- Phone
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Address
Shanghai
CYIPMI China Regional Service Office (Porous Measurement Int'l Group)
Shanghai
principle
♦ gas permeability
It is the volume of gas that passes through a unit area of the sample per unit time, determined by two factors: the barrier properties of the material itself and the pressure difference of the tested gas on both sides of the material. The gas permeability is related to the testing environment and the individual sample, while the gas permeability is only related to the testing sample itself and not to the environment. As for the gas permeability coefficient, it is only related to the material of the sample and is a property of the material itself.
Gas permeation rate (Q) is the volume of gas that passes through a unit area of a sample per unit time at a constant temperature and unit pressure difference, under stable permeation. The unit is cm3/m2•d•Pa。 There is a relationship between d and gas permeability, where d is the thickness of the material.Due to the difference in units between the two, it is necessary to unify the calculation units. For example, when the unit of gas permeability coefficient of a material is cm3•cm/cm2• s • Pa and the unit of gas permeability is cm3/m2When d • Pa is used, the difference in test time units introduced during the calculation process alone is 86400 times, and the difference in area units is 10000 times. Therefore, the national standard GB1038 provides 1.1574X10-9This coefficient is used for the unification of units.
specification
♦ Hardware part:
| Transmittance range | 1 x 10-101x 10-6(Microflow in cc/sec/m/torr) |
| pressurized gas | Clean, dry, and non corrosive gases (N2, AIR...) |
| Test pressure range | 0~500 PSI |
| Pressure conversion range | 0~500 PSI |
| Pressure measurement and regulation control system | fully automatic control |
| sample size | 0.5' - 2.5' diameter |
| Sample testing types | Thin film, paper, non-woven fabric, nanofiber membrane, PTFE membrane, etc |
| Range of traffic conversion | 0.00001cc~10 cc/minute |
| Flow measurement system | fully automatic control |
| sample slot | stainless steel material |
| Operation control | Can choose between automatic testing and manual operation modes |
♦ Software section: