Burial casks or vaults made by extrusion blow moulding - of high density polyethylene, to reduce wt. and cost by comparison with concrete or GRP structures

摘要

Vaults, for burials, are prefabricated as hollow generally box-shaped structures by extrusion blow moulding of a synthetic material pref. high density polyethylene. Pref. the mouldings incorporate an opening for top or side access. Pref. the moulding walls feature horizontal grooves to accommodate metallic reinforcement straps and vertical channels to accommodate tubular stiffeners pref. made of PVC. Strong enough to withstand soil pressure and conventional monuments, lighter and more waterproof than conventional masonry or concrete vaults, cheaper than the corresp. glass fibre reinforced polyester resin structures for the same purpose.