REPUBLIC OF SERBIA

MINISTRY OF DEFENCE

www.mod.gov.rs

MINISTRY OF DEFENCE

Material Resources Sector

Defensive Technologies Department

Military Technical Institute

www.vti.mod.gov.rs

Investigation of SEALING of plastics parts assembly exposed to higher water pressure

Aleksandra KostiĆ

Technical Overhaul Works, Kragujevac, trzk@trzk.co.rs.

Dejan VasiĆ

Technical Overhaul Works, Kragujevac, trzk@trzk.co.rs.

Jovan RaduloviĆ

Military Technical Institute, Belgrade, vti@vti.vs.rs

Abstract: In this paper a procedure used for sealing plastics parts assembly, as well as exposure treatment of mentioned assemblies to higher and moderate water pressure are described. Specimens, made of impact resistant polystyrene and four sealing systems are used for production mentioned assemblies. Specific white silicone, modified black silicone, epoxy system consisting of modified epoxy resin and amine hardener and the solution obtained by dissolving polystyrene in toluene are used. Applied systems should prevent water pass through produced assemblies and protect indicator paper inside assemblies from water influence. Produced assemblies were sunk in a water at depth 1 m (moderate water pressure) according to SORS 0189 and 4 m (higher water pressure) according to SRPS EN 60068-2-17. Based on a detailed inspection of plastic parts in assemblies and indicator paper, it was concluded that water breakthrough did not happen and that all four applied systems are acceptable for this purpose.

Keywords: Plastics parts, assembly, sealing, higher water pressure.