Description

Helium CAS NO 7440-59-7 is a colorless, odorless, tasteless, non-toxic, inert, monatomic gas, the first in the noble gas group in the periodic table. Its unique properties, including the lowest boiling point of any element, high thermal conductivity, and non-reactivity, make it indispensable for a wide range of advanced technological and scientific applications. This high-purity gas is critical for industries requiring ultra-cold temperatures, inert atmospheres, and high-precision analytical processes.

Application

• Cryogenics & Superconductivity: Primary coolant for superconducting magnets in Magnetic Resonance Imaging (MRI) and Nuclear Magnetic Resonance (NMR) spectrometers.
• Leak Detection & Carrier Gas: Essential tracer gas for high-sensitivity leak detection in pipelines, vacuum systems, and manufacturing. Serves as a carrier gas in gas chromatography (GC).
• Welding & Manufacturing: Provides an inert shielding atmosphere for arc welding (TIG, MIG) of reactive metals like aluminum, stainless steel, and titanium to prevent oxidation.
• Aerospace & Balloons: Lifting gas for meteorological and research balloons, airships, and specialized aerospace applications due to its non-flammability and low density.
• Semiconductor & Fiber Optics: Creates ultra-pure, inert atmospheres for crystal growth (silicon, germanium) and the manufacturing of optical fibers.
• Breathing Mixtures & Diving: Used in trimix and heliox breathing gases for deep-sea diving to prevent nitrogen narcosis and oxygen toxicity.
• Pressurization & Purging: Used to pressurize liquid-fueled rockets and purge fuel tanks and piping systems in aerospace and chemical processing.
• Research & Analytical: Utilized in various laboratory research settings, including quantum computing research (dilution refrigerators) and as a quench gas in gas-filled detectors.

Basic Information

Product Name	Helium
CAS No.	7440-59-7
Molecular Formula	He
Molecular Weight	4.0026 g/mol
Synonyms	Helium-4; Atomic helium; Gaseous helium; Balloon gas; He; UN1046; UN1963; Rare gas
EINECS	231-168-5

Quality Control

Our helium is produced and handled under strict quality management systems to ensure consistent purity and performance. We supply various grades, including Ultra High Purity (UHP, 99.999%+), High Purity (HP, 99.995%+), and Industrial Grade, each meeting stringent specifications for critical applications. Every batch is supported by a detailed Certificate of Analysis (COA) verifying purity, moisture, oxygen, and hydrocarbon content. Our quality protocols align with industry standards for gas supply, ensuring reliability for medical, analytical, and manufacturing processes.

Storage

Preserve in a tightly closed container, protected from light. Store compressed gas cylinders in a secure, upright position in a well-ventilated, dry, and cool area, away from heat sources and direct sunlight. Cylinder storage temperature should not exceed 52°C (125°F). Keep valve caps on when not in use. Separate from oxidizing materials. Use appropriate pressure-regulating equipment.

Specification

Item	Specification
Appearance	Colorless Gas
Odor	Odorless
Assay (GC)	≥ 99.995% (High Purity Grade)
Oxygen (O₂)	≤ 5 ppmv
Nitrogen (N₂)	≤ 15 ppmv
Moisture (H₂O)	≤ 3 ppmv
Total Hydrocarbons (as CH₄)	≤ 1 ppmv
Hydrogen (H₂)	≤ 1 ppmv
Carbon Dioxide (CO₂)	≤ 1 ppmv
Neon (Ne)	≤ 10 ppmv

Note: Specifications can be tailored. Please contact us for the detailed technical data sheet of a specific grade.