According to the provided reference, a material is considered waterproof starting from a rating of 2,000mm.
When discussing the waterproofness of materials, particularly for clothing and gear, the rating is typically expressed in millimeters (mm). This measurement refers to the "hydrostatic head" – essentially, how tall a column of water the fabric can withstand before water begins to seep through. The higher the number, the more resistant the fabric is to water penetration under pressure.
Based on the reference from Veltuff, different mm ratings correspond to varying levels of water resistance and suitability for different weather conditions:
Understanding Waterproof Ratings
| Rating | Resistance | Weather |
|---|---|---|
| Up to 2,000mm | Water resistant | Very light rain |
| 2,000mm–5,000mm | Waterproof | Light to average rain |
| 5,000mm-10,000mm | Very Waterproof | Moderate to heavy rain |
| 10,000mm and above | Highly Waterproof | Heavy rain |
As shown in the table, materials with a rating from 2,000mm up to 5,000mm are classified specifically as "Waterproof," suitable for light to average rain conditions. Ratings below 2,000mm are generally considered only "water resistant," meaning they can handle very light rain but may not hold up under more significant precipitation or pressure (like kneeling on a wet surface).
Practical Implications
- A rating of 2,000mm is the minimum threshold to be classified as waterproof, designed for protection against light rain.
- For more demanding conditions, a higher rating (5,000mm or 10,000mm+) provides better protection against moderate to heavy rain and pressure.
Understanding these ratings helps you choose appropriate gear for the expected weather conditions.
