How to distinguish the waterproof quality of different kinds of fabric ?

We can test the fabric by 2 ways separately.

1. Impermeable on the surface of fabric

In production, only add waterproof material on the surface of yarn, not add it in backing.

The kind of fabric can pass raining test.

Because all yarns are covered by the water repellent material. The water can not go into the yarn.

It can keep dry in the drizzle.

The kind of common waterproof fabric is popular for making bags...

2. Completely impermeable

In production, must add waterproof material on the surface of yarn & backing.

The kind of fabric can stop all water penetration.

Because all yarns are covered by the water repellent material. And the backing material is also 100% water repellent. It is like a overall barrier.

It can keep dry in the heavy rain.

In this item, the choice of backing is also very important.

PU backing is popular for Middle level waterproof(1000-5000mm).

PVC & TPU backing is popular for high level waterproof(5000-20000mm).

The kind of high grade waterproof fabric is popular for making raincoats & tents for field camping...

The higher waterproof ability means more production cost. So you can choose the best suitable waterproof for your product.