area vacuum drying equipment for displays achieving excellent temperature uniformity (±3°C for 10.5G substrates) and world-class drying uniformity (≤10% for 10.5G substrates). Designed with lamination for mass production operation.
• Vacuum TM, LL & Passage
• N2 Purifier
• VIS (Vacuum Ionizing Source) High-vacuum ionizing destatic device for OLED manufacturing processes. Removes static electricity caused by panel transport and Align/Masking repeated mechanical contact without affecting vacuum levels or damaging OLED panels. World's first OLED deposition process-compatible destatic device.
• Graphite Boat
• Secondary Battery Material Heat Treatment Equipment Ceramic powder heat treatment system for secondary battery heat dissipation materials and separator materials. Features world's first lamination-type plasma structure, with adjustable heat treatment temperature and reaction length.
• R To R System (Roll-to-Roll)
• Plasma Equipment (Flam subsidiary)

Quantifiable outcome

• N2 LPM achieves 80%+ global market share with USD 75 million cumulative exports
• +7 more outcomes

Named customers8 records

Segments5 records

Ideal customer profiles4 records

Technology focussed Yes

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

AI capability3 records

Feature7 records

Partnerships

Nine partnerships are on record, tiered core and minor.

• Flame (플람)coreStrategic or Co-development PartnerJustem acquired 97% of Flame's shares in March 2023 for approximately 1.8 billion KRW. Flame is a plasma technology specialist with 31 patents for low-temperature high-density plasma systems. Flame operates as a subsidiary providing plasma cleaning equipment to semiconductor, display, solar, and battery manufacturers. Flame has also developed products for First Solar and participated in national R&D projects with LG Display.
• Myongji UniversityminorStrategic or Co-development PartnerCollaborating as joint research and development partner on the K-HERO national project 'EFEM Advanced Technology Development for High-Density Semiconductor Wafer Yield Improvement' (2025-2028).
• Patent Law Firm Myungshin (특허법인명신)minorStrategic or Co-development PartnerCollaborating as joint research partner on the K-HERO national project for semiconductor equipment development (2025-2028).
• Korea Textile Research Institute (한국섬유소재연구원)minorStrategic or Co-development PartnerMOU signed in January 2025 for joint development of plasma equipment for fiber/textile applications. Collaboration aims to create eco-friendly plasma-based textile processing technology to replace chemical treatments, contributing to net-zero emissions in the textile industry.
• Samsung ElectronicscoreStrategic or Co-development PartnerMajor customer for JFS humidity control systems. Samsung has deployed JFS across its semiconductor manufacturing lines. Justem supplies the world's first airflow control solution for Samsung's yield improvement needs in advanced semiconductor processes.
• SK HynixcoreStrategic or Co-development PartnerMajor customer receiving maximum-scale humidity control solution supply. SK Hynix uses Justem's N2 LPM and JFS products in HBM production lines across Taiwan, Japan, and Singapore facilities.
• Micron TechnologycoreStrategic or Co-development PartnerN2 LPM equipment successfully evaluated at Micron's Boise Technology Innovation Center in Idaho. Products already supplied to Micron's Japan, Taiwan, and Singapore HBM lines. Dedicated overseas sales team maintained for Micron accounts.
• S&S Tech (에스앤에스텍)minorStrategic or Co-development PartnerSubsidiary Flame collaborated with S&S Tech to jointly develop blanket mask surface processing equipment using low-temperature high-density plasma technology. Equipment under final testing for deployment in semiconductor photolithography processes.
• LG DisplayminorStrategic or Co-development PartnerParticipating as demand company in national R&D project for BM multi-jet plasma equipment for high-resolution OLED core component manufacturing technology. Project led by Korea Display Research Consortium.

Scale indicators26 records

Recent moves11 records

Expansion highlights6 records

Broad incumbents

• Tokyo Electron (TEL): Global semiconductor equipment leader offering coater/developers, EFEM modules, and humidity-related environmental control. Overlaps with Justem's EFEM-adjacent humidity solutions and is a key competitive reference point for major memory IDM customers.
• Lam Research: Global semiconductor wafer fabrication equipment leader with deep presence in deposition, etch, and clean technologies. Represents the broad-incumbent competitive threat to Justem's humidity and contamination control solutions at major fabs.
• Entegris: US-based supplier of specialty materials, gas delivery systems, and FOUP/wafer handling products for semiconductor fabs. Directly comparable to Justem's N2 purge and FOUP contamination-control franchise, though at materially larger scale.

Direct peers

• Hanmi Semiconductor: Korean semiconductor back-end equipment supplier with strong exposure to HBM and advanced packaging at SK Hynix and Samsung. Comparable to Justem as a domestic equipment beneficiary of HBM capex, though serving a different process step.
• SFA Engineering: Korean listed equipment maker with display and semiconductor process tool exposure. Comparable to Justem's OLED display equipment (VIS, vacuum dryers) and shares the Korean display customer base.
• Plasma-Therm: US-based supplier of plasma etch, deposition, and surface-treatment equipment for semiconductor, MEMS, and compound semiconductor applications. Comparable to Justem's low-temperature plasma business via subsidiary Flam.
• KCTech: Korean KOSDAQ-listed maker of semiconductor cleaning and surface-treatment equipment. Highly comparable to Justem's plasma cleaning line via subsidiary Flam and shares a similar customer base of Korean memory makers.
• SFA Semicon: Korean semiconductor equipment company focused on back-end and front-end process tools serving memory IDMs. Comparable to Justem as a domestic semiconductor equipment supplier targeting Samsung and SK Hynix.
• AP Tech (formerly AP Systems): Korean KOSDAQ-listed equipment maker serving semiconductor and display customers with adjacent process equipment. Most relevant Korean small/mid-cap peer for Justem in fab equipment and panel-side adjacencies.

Emerging players

• Naura Technology Group: China's largest domestic semiconductor equipment supplier, expanding rapidly into etch, thermal, and clean equipment. Increasingly relevant as a regional competitor to Korean suppliers like Justem serving memory and logic fabs in Asia.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat5 records

Key risks6 records

Key highlights7 records

Customer concentration

Compliance5 records

Revenue estimate

Valuation estimate

Number of profiles

Profiles9 records

Subsidiaries1 record

Funding overview

Funding rounds1 record

Investors1 record

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 Justem