Ripstop canvas is a durable and versatile fabric commonly used in outdoor gear and equipment. The "420gsm" in its name refers to the weight of the fabric, specifically 420 grams per square meter. GSM stands for "grams per square meter" and is a measurement of the weight or density of a fabric. A higher GSM indicates a heavier, denser and more durable fabric. Beware though, going too dense can affect the flexibility and use of the product, making it too hard to roll up.

The production of ripstop canvas involves several steps. It begins with the selection and blending of high-quality yarns, usually made from materials like cotton, polyester, or a blend of both. These yarns are then spun into threads, which are subsequently woven into a canvas using specialized looms.

Ripstop canvas is characterized by its unique weaving technique, which helps prevent tears and rips from spreading. This is achieved by incorporating a grid pattern of thicker reinforcement threads into the fabric. These reinforcement threads are usually made of nylon or polyester and are interwoven in a crosshatch pattern at regular intervals. If a tear occurs, the reinforcement threads prevent it from extending further, making the fabric more resistant to damage.

Waterproofing canvas is crucial for several reasons. First and foremost, it helps protect the contents of whatever is made from the canvas, such as tents, backpacks, or awnings, from getting wet. This is especially important in outdoor settings where exposure to rain, snow, or other moisture is likely.

Furthermore, waterproofing prolongs the lifespan of the canvas itself. By creating a barrier against water, it prevents the fabric from absorbing moisture, which can lead to mold, mildew, and rot. Waterproofing also enhances the fabric's resistance to staining and dirt, making it easier to clean and maintain.

Different methods can be employed to waterproof canvas. Wetting down and letting canvas bake in the sun is a traditional method that can offer a great level of water resistance to canvas. This method takes advantage of the natural properties of canvas fibers to swell and tighten when wet, creating a barrier against water penetration. The heat from the sun helps in the drying process and can further enhance the water resistance of the fabric.

In conclusion, 420gsm ripstop canvas is a robust fabric made by weaving high-quality yarns into a dense and tear-resistant material. The inclusion of reinforcement threads in a grid pattern further enhances its durability. Waterproofing canvas, regardless of its weight or construction, is essential for safeguarding the fabric itself and the items made from it, ensuring they remain dry, protected, and in good condition even in wet or unpredictable weather conditions.