Insulating spheres for tanks. The new Allplas sphere (Fig. 1) is claimed to possess several advantages over the firm's existing sphere. The spheres are blow‐moulded from polypropylene, which is used to penetrate into the joint between the two halves of the mould, thus forming a circumferential flash on the old type of sphere, this flash being formed at the expense of wall thickness at that point. In contrast, the new sphere has a bead along the joint line, this providing reinforcement at what used to be the weakest point and thus greatly improving the resistance to mechanical damage.
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