Glass Permeation Model (GP, GPH)
The GP model helium calibrated leak standard was developed to be compatible with Ultra-High vacuum systems. This model is the calibrated helium leak of choice for 10-9 and 10-10 atm-cc/s leak rates and critical applications where out gassing and background signals need to be kept to a minimum. . This model is available in leak rates ranging from 10-10 to 10-5 atm-cc/s (Other rates available upon request).