Helium CAS 7440-59-7

Helium Gas / High Purity Helium
Helium is a colorless, odorless, nonflammable noble gas with low density and excellent inert properties. It is widely used in leak detection, welding, semiconductor manufacturing, scientific research, cryogenics, and medical imaging applications.

Product Overview

Helium Gas / High Purity Helium

Helium is a colorless, odorless, nonflammable noble gas with low density and excellent inert properties. It is widely used in leak detection, welding, semiconductor manufacturing, scientific research, cryogenics, and medical imaging applications.

Wenzhou Yingyue New Materials supplies industrial grade helium and high purity helium to meet different customer requirements. Helium is chemically stable and suitable for applications requiring inert atmosphere protection, low-density gas, or high-purity process conditions.

Specifications

Parameter	Details
Product Name	Helium / High Purity Helium
Chemical Formula	He
CAS No.	7440-59-7
Molecular Weight	4.003
Boiling Point	-268.93°C
Melting Point	-272.2°C
Density	0.1785 kg/m³ at 0°C
Appearance	Colorless, odorless, nonflammable gas
Purity Grades	Industrial Grade / High Purity Grade
Typical Purity	≥99.99% / ≥99.999% / ≥99.9999%
UN No.	UN 1046
HS Code	2804.29

Packaging

Packaging Type	Specification
Gas Cylinder	40L / 47L helium gas cylinder
Cylinder Pressure	12.5–15 MPa, depending on cylinder type
Liquid Helium	10L / 25L / 50L / 100L / 250L liquid helium dewar
Small Cylinder	Available on request for laboratory use
Valve & Connection	Standard industrial valve; connection type confirmed before delivery

Final packaging, filling ratio, and dewar configuration should be confirmed with Wenzhou Yingyue New Materials before ordering.

Storage & Safety

· Store in a cool, dry, well-ventilated area away from heat and direct sunlight.

· Keep cylinders upright and secured.

· Do not store near flammable gases or oxidizers.

· Helium is nonflammable and non-toxic, but high concentrations may displace oxygen.

· Use only in well-ventilated areas.

· Handle liquid helium with cryogenic protection equipment.

· Do not attempt to modify, repair, or refill cylinders without authorization.

Applications

· Leak detection

· Semiconductor manufacturing

· MRI and cryogenic cooling

· Welding shielding gas

· Scientific research

· Laboratory analysis

· High-purity process applications

Compliance & Certification

Item	Details
HS Code	2804.29
UN No.	UN 1046
Transport Class	Class 2 — Compressed Gas
DOT / ISO / TPED	Cylinder compliance depends on destination country, cylinder standard, and transport mode. DOT, ISO, and TPED-related markings should be confirmed before shipment.