Water penetration resistance (WP)
WP, derived from the English term "Water Penetration," refers to water penetration resistance and describes a material's ability to repel water. It is a critical indicator of the waterproofness of workwear, especially in damp and rainy work environments.
Classification and Measurement:
Water Penetration Resistance (Waterproofness): This resistance is classified into classes 1 to 3. Class 3 has the highest water penetration resistance and thus meets the highest requirements. WP is measured in Pascals and describes the hydrostatic pressure a material can withstand. Often, the term "water column" is used, with measurement in millimeters.
Water Vapor Permeability (Breathability): In contrast to water penetration resistance, this refers to a textile's ability to allow water vapor to pass through, with classification also possible in classes 1 to 3. Class 3 is characterized by the lowest water vapor permeability, indicating the highest breathability. Water vapor permeability, also known as the Ret value, is measured in m²*Pa/W. A garment in class 1 must also bear the label "limited wearing time."
Norms and Standards:
EN 343: Defines requirements for rain protective clothing and covers both waterproofness (WP) and breathability. EN 342: Addresses cold protection, with an optional WP test.
Relevance in Workwear: Workwear worn in humid, rainy, or water-prone environments should have a high WP value. This ensures not only wearer comfort but also the safety of the wearer, especially in cold or windy conditions.
Classification and Measurement:
Water Penetration Resistance (Waterproofness): This resistance is classified into classes 1 to 3. Class 3 has the highest water penetration resistance and thus meets the highest requirements. WP is measured in Pascals and describes the hydrostatic pressure a material can withstand. Often, the term "water column" is used, with measurement in millimeters.
Water Vapor Permeability (Breathability): In contrast to water penetration resistance, this refers to a textile's ability to allow water vapor to pass through, with classification also possible in classes 1 to 3. Class 3 is characterized by the lowest water vapor permeability, indicating the highest breathability. Water vapor permeability, also known as the Ret value, is measured in m²*Pa/W. A garment in class 1 must also bear the label "limited wearing time."
Norms and Standards:
EN 343: Defines requirements for rain protective clothing and covers both waterproofness (WP) and breathability. EN 342: Addresses cold protection, with an optional WP test.
Relevance in Workwear: Workwear worn in humid, rainy, or water-prone environments should have a high WP value. This ensures not only wearer comfort but also the safety of the wearer, especially in cold or windy conditions.