Application of waterproof material

Waterproofing is the process of making an object or structure waterproof or waterproof so that it is relatively unaffected by water under certain conditions and can be waterproofed. Such items can be used to a specified depth in a humid environment or underwater.

Water resistance and water resistance generally refer to the penetration of liquid water, in some cases under pressure. The penetration of water vapor into a material or structure is the water vapor permeability (MVTR).

The ships and hulls of the ships were once waterproofed with tar and asphalt. Modern items can be waterproofed by applying a waterproof coating or sealing the seams with gaskets or O-rings.

Waterproofing is used for building structures (basements, decks, wet areas, etc.), ships, canvases, clothing (raincoats and waders), electronic products and paper packaging (liquid cartons, etc.).

Some clothing and tents are designed to provide more or less protection from rain. Raincoats and jackets are used for urban purposes. In stormy weather, outdoor activities include a variety of hiking clothing. Typical descriptions are "shower resistance", "water resistance" and "water resistance". These terms are not precisely defined. Shower-proof clothes are usually treated with waterproof coatings, but they cannot withstand the specific hydrostatic head. This will prevent light rain, but water will seep in after a period of time. Waterproof clothing is similar and may be slightly resistant to water, but has not yet been rated as resistant to certain hydrostatic heads. Clothes that are described as waterproof have a water-repellent coating, and seams are also glued to prevent water from entering. Better waterproof garments have membrane linings designed to block moisture, but allow trapped moisture to escape ("breathable"). Fully waterproof clothing will retain sweat. The hydrostatic pressure rating for waterproof clothing ranges from 1,500 to 20,000.