a composition of matter comprising at least 2 % by weight of a fibrous material and at least 30 % by weight of a binding material such that the composition can be melt - molded into articles which have mechanical strength sufficient for their intended uses and which are biodegradable . the binding material is formed of natural substance and may also include up to 30 % by weight synthetic , water - soluble polymer . the fibrous material may be cellulose and / or mineral fibers which provide the attributes of reinforcement and degradability . the composition may further include up to 20 % by weight liquid or solid plasticizer which serves to lower melt viscosity and add toughness to the composite material .