| http://www.w3.org/ns/prov#value | - These stoppers were split into two groups, one of the groups was subjected to a white washing process (SSR stoppers 15b) and the other group was subjected to a cork like colour washing process (SSR stoppers 15c).With respect to the production process, although an extrusion is used for both types stoppers, the feed rate and temperature of the extrusion device are different in relation to the SSR st
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