Injectable composite material, comprising: (a) 28 to 95 wt.% of a polypropylene-polyethylene copolymer comprising from 10 to 90 mol.% of ethylene; (b) 0 to 10 wt.% of flow enhancer, the flow enhancer being a polymer having a melt index of between 200 and 2000 g/10 min at 230 °C under a load of 2.16 kg and being selected from the group consisting of a polypropylene homopolymer, a polypropylene copolymer, a polyethylene homopolymer and a polyethylene copolymer; (c) 1 to 20 wt.% of an impact modifier selected from the group consisting of ethylene-propylene-diene monomer (EPDM), ethylene-propylene monomer (EPM), ethylene-propylene rubber (EPR), polyolefin elastomers (POE), copolymers and terpolymers based on ethylene and propylene, nitrile-butadiene rubber (NBR), isobutylene (IB), chlorinated rubber, poly(styrene-butadienestyrene) (SBS), styrene-ethylene-butene-styrene copolymer (SEBS), isobutylene-isoprene rubber (IIR), styrene-isoprene-styrene copolymer (SIS), chlorinated polyethylene (CM), isoprene, ethylene-butene, and their mixtures and derivatives, in particular grafted with maleic acid and/or maleic acid anhydride; (d) 1 to 20 wt.% of a compatibilizing agent selected from the group consisting of polyolefins grafted with a carboxylic acid or one of its esters or anhydrides; and (e) 3 to 70 wt.% of natural fibers selected from the group consisting of cotton, linen, hemp, Manila hemp or abaca, banana tree, jute, ramie, raffia, sisal, broom, wool, alpaca, mohair, cashmere, angora, silk, bamboo, miscanthus, kenaf, coconut, agave, sorghum, switch-grass and wood, wherein the polypropylene-polyethylene copolymer forms a matrix, the matrix being formed by the component that is present in a majority proportion. (a) 28 to 95 wt.% of a polypropylene-polyethylene copolymer comprising from 10 to 90 mol.% of ethylene; (b) 0 to 10 wt.% of flow enhancer, the flow enhancer being a polymer having a melt index of between 200 and 2000 g/10 min at 230 °C under a load of 2.16 kg and being selected from the group consisting of a polypropylene homopolymer, a polypropylene copolymer, a polyethylene homopolymer and a polyethylene copolymer; (c) 1 to 20 wt.% of an impact modifier selected from the group consisting of ethylene-propylene-diene monomer (EPDM), ethylene-propylene monomer (EPM), ethylene-propylene rubber (EPR), polyolefin elastomers (POE), copolymers and terpolymers based on ethylene and propylene, nitrile-butadiene rubber (NBR), isobutylene (IB), chlorinated rubber, poly(styrene-butadienestyrene) (SBS), styrene-ethylene-butene-styrene copolymer (SEBS), isobutylene-isoprene rubber (IIR), styrene-isoprene-styrene copolymer (SIS), chlorinated polyethylene (CM), isoprene, ethylene-butene, and their mixtures and derivatives, in particular grafted with maleic acid and/or maleic acid anhydride; (d) 1 to 20 wt.% of a compatibilizing agent selected from the group consisting of polyolefins grafted with a carboxylic acid or one of its esters or anhydrides; and (e) 3 to 70 wt.% of natural fibers selected from the group consisting of cotton, linen, hemp, Manila hemp or abaca, banana tree, jute, ramie, raffia, sisal, broom, wool, alpaca, mohair, cashmere, angora, silk, bamboo, miscanthus, kenaf, coconut, agave, sorghum, switch-grass and wood, <EOS>