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Sujbejct 2 : Rotational moulding Research

Materials / Plastics for Rotational Moulding

AMBER uses materials such as Polyethylene, Polypropylene, Nylon 12, EBA.

POLYETHYLENE:
Polyethylene (or Polythene as it is also known) is, by far, the material most used for rotational moulding. It has ease of processing, good low temperature impact strength and excellent chemical resistance. It falls into various categories.

L.D.P.E. {Low Density Polyethylene} – This is flexible and tough, easy to process and has low strength, excellent chemical resistance.

L.L.D.P.E. {Linear Low Density Polyethylene} – Better mechanical properties than L.D.P.E. Higher stiffness, excellent low temperature impact strength and environmental stress crack resistance.

H.D.P.E. {High Density Polyethylene} – Better stiffness than the lower densities but more prone to warping during moulding and lower impact strength.

EBA Copolymer – Gives excellent low temperature flexibility. Has less strength than straight polyethylene.

POLYPROPYLENE:
AMBER is the leading processor of polypropylene in the UK. It gives excellent resistance to stress and high resistant to cracking (i.e. it has high tensile and compressive strength) and high operational temperatures with a melting point of 120°C.
It is highly resistant to most alkalis and acid, organic solvents, degreasing agents and electrolytic attack.

NYLON:
Nylon 12 – Low Moisture absorption and good chemical resistance but mechanical properties and heat resistance lower than, for example, Nylon 6. Nylon 12 is more easily processed but more expensive.
Nylon’s secondary finishing operations are more difficult than polyethylene’s.

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