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Hydrostatic pressure (WP) :
1. Introduction
Hydrostatic pressure WaterProofness: The outdoor fabric industry is used to call water pressure resistance, the unit is expressed by mmH2O, which means that the unit area bears the water pressure strength, under standard laboratory conditions, the fabric bears the pressure of distilled water spraying up, and records the maximum water pressure, such as the water pressure resistance of 5000mmH2O, that is, the unit area can bear the maximum pressure of 5m without leakage.
2.Commonly Used Test Standards
American standard AATCC 127;
JIS L1092B;
European standard: IS0811;
3. Test method:
Water pressure tests have before and after washing test two methods:
• Pre-washing test: domestic outdoor brands generally test the water pressure before washing, not after washing. Because the water pressure drops greatly after washing several times, it may drop about 1000-3000mmH2O;
• After washing test: Famous foreign outdoor brands generally measure water pressure resistance after 5 times of washing, and THE NORTH FACE even test water pressure resistance after 20 times of washing. Due to several times washing, the water pressure drops greatly. In such situation, coating factory or film composite factory must use better materials for processing. For example, the water pressure resistance of the coated fabric requires after 5 times of washing to reach 5000mmH2O, then the water pressure should be over 15000mmH2O before washing; Of course, this demand will lead to higher prices!
Method Air Permeability (MAP) :
1. Introduction:
Method Air Permeability: the ability of air to pass through a fabric; Under the conditions of the specified pressure difference. The airflow through the sample in a given area in a certain time is measured. And the air permeability is calculated. The airflow rate can be measured directly.
2. Test standards:
ASTM D737
European standard ISO 9237
JIS L1096;
The ventilation unit can be expressed in mm/s, cm3/cm2/s;
Water Repellent：
1. Introduction:
In the standard laboratory, distilled water is sprayed on the sample through the funnel and graded against the waterproof standard sample.
2. Test standards:
Us standard: AATCC 22;
European standard: ISO 4920;
3.Two Kinds of Water Repellent:
Ordinary Water Repellent (abbreviated as: W/R),
Durable Water Repellent (Durable Water Repellent) Outdoor fabric industry custom is called super Water Repellent, abbreviated as: DWR).
Moisture Proofness (MP):
1. Introduction:
Moisture Proofness: MP, expressed in g/m2/24h, refers to the formation of a specific humidity difference on both sides of the sample under certain standard laboratory conditions, water vapor through the sample into the dry side. By measuring the change in the weight of the moisture cup with time to find the sample of water vapor transmittance and other parameters.
2. Test Standards and Test Methods:
There are two test methods for moisture permeability: positive cup and inverted cup;
Positive cup method: ASTM E96 A, C, E; JIS L1099 A1;
Pour cup method: ASTM-E96, JIS L1099B1;
This test uses pre-wash data!
The Difference Between Moisture and Air Permeability:
Domestic outdoor practitioners and outdoor enthusiasts call Moisture Proofness, or Air Permeability into permeability directly. Moisture Proofness and Air Permeability are completely two concepts, which is the need to distinguish and correct understanding; The fabric with three functional indicators of water-proof, moisture-permeable and breathable is called waterproof and breathable fabric, which is also called windproof and waterproof and moisture-permeable fabric. It is simply understood that the rain can not enter, but the sweat can be discharged through the pores of the coating and film!
1. Introduction
Hydrostatic pressure WaterProofness: The outdoor fabric industry is used to call water pressure resistance, the unit is expressed by mmH2O, which means that the unit area bears the water pressure strength, under standard laboratory conditions, the fabric bears the pressure of distilled water spraying up, and records the maximum water pressure, such as the water pressure resistance of 5000mmH2O, that is, the unit area can bear the maximum pressure of 5m without leakage.
2.Commonly Used Test Standards
American standard AATCC 127;
JIS L1092B;
European standard: IS0811;
3. Test method:
Water pressure tests have before and after washing test two methods:
• Pre-washing test: domestic outdoor brands generally test the water pressure before washing, not after washing. Because the water pressure drops greatly after washing several times, it may drop about 1000-3000mmH2O;
• After washing test: Famous foreign outdoor brands generally measure water pressure resistance after 5 times of washing, and THE NORTH FACE even test water pressure resistance after 20 times of washing. Due to several times washing, the water pressure drops greatly. In such situation, coating factory or film composite factory must use better materials for processing. For example, the water pressure resistance of the coated fabric requires after 5 times of washing to reach 5000mmH2O, then the water pressure should be over 15000mmH2O before washing; Of course, this demand will lead to higher prices!
Method Air Permeability (MAP) :
1. Introduction:
Method Air Permeability: the ability of air to pass through a fabric; Under the conditions of the specified pressure difference. The airflow through the sample in a given area in a certain time is measured. And the air permeability is calculated. The airflow rate can be measured directly.
2. Test standards:
ASTM D737
European standard ISO 9237
JIS L1096;
The ventilation unit can be expressed in mm/s, cm3/cm2/s;
Water Repellent：
1. Introduction:
In the standard laboratory, distilled water is sprayed on the sample through the funnel and graded against the waterproof standard sample.
2. Test standards:
Us standard: AATCC 22;
European standard: ISO 4920;
3.Two Kinds of Water Repellent:
Ordinary Water Repellent (abbreviated as: W/R),
Durable Water Repellent (Durable Water Repellent) Outdoor fabric industry custom is called super Water Repellent, abbreviated as: DWR).
Moisture Proofness (MP):
1. Introduction:
Moisture Proofness: MP, expressed in g/m2/24h, refers to the formation of a specific humidity difference on both sides of the sample under certain standard laboratory conditions, water vapor through the sample into the dry side. By measuring the change in the weight of the moisture cup with time to find the sample of water vapor transmittance and other parameters.
2. Test Standards and Test Methods:
There are two test methods for moisture permeability: positive cup and inverted cup;
Positive cup method: ASTM E96 A, C, E; JIS L1099 A1;
Pour cup method: ASTM-E96, JIS L1099B1;
This test uses pre-wash data!
The Difference Between Moisture and Air Permeability:
Domestic outdoor practitioners and outdoor enthusiasts call Moisture Proofness, or Air Permeability into permeability directly. Moisture Proofness and Air Permeability are completely two concepts, which is the need to distinguish and correct understanding; The fabric with three functional indicators of water-proof, moisture-permeable and breathable is called waterproof and breathable fabric, which is also called windproof and waterproof and moisture-permeable fabric. It is simply understood that the rain can not enter, but the sweat can be discharged through the pores of the coating and film!
