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PP is used primarily for jars and closures. It is rigid and is a barrier to moisture. Polypropylene is stable at temperatures up to 220 °F (104 °C). It is autoclavable and offers the potential for steam sterilization. The compatibility of PP with high filling temperatures is responsible for its use with hot fill products.
John Landis Mason, inventor of the Mason jar. In 1858, a Vineland, New Jersey tinsmith named John Landis Mason (1832–1902) invented and patented a screw threaded glass jar or bottle that became known as the Mason jar (U.S. Patent No. 22,186.) [1] [2] From 1857, when it was first patented, to the present, Mason jars have had hundreds of variations in shape and cap design. [8]
Hexagon or hex jars – regular hexagonal prism; Mason jars – moderately tall cylinder typically used in home canning, sealed with a metal lid; Kilner jar – similar to a Mason jar but sealed with rubber; Straight-sided jars – cylinders with no neck. Squat straight-sided jars are suitable for creams which can be scooped out.
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Expanded polystyrene (EPS) is a rigid and tough, closed-cell foam with a normal density range of 11 to 32 kg/m 3. [47] It is usually white and made of pre-expanded polystyrene beads. The manufacturing process for EPS conventionally begins with the creation of small polystyrene beads.
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