Molding Plastics: Polystyrene & Valves

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SUMMARY

The discussion focuses on the molding and shaping of plastics, specifically polystyrene and polycaprolactone. Polystyrene, commonly found in yogurt tubs and CD cases, can be easily extruded and formed when heated above 95 degrees Celsius. The user seeks to create a connection to a valve for attaching a rubber tube, emphasizing the importance of a proper fit. Safety concerns regarding heating plastics are addressed, noting that while harmful gases can be released, small-scale heating poses minimal immediate health risks.

PREREQUISITES
  • Understanding of polystyrene properties and applications
  • Knowledge of polycaprolactone and its thermoforming capabilities
  • Familiarity with safety protocols for heating plastics
  • Basic skills in creating custom fittings for valves
NEXT STEPS
  • Research polystyrene thermoforming techniques
  • Explore the properties and applications of polycaprolactone
  • Investigate safety measures for heating plastics in a workshop environment
  • Learn about creating custom valve connections for tubing
USEFUL FOR

This discussion is beneficial for hobbyists, DIY enthusiasts, and professionals involved in plastic molding, as well as those interested in creating custom fittings for valves and understanding the safety aspects of working with heated plastics.

SpartanG345
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Hi

What is the easiest plastic to mold and shape once heated, and that is fairly strong once cooled down.

I was thinking of polystyrene form yogurt tubs or CD cases, because apparently if you heat it above 95 degrees it is easy to extrude and form

I want to make a connection to a valve which will make it easier to glue a rubber tube onto. I also want to glue the custom made connection onto the valve i just have to make sure it fits nicely 1st.

Also is it dangerous to heat plastics? are harmful gases if they are heated using an open flame?
If there any other safety factors to conciser please let be know :)
 
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Not sure of the answer, but I would google plastic thermoforming for info. As far as danger factors... They do release gases, but if your just heating small peices I wouldn't imagine it would be that great of a danger. I used to work in a thermoforming plant and the air would get hazy with exhaust from the process... No one died or was injured, so there are no immediate health risks. Couldn't tell you about long term effects though.
 
A great plastic material is polycaprolactone. It can easily be melted with hot water and shaped by hand into any form. And it's very strong once it has cooled down.
Here is a video showing how it works

It's sold in the US as "Shapelock" (shapelock.com). But their prices are way too high.
The cheapest price I've found so far is on plaast.de. But I don't know if they ship outside of Germany.
 
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