About Us

Total Gas Solutions


The Gas Professionals

Leeden NOX produces and supplies numerous gas products in various delivery formats to the region, with specific strength in the supply of electronic gas to semiconductor & electronics industry segments. We operate multiple gas production and processing facilities in Singapore, Malaysia and Indonesia. Beside supplying gas products, Leeden NOX also offers engineering & consultancy services, project management and total gas management.

Leeden NOX draws upon the technological expertise from our parent company—Nippon Sanso Holdings Corporation (NSHD), which is Japan’s largest industrial gas producer and among the top five industrial gas suppliers in the world. Our sustainability journey has already begun and we are committed to contribute solutions to address environmental and social issues.

Applications For Our Gas


Leeden NOX is a recognised leader in terms of cryogenic liquid production. We operate one of the largest air separation plants in the region, to produce high purity nitrogen, argon, oxygen, hydrogen and carbon dioxide. We are capable of delivering these industrial gases in pipelines, tank trucks and gas cylinders based on customers’ requirements. Our stable supply of industrial gases is an essential support to a wide range of industries.

Supply of gases via pipelines

For heavy users of industrial gases (e.g. large steel plants and petrochemical complexes), air separation units or gas generators are installed on the customer’s premises or in adjacent areas, for gases to be supplied via pipelines. Customers can also have access to a stable supply of high purity nitrogen and oxygen by tapping onto our pipeline network.

Supply of liquefied gases via tank trucks

We supply liquefied gases in tank trucks to customers with medium volume usage. The delivered gases are stored in the CEs (liquefied gas storage tanks) installed on the customer’s premises.

Supply of gases via gas cylinders

Our compressed gas filling centre is equipped with the most modern vacuum systems, gas analysers and quality control systems to upkeep a consistently high-quality standard throughout the production chain. Compressed gases can be supplied in individual cylinders ranging from 2.8 litres to 50 litres in size. These portable gas cylinders are filled at our gas filling plants which run on automation and labour saving processes. We then supply the cylinders on an efficient distribution network to numerous low volume customers across a wide range of industries such as construction and metal-processing.

List of Industrial Gases

The semiconductor and electronics industries need gases with a high degree of purity and the least possible contamination. Leeden NOX’s complex production processes and advanced equipment yield ultra-pure gases. These are then packaged into specially cleaned and prepared cylinders. Throughout the entire production cycle, the properties and qualities of these gases are analysed using highly sensitive instruments to ensure they are well within customers’ specifications.

Bulk Specialty Gas Supply

Leeden NOX provides Bulk Specialty Gas Supply (BSGS) and systems to meet the high volume demand of customers. Our Bulk solutions offer cost effectiveness, consistent high product quality, minimise on-site cylinder handling and enhance safety.

Leeden NOX also carries a range of reactant, corrosive & dopant gases to meet customer specific needs.

Leeden NOX offers medical gases that comply to European Pharmacopoeia standard for respiration, anaesthesia, resuscitation, sterilisation, and medical research.
We have proven capabilities to equip hospitals with our vacuum, gas pipelines and distribution systems for oxygen, nitrous oxide, and compressed air with conformance to HTM (Health Technical Memorandum) 2022 standards.

Leeden NOX also offers a range of nurse call systems for clinics and hospitals. In addition to medical gases, Leeden NOX supplies

  • liquid nitrogen for cryosurgery, and tissue repository
  • liquid helium which is used as a coolant in MRI (Magnetic Resonance Imaging) machines.


Globally Harmonised System

Our gas cylinders are marked according to the industry cylinder colour codes and comply to Globally Harmonized System of Classification and Labelling of Chemicals (GHS).

Registered Test Centre

Leeden NOX is a recognised and registered test centre for high pressure cylinders that adhere to the standards of the European Industrial Gases Association (EIGA) and the Asia Industrial Gases Association (AIGA).

Medical Gases

  • Liquid medical Oxygen (VIE tank)
  • Entonox
  • Medical Air
  • Medical Oxygen
  • Medical Nitrogen
  • Medical Carbon Dioxide
  • Medical Nitrous Oxide
  • Medical Nitrous Oxide
  • Other research grade gases and mixtures
  • Vitolife

We design and blend every individual gas mixture in Leeden NOX’s state-of-the-art Specialty Gas Centre.
Optimum blending condition is maintained in our class 10,000 cleanroom with temperature and humidity control. Upon blending completion, the gas mixtures are homogenised to ensure complete mixing and accurate analysis.

Gas Applications

  • Laboratory
  • Environmental Testing
  • Natural Gas BTU Standards
  • Liquid / Gas Hydrocarbon Standards
  • Laser / Rare Gas Mixture
  • Engine Emission Standards
  • LEL / TLV Standards
  • Mini Series Calibration Gas

Leeden NOX is a recognised leader in terms of cryogenic liquid production and we operate one of the largest air separation plants in the region, producing high purity nitrogen, argon and oxygen to meet the needs of various industries.

For large-volume users of industrial gases such as large-scale steel works or oil and chemical refineries, large on-site plants are constructed within the premises of the customers, while Total Gas Centres (TGCs) are built adjacent to the client’s manufacturing plants. Leeden NOX utilises “onsite plants” for the supply of gases through pipelines in order to meet the customers’ high volume requirements.

Depending on the required types of industrial applications, products may be used either in liquid form or vaporised into gas by an on-site vaporisation system. Leeden NOX’s customer storage tank capacities range from 3,000 litres to 100,000 litres. Leeden NOX cryogenic tankers with capacities of up to 22,000 litres deliver liquid oxygen, liquid nitrogen and liquid argon to customers’ sites across the country. These storage tanks are installed and maintained by a team of experienced engineers.

Leeden NOX is a specialist gas supplier for the offshore diving industry, offering a wide range of gases, calibration gas mixtures, related consumables and equipment. Gases are available in various supply modes based on usage requirements.

Diving Gases

  • Heliox
  • Nitrox
  • Diving Oxygen
  • Breathing Air
Pure Gases

  • Argon
  • Helium
  • Nitrogen
  • Liquid Nitrogen
  • Air
  • Oxygen
  • Hydrogen

    Quality and Safety Assurance

    • Gases are analysed and comply with standard specification, EN12021
    • Gases and equipment comply with IMCA guidelines
    • Equipment are with DNV certification
    • RPV NEA32 valve used as king valve for Heliox diving gas
    • Cylinders internal inspection for quads are certificated personnel and high precise equipment
    • Quad parts are maintained with UK standard (ISO 17020 by UKAS)

    Supply Modes

    • Single: cylinders
    • Bundle: 16, 48, 64 cylinder quads
    • Bulk: DNV2.7-1 ISO tanker with
      • Chemical Tank : 4k ,20k Litre
      • Acid Tank : 6k, 7.6k, 17k Litre

    Find out more here.


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