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Eureka's Water column - less can be more!
Water column expresses, the coating which is being used for making the nylon and polyester tents waterproof. For example: 1000 mm, means that there can be 1000 mm water pressure per 1 cm² on the tent fabric, before it starts leaking through. Upward of 800 mm on the material can really be called waterproof. It's better to have a higher value, because there is a possibility that the coating wears out and the value decreases. There is no standard for water colomn testing. Eureka! measures after production, however some brands mention a value “off the roll” or before production, which of course is much higher.
For most of the Eureka! tents we use PU coating; this is the strongest and most resistant to abrasion kind of coating. However, higher value of the water column has a backside: the strength of the fabric will decrease because the chemical components of the coating are weakening the fabric fibres. Therefore the right combination of amount coating / strength fabric is very important for the best result.