Frequently Asked Questions
What are the different types 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.
What are the preferred applications for Natur-Tec® resins?
|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, BM364T, 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 disposable & compostable cups; pouches; etc.|
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 requirements. Natur-Tec® resins do not contain any starch and are less sensitive to humidity providing increased shelf life in environment of use.
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.
Are Natur-Tec® resins certified as compostable material according to EN 13432 or ASTM D6400?
Yes! Natur-Tec® film resin is certified by BOTH TUV Austria for the “OK Compost” certification per EN13432 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 TUV Austria for the “OK Compost” certification per EN13432 standard and the American BPI according to ASTM D6400.
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 TUV-Austria (per EN 13432) or at BPI (per ASTM D6400). Such a certificate is valid only for the finished product of the tested thickness.
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.
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.
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.
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.
Which 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 impart strength|
|BF3002||Injection molding HIPS and PP grades|
|BF3001J||PE coating for water-proofing, sealability, grease resistance on paper|
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.
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.
How does moisture in resin affect 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 may be difficult to keep a stable bubble in case of injection molding or one might see pin-holding in case of extrusion coating.
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.
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.
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.
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.
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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