The influence of silicas (A-50, A-100, A-300, titanaerosil TAS) and recycling-fillers from polymers (PET, PS, epoxy), wood sawdust,  brick dust on strength properties of polymer from epoxyresin ED-20 (+ 12,5 wt% PolyethylenePolyamine) were investigated.

It is shown, that addition of 2 wt% of silicas cause to increase tensile strength of F1 (plastic deformation) as well as F2 (finally destruction). Increasing of F1 is proportional to surface area of silica: F1 grows up to 3% for A-50, up to 4% for A-100 and up to 7% for A-300 (fig.2). It is shown increasing of F2 up to 7-18% without obvious correlation with surface area of silica. The influence of silicas to tearing strength Q is various. In the same manner, Q grows proportionally to the surface area of silica. The micro-hardness M demonstrates small increasing after addition of 2 wt% of silicas.

Addition of microfillers may be effective for reinforcing in several cases. Hence, addition of ruthil (TiO₂) does not change values of F1, F2 and Q (growth to 3-3,5%). In the same time addition of epoxypolymer-poudre may increase tensile strength . Addition of PET may increase micro-hardness M .

Thus, principal possibility to improving of epoxycomposite’s properties by addition of unmodified silicas and recycling-fillers was shown.

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