HDPE Processing

HDPE Processing
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Primary Contact	Michael Erskine
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HDPE block stock can be made from recycled plastic milk bottles (recycle code 4) melted in a domestic oven at around 230 degrees C.

• wikipedia http://www.bpf.co.uk/plastipedia/polymers/HDPE.aspx
• plastipedia http://www.bpf.co.uk/plastipedia/polymers/HDPE.aspx

I have tried a few processes with variable success: -

• initial tests using the Hackspace reflow toaster oven at 220-230 C
• some fun with (cheap?) silicone cookware that breaks down at cooking temperatures!
• slight fumes but not unpleasant or dangerous - appropriate ventilation employed

Further tests at home in domestic oven: -

• cleaner process - using baking tray and baking parchment
• pressing into a plywood mould to make "slugs" for milling

• 
  Bottle cuts
• 
  Arranged for neat melting
• 
  Oven melt with blue cap
• 
  Oven melt 2 stages
• 
  Milling slug on Bridgeport