Frequently Asked Questions


What are the different kinds of resins Natur-Tec provides?

Natur-Tec has three resins commercially available for film extrusion, injection molding, and extrusion coating applications. These resins can further be tailored to suit specific application needs for increased toughness or stiffness. 

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What are the preferred applications for Natur-Tec resins?

Resins Applications
Film BF703B-X Carrier or shopping bags, trash or lawn and leaf waste bags, as well as for the production of agricultural and mulch film
Injection Molding BN252T, BM272, BM324T Biobased and biodegradable resins that can be used for making cutlery, pens, hangers, eyeglasses, cell phone covers, etc.
Extrusion Coating BM382TJ Coat various grades of paper for making disposablem & compostable cups; pouches; etc.

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What are the main advantages of Natur-Tec resins when compared to other bioplastics?

Natur-Tec resins are sold as a master batch system and can be blended in different proportions to optimize cost vs. performance and requirements. Natur-Tec resins do not contain any starch and are less sensitive to humidity providing increased shelf life in environment of use. 

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Are Natur-Tec resins approved for food contact?

Natur-Tec resins are all made from polymers; additives and/or inorganic fillers that are either FDA approved or have GRAS (Generally Regarded As Safe) status.

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Are Natur-Tec resins certified as compostable materials according to EN 13432 or ASTM D6400?

Yes! Natur-Tec film resin is certified by BOTH AIB-Vinç​otte for the "OK Compost" certification per EN 13432 standard and the American Biodegradable Products Institute (BPI) according to aSTM D6400.

The extrusion coating resin is certified by American BPI according to ASTM D6400.

Our Injection Molding resin BM324T is also certified by BOTH AIB-Vinç​otte for the "OK Compost" certification per EN13432 standard and the American BPI according to ASTM D6400.

     

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Are films and other finished products made from Natur-Tec automatically certified according to EN 13432 or ASTM D6400?

No! Film or injection molded parts made from Natur-Tec resins are not automatically certified according to EN 13432 or ASTM D6400. Each converter who wants to use the compostability mark for their products made from Natur-Tec resin must apply for a license for their films or parts at DIN Certco or AIB-Vinç​otte (per EN 13432) or at BPI (per ASTM D6400). Such a certificate is valid only for the finished products of the tested thickness.

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Do Natur-Tec resins contain harmful substances?

No! Natur-Tec develops, produces and markets its grades in compliance with international compostability and environmental standards. They pass strict heavy metal requirements and plant toxicity tests as specified in EN 13432. Natur-Tec film resins have also passed Earthworm toxicity tests (conducted by Organic Waste System (OWS) in Belgium) required by AS 4736 to obtain the Australian ABA seedling logo.

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Is it possible to print films made from Natur-Tec resins?

Films made from Natur-Tec resins can be printed without any corona treatment using offset printing or flexoprinting. 

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Is it possible to color Natur-Tec resins?

Bio-based color master batches can be used for coloring without any problems. Polyethylene/polypropylene based color master batches should not be mixed with Natur-Tec resins to remain compliant with compostability standards. 

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What equipment is necessary for processing Natur-Tec resins?

Natur-Tec resins can be processed on conventional LDPE blown film lines, PS injection molding machines or PE extrusion coating lines. Extrusion blow molding of Natur-Tec resins has also been conducted on PE lines. 

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What traditional plastic resins do Natur-Tec resins compare to?

Natur-Tec Resin Comparable Traditional Plastic Resin
BF703B-X Broad range of film resins comparable to PE for tensile strengths and elongation and with improved dart impacrt strength
BF3002 Injection molding HIPS and PP grades
BF3001J PE coating for water-proofing, sealability, grease resistance on paper

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What are the storage conditions for Natur-Tec resins in original packaging? What is the best way to store Natur-Tec resins before use?

Natur-Tec resins should be stored in a dry, cooler, frost-free place. Provided that the packaging is unopened and remains undamaged, the storage time under these conditions is minimum 6 months. 

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Do Natur-Tec resins need to be dried before processing?

Natur-Tec highly recommends the drying of its resins before processing. It is possible to process the material directly if residual moisture is below 0.2%. Depending on the storage conditions, it may be necessary to rest the residual moisture content and dry the material at 80°C for 3-4 hours. 

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How does moisture in resin effect resin processing and properties?

Moisture in resin will decrease the shelf life of your product and cause a more rapid deterioration of properties. Additionally, processing of the resin will not be consistent. It might be difficult to keep a stable bubble in case of injection molding or one might see pin-holding in case of extrusion coating. 

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Is it possible to recycle Natur-Tec trim and scrap film?

Yes. Natur-Tec resins and parts can be recycled. we recommend a maximum of 10%  feedback when combined with virgin material. However, we suggest that our customers conduct their own trials to test ultimate properties of the desired product. Also, only clean material (not transition material contaminated with PE or other traditional plastics) should be recycled. 

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Can Natur-Tec resins be blended with other traditional resins such as PE, PP, or PS?

No! Natur-Tec resins are designed for disposable compostable applications or durable biobased solutions. The resins do not blend well with plastics such as PE, PP, or PS and will deteriorate the properties of your end-product.

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What are the barrier properties of Natur-Tec resins?

Natur-Tec resins make highly breathable films compared to polyethylene films. As such the films can be used directly without the need to punch holes for breathability in some applications. This property arises naturally for all Natur-Tec resins due to the fact that these resins are biodegradable and as such absorb moisture and oxygen when in the compost environment for easy disintegration.

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What is the heat deflection temperature of Natur-Tec injection molding resins?

Natur-Tec BF3002 resin when molded at room temperature has a heat deflection temperature of 140°F (60°C) but using specific post-annealing step or molding at higher temperature this temperature can be increased to 190°F (88°C). Please contact technical service on how to improve the heat deflection temperature of these resins for your applications.

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What is the recommended end-of-life management for Natur-Tec resins?

Natur-Tec compostable products should be disposed of preferably in industrial composting facilities (following the local regulations). Landfill or incineration are not environmentally suitable options for Natur-Tec resins and defeats the value proposition of the sustainable solution.

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