Recycled Polypropylene: The Future of High-Performance

Polypropylene was first developed in the 1950s by Nobel Prize-winning scientists Guilio Natta and Karl Ziegler, transforming what was once industrial waste into a valuable textile fibre.

This synthetic yarn is created from propylene gas, a by-product of the petrochemical process that was historically burnt off. Through polymerisation – a chemical reaction catalysed by titanium – these molecules are linked into long, repeating chains, forming a strong polymer structure.

Colour is introduced at the polymer stage, fusing pigments into the fibre itself rather than being applied later which gives polypropylene its exceptional colourfastness and resistance to fading. The polymer is then melted, extruded through fine spinnerets, and stretched under tension to form yarn – a process that locks in strength and durability while creating a smooth, uniform texture.

The recycling process begins with the collection of pre-consumer textile waste. Offcuts, fibres, and flawed fabrics are sourced from both in-house production and global textile partners, then shredded, melted, and converted into transparent polypropylene granules, ready to be reborn.

In a process that mirrors solution dyeing, the granules are infused with colour to achieve Zepel’s carefully curated palette. Once coloured, the granules are melted once more and spun into yarn, following the same precision method as virgin polypropylene.

The result is a recycled performance textile that mirrors the quality, strength, and finish of its original form – proof that design, durability, and sustainability can coexist seamlessly.

·         Zero water is consumed during the production process

·         Constructed from 100% pre-consumer textile waste (e.g. fibres, yarns, flawed fabrics, and off cuts)

·         Global Recycled Standard (GRS) certified Oeko-Tex 100 certified

·         UV and stain resistant

·         Water repellent

·         Bleach cleanable

·         Contains no lead-based pigments

·         40 % lower carbon footprint value than virgin polypropylene yarn

·         50 % lower carbon footprint value than virgin polyester yarn

·         70 % lower carbon footprint value than virgin acrylic yarn

·         78 % less oil consumption than virgin polypropylene yarn

·         80 % less oil consumption than virgin polyester yarn

·         85 % less oil consumption than virgin acrylic yarn

Explore the latest Zepel releases, composed of solution dyed recycled polypropylene yarns for superior performance both indoors and out.