Properties of Starch based Plastic
Properties of Starch-based Plastics
Amongst starch-based plastics produced, Mater-Bi, (manufactured primarily from corn or potato starch), available from Novamont (Italy), is the dominant global supplier and is also the largest seller. Mater-Bi is suitable for manufacturing injection moulded pieces, films (for bags) and a starched based loose fill packaging material, fast food tableware (cutlery, cups-plates etc), food containers, and agricultural mulch film.
Mater-bi products have properties like
(i) complete biodegradability and compostability according to existing standards
(ii) performances similar to traditional plastics
(iii) water vapour permeability from 250-1000g/30um/ m2/24hours
(iv) antistaic behaviour
(v) colourability with approved pigments
(vi) wide range of mechanical properties ranging from soft to tough with no significant ageing for period of 1 year.
Under the brand of Mater-bi Novamont produces 4 types of biodegradable material based on starch blended with synthetic material. These are Class A, Class Z, Class V, and Class Y.
Class A – Products made from blend of starch with vinylic ethylene alcohol copolymers. Biodegradable, non-compostable material degrading in 2 years in liquid medium.
Class Z – Material (mainly films and sheets) made from starch and PCL in 50% Ratio. Material in this class id Biodegradable and compostable with degradation in 20-45 days in composting conditions.
Class V – Starch contents are more than 85%. Material is Biodegradable and compostable. It degrades faster than Class Z material. Material is used for EPS packaging.
Class Y – Material derived from natural cellulose. Biodegradable and compostable material is mainly used for molded, rigid and dimensionally stable products.