What is the medical standard for argon gas

99.99%. The use of medical argon implementation GB/T 4842-2006 "argon" standard, pure argon concentration of not less than 99.99%, high purity argon concentration of not less than 99.999%. Argon is a colorless, odorless monoatomic gas, the density of argon is 1.4 times that of air and 10 times that of helium.