These gases are mostly one component gases and are of extremely high purity in the order of 99.9993% or more. Generally at this level of purity, the amount of each impurity is present in PPM or PPB levels. The total amount of impurity in ppm or ppb is mentioned.

Proton recommends Progas grade gases for optimal functioning of your GC and other instruments. The use of Progas grade gases surpasses the need for expensive and unpredictable in line purifiers, which often demonstrate break through of contaminants. Proton recommends Progas grade gases for FID, FOD, and TCD, HID, DID etc.

Below is the list of Progas grade gases that are available ex stock from Taloja works.

Requires 99.999% (N5.0) purity helium as trace impurities increase background signal and baseline noise reducing usable discharge current resulting an impaired sensitivity.

Halogen containing species have significant electron capture cross section, which impairs sensitivity and raises the background signal. Oxygen contamination modifies detector response and increase noise. Hydrocarbons can quench signal response and generate ghost peaks.

Hydrocarbon contamination must be at a minimum in the carrier gas to prevent ghost peak, baseline drift and to reduce background noise. Hydrocarbon in air and fuel gas caused increased noise and background current.

Hydrocarbon, Carbon Dioxide and Sulphur component causes signal quenching and increased background noise.

Impurities can become concentrated or purge and trap sampling devices and inject into Gas chromatograph.

Trace impurities will cause baseline noise, signal polarity shafts reduced sensitivity and instability.

Hydrocarbon impurites increase baseline noise and oxygen reduces sensitivity.

Oxygen and moisture impurity causes filament oxidation resulting in reduced sensitivity and ghost peak.

• The first digit in code represents the number 9 s.
• The second digit in the code represent the last digit.

• 4.8 ------------ 99.998%
• 6.0 ------------ 99.9999%