1) sinks in water 2) Acetone does not affect the material 3) burn test 1 - self extinguishes when flame is removed 4) burn test 2 - does not drip when exposed to flame Based upon these observations and using this plastic identification flow chart: (https://www.stanmech.com/uploads/2/1/0/9/21099874/plastics_identification_flow_chart.pdf) I think these parts are made from a PPE or Polyphenylene Ether.
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