| Measurement method |
Shopper method
Graleifa
Bentson
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Shopper method
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| transmission rate |
0.01-120 ml/min (Miscellaneous Range optional)
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| differential pressure |
Range: 0-3 KPa, accuracy ： +/- 0.01 kPa (Miscellaneous Range optional)
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| effective differential pressure |
Gurley method: 1.23 kPa +/- 0.01 kPa; Schopper method: 1.00 kPa +/- 0.01 kPa or 2.50 +/- 0.01 kPa (Gas Flow rate less than 0.13 ml/L); Bentesen method: 1.47 kPa +/- 0.02 kPa
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| Sample Size |
Gurley method: 50 * 50mm, effective area: 6.42 cm ²; Schopper method: 60 * 100mm, effective area: 10.0 +/- 0.2 cm ²; Bentsen method: 50 * 50mm, effective area: 10.0 +/- 0.2 cm ²
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| Sample temperature and humidity treatment |
Pretreatment: < 40 ℃, 10-35% RH atmospheric conditions, stand for 24 h; before and after 1 h interval weighing difference is not greater than 0.25% of the Total mass, the sample is equilibrated
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