G. C. Industries' Patented G-CAL Permeation Device offers a proven and repeatable means of generating a desired gas or vapor in nanograms/minute (ng/min) range. This gas is then mixed with a carrier gas (O2 and Nitrogen are the most common) at a controlled flow rate to obtain a known mixture in ppm or ppb.

Applications of the G-CAL Devices may include calibration of gas monitoring systems and chromatographs, accuracy check of gas detectors, and generation of known compounds into a custom application.

Lowest Temperature Sensitivity:
G-CAL units' polymer permeation rate changes range from 1% to 3% per degree C. Teflon rates can change up to 15% per degree C.

Wide Operating Range & Materials:
A G-CAL device may be used to generate concentrations from less than 10 nanograms/minute to 50,000 ng/min and over. G-CAL devices for over 100 different substances are available. The list includes some substances which are in gas phase at ambient temperature, such as CO. Click the link at the top of the page for a partial listing of available chemical compounds.

Enhanced User Safety:
Two separate polymer permeation barriers plus leak-proof sintered stainless steel disc construction are tested to withstand pressures of 300% greater than encountered in the field or laboratory.

Individual Certification:
Each G-CAL device is individually calibrated and vertified to generate a given output (ng/min) vs. temperature in degree Celsius. A graph is included with each device which shows permeation rate vs. temperature from 0 to 50ºC.

D.O.T. Shipping Exemption:
DOT-E 9969 - Rev. 1, based on the inherently safe design of G-CAL Permeation Devices, permits their shipment quickly by overnight air or economically by small package surface the same way as any non-hazardous materials.