| http://www.w3.org/ns/prov#value | - If the cap 5 is made of another material than polypropylene, particularly of high density polyethylene, the risk of a sealing or other damages can be avoided as these two materials have a different modulus of elasticity. [0019] The wall thickness of the PP bottle is typically in the range of 0.3 mm to 0.6 mm, preferably 0.45 mm.
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