Helium
Helium (CAS: 7440-59-7, Formula: He, MW: 4.00) is an inert noble gas renowned for its extremely low boiling point and non-flammable nature. This makes it indispensable in cryogenic applications, such as MRI and NMR imaging, due to its ability to cool superconducting magnets. It is also vital for controlled atmospheres in semiconductor manufacturing and arc welding, and used as a carrier gas in gas chromatography.
Cryogenic Applications
Helium's exceptionally low boiling point makes it the primary coolant for superconducting magnets in MRI and NMR scanners. It is essential for maintaining the extremely low temperatures required for optimal performance of these sensitive medical and scientific instruments.
Inert Atmosphere
Utilised for creating inert atmospheres in semiconductor manufacturing and arc welding processes. This prevents unwanted reactions with atmospheric components, ensuring the purity and integrity of the manufactured materials and welds.
Carrier Gas in Chromatography
Helium serves as an inert carrier gas in gas chromatography (GC). Its low molecular weight and inertness allow for efficient separation and detection of various compounds in analytical chemistry.
Leak Detection
Due to its small atomic size and inertness, helium is highly effective for leak detection in vacuum systems and high-pressure equipment. It can penetrate small apertures to pinpoint leaks accurately.
| Molecular weight | 4.00 |
|---|---|
| Empirical formula | He |
| Assay | ≥99.995% |
| Boiling point | -268.934 °C(lit.)−268.9 °C(lit.) |
| Vapour density | 0.14 (vs air) |
| Impurities tested | ≤5 ppm oxygen≤5 ppm water |
| Melting point | -272.2 °C(lit.) |
Hazard statements
- H280Contains gas under pressure; may explode if heated
Precautionary statements
- P410Protect from sunlight
| Protective equipment | Eyeshields, Gloves, half-mask respirator (EU), half-mask respirator (US), multi-purpose combination respirator cartridge (US) |
|---|---|
| Transport (UN / ADR) | UN 1046 2.2 |
| Water hazard class (WGK, DE) | 3 |
Hazard information is provided for guidance. Always consult the product Safety Data Sheet (SDS), available on request, before handling.
Documentation
Every batch ships with a Certificate of Analysis covering assay, identity and purity; the grade is confirmed against your enquiry. Safety Data Sheets and technical data sheets are available on request.
Supply & logistics
Samples for technical evaluation; bulk MOQ by grade and packaging. In-stock material ships in 7–10 working days, worldwide, with full export documentation.
What is Helium (CAS: 7440-59-7) used for?
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Helium (CAS: 7440-59-7) is primarily used in cryogenic applications like MRI and NMR cooling, as an inert atmosphere for semiconductor manufacturing and welding, and as a carrier gas in gas chromatography. It is also employed for leak detection.
What is the CAS number and formula for Helium?
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The CAS number for Helium is 7440-59-7, and its chemical formula is He.
What grade and purity does Tech Serve Solutions supply for Helium?
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Tech Serve Solutions supplies Helium with an assay of ≥99.995%. This is a high-purity grade suitable for demanding applications; TSS does not represent it as USP, BP, or EP grade.
How should Helium be handled safely?
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Helium is supplied under pressure and is classified as containing gas under pressure (H280), requiring a Warning signal word. Handle cylinders with care to prevent damage. Ensure adequate ventilation as it can cause asphyxiation in high concentrations. Refer to the Safety Data Sheet (SDS) for full guidance.
How is Helium packed, shipped, and exported?
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Helium is typically supplied in pressurised cylinders. Shipments adhere to all relevant transportation regulations, including UN 1046 2.2 classification for transport. TSS facilitates global export of this chemical.
How can I request a sample or quote for Helium?
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To request a sample or a quote for Helium, please contact our sales team through the website or by calling us directly. Provide the product name, CAS number, and desired quantity for prompt service.
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