About KSTONE

SHANGHAI KSTONE S-T DEVELOPMENT CO., LTD.

KSTONE is a professional manufacturer of SF6 gas handling equipment, gas testing instruments, and C4F7N gas processing solutions for the global power industry.

Established in 2013, KSTONE specializes in the development and manufacturing of equipment for gas-insulated switchgear (GIS), high-voltage electrical equipment, power utilities, and industrial gas management applications.

Our product portfolio covers SF6 gas recovery and filling systems, gas analyzers, leak detectors, vacuum pumping units, gas separation and purification equipment, and customized gas handling systems.

In addition to conventional SF6 applications, KSTONE develops equipment for environmentally friendly insulation technologies, including C4F7N-based gas mixtures used in SF6-free switchgear applications.

With an experienced engineering team, in-house manufacturing capabilities, and a commitment to continuous innovation, we provide reliable equipment and practical technical solutions to customers worldwide.

Our Core Solutions

SF6 Gas Handling Equipment

Gas recovery, vacuum pumping, filling, separation, purification, and storage solutions for GIS manufacturing and maintenance.

SF6 Gas Testing Instruments

Professional equipment for gas purity analysis, moisture measurement, leak detection, and gas quality monitoring.

C4F7N Gas Handling Solutions

Equipment for C4F7N gas mixing, recovery, separation, purification, gas composition analysis, and leak detection.

Customized Engineering Solutions

Technical support and customized gas handling systems designed for specific operating requirements.

Quality & Innovation

KSTONE is committed to product quality, technological innovation, and reliable manufacturing. Our qualifications include ISO 9001 certification, High-Tech Enterprise recognition, and Specialized and Innovative SME recognition.

We continue to develop practical gas handling technologies to support safer, more efficient, and environmentally responsible operations in the power industry.

Our main products include:

• SF6 Leak Detectors
• SF6 Dew Point Meters
• SF6 Comprehensive Testing Instruments
• SF6 Recovery, Vacuum, Separation & Purification Systems
• SF6 Mixed Gas Filling Devices
• Density Relay Calibration Equipment
• Vacuum Pumping Systems
• C4F7N Gas Instruments & Equipment
• Eco-Friendly Gas Handling Solutions

All products are designed for industrial applications in GIS, switchgear, and power equipment maintenance.

KSTONE has obtained:

• ISO9001 Quality Management System Certification
• National High-Tech Enterprise Certification
• Specialized & Innovative Enterprise Certification
• National Technology-Based SME Certification
• Double Soft Certification Enterprise

These recognitions reflect our continuous investment in technology, product development, and manufacturing quality.

KSTONE actively participates in the development and revision of national and industry technical standards for SF6 and environmentally friendly gas technologies.

• GB/T11023-2018
  High Voltage Switchgear — SF6 Gas Sealing Test Method

• DL/T1366-2023
  Sulfur Hexafluoride Gas for Power Equipment
• DL/T2756-2024
  Guidelines for Detection and Recovery of Sulfur Hexafluoride and Its Mixtures for Electrical Equipment
• DL/T1353-2024
  Technical Specification Standard for Sulfur Hexafluoride Treatment Systems

• Technical Specification Standard for Perfluoroisobutyronitrile (C4F7N) Gas Replenishment Devices

• Recommended Manufacturer of SF6 Mixed Gas GIS Tools for State Grid Corporation of China (2022 No.290)
• Member of China Electrical Equipment Industry Association
• Member of China Fluorosilicon Organic Materials Industry Association

Trusted By / Our Customers

Supporting global customers in power transmission and gas handling applications.

KSTONE is committed to providing reliable, efficient, and environmentally responsible gas handling solutions for the global power industry.

We continue to focus on SF6 management technologies and next-generation eco-friendly gas applications to support safer and greener electrical systems worldwide.