What is PUL fabric?
What is PUL fabric?
“Polyurethane Laminate Fabric” or PUL is a soft, flexible, hardwearing and waterproof fabric.
PUL is a laminate fabric comprised of 2 layers: a polyester fabric (typically 1mm thick) with a very thin layer of polyurethane film bonded to the reverse.Polyester is preferred to cotton because it is difficult to have a really water-resistant product using cotton.
The polyester side can be plain or printed with a design. It will retain its stretchability even with the additional polyurethane layer. This makes for an extremely resilient fabric which will last for many years.
It’s important to note that PUL remains supple and soft to the touch, unlike a cotton fabric backed with a separate plastic fabric or an ‘oil cloth’ type fabric.
For our products, we only use Eco-PUL™. In this particular version of PUL, the polyurethane is made from renewable raw materials, such as vegetable oils rather than mineral oil. Eco-PUL is a smart choice for the environment.
The high quality polyester jersey fabric and the polyurethane film are bonded to create a single layered fabric using a combination of heat, pressure and adhesion.
Eco-PUL is manufactured using a ‘green’, solvent-free adhesive in the spirit of environmental sustainability. The resulting laminated fabric – the PUL – is totally safe for health.
Eco-PUL is made in the USA from a 73% polyester, 27% polyurethane mix and meets CPSIA standards.
Let's take a closer look...
The Patterned, Polyester Side
Let’s look in more detail using a microscope – this photo shows the polyester side of the PUL with a pin for scale. The weave of the fabric and even the individual fibres are visible.
The Waterproof, Polyurethane Side
This photo shows the polyurethane laminate side of the PUL. You can see that the polyurethane has coated the polyester. However, some holes remain – these are large enough allow the fabric to ‘breathe’, but too small for water to pass through.
The 'Droplet Test'
This photo shows a droplet of water on the polyurethane side of the fabric. You can see that the droplet sits on the surface and does not soak in. This demonstrates the ‘waterproof’ aspect of the PUL.
If the polyester side comes into contact with water, it will become damp, but water will not penetrate the interior, polyurethane layer.