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RTP Company Launches New Cellulose Fibre-Reinforced-PP Compounds for Eco-Friendly Durables

20 August 2013

RTP Company has unveiled a new line of custom cellulose fibre-reinforced-polypropylene (PP) compounds.

RTP Company claim these compounds, which utilise Weyerhaeuser's Thrive renewable cellulose fibre extracted from trees grown in sustainably managed forests, will facilitate the design and production of environmentally friendly products by providing favourable performance and economics to a wide range of durable applications.

"RTP Company's new cellulose fibre-reinforced-PP compounds overcome many of the obstacles that have hindered the adoption of bio-based resins and natural fibre compounds," said Will Taber, Business Manager - Emerging Technologies at RTP Company. "They will allow product developers to meet consumer demand for environmentally friendly products that are highly functional yet cost effective. Additionally, they can help processors and OEMs to meet their sustainability objectives by reducing processing costs. On multiple fronts these new compounds provide an unmatched advantage."

RTP Company says cellulose fibres are a unique reinforcement that can be incorporated into PP to provide increased strength, stiffness, and thermal performance making these compounds suitable for structural applications while providing sought after eco-friendly, renewable content.

In comparison to other natural fibres like wood, hemp, and sisal or natural fillers like wood flour and wheat straw -- cellulose fibre provides higher strength and stiffness, consistent colour, superior processability, low odour, and a reliable supply.

Advantages cellulose fibre has over glass-fibre as reinforcement in PP include: renewable content to meet sustainability objectives; lower energy consumption during processing; specific gravity reductions of 6-9% at like loadings; average cycle time reductions up to 30% for medium to thick walled parts, and reduced tool wear.

According to RTP Company statistics, compared to unreinforced PP, a homopolymer PP with 20% cellulose fibre reinforcement offers a 38% increase in tensile strength, a 75% boost in flexural modulus, and a 60°F rise in heat deflection at 66 psi (16°C at 455 kPa). Cellulose fibre reinforced PP compounds from RTP Company also offer strength and stiffness that is comparable to uncoupled glass-fibre-reinforced-PP and achieves approximately 75% of the performance of a chemically coupled glassfibre–reinforced-PP.

Cellulose fibre can also be combined with glass-fibre or impact-modified–co-polymer for materials that meet requirements of more demanding applications. These compounds can also incorporate post-consumer recycled PP to maximise their eco-friendly content. Additionally, they are fully colourable, can be overmoulded with select RTP Company thermoplastic elastomers to enhance application ergonomics, and are available worldwide from RTP Company's global network of full-service facilities that provide technical support from design through finished part production.





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