NatureWorks' Ingeo branded biopolymer, which is made from renewable sources such as corn and is used in a range of end-uses including clothing and textile fibres, has gained silver sustainable certification from the Cradle to Cradle Products Innovation Institute.

The Cradle to Cradle Certified programme assesses products for safety to human and environmental health, design for future use cycles and sustainable manufacturing processes.

Each product is evaluated in five categories, including material health, material reutilisation, renewable energy use, water stewardship and social responsibility.

NatureWorks worked with consulting firm McDonough Braungart Design Chemistry to collect data throughout the supply chain and assess these categories.

"NatureWorks participated in the Cradle to Cradle Certified Program process because we believe its holistic view of products is essential to understanding the true totality of sustainability," said Marc Verbruggen, president and CEO, NatureWorks.