Which is safer, abs or pp?

PP material is safer.

1, thermal stability: PP material has a high thermal stability, can maintain the stability of the structure and physical properties at higher temperatures. In contrast, ABS material at high temperatures will produce decomposition of substances, the release of harmful substances.

2, biocompatibility: PP material is usually more biocompatible and less irritating to human tissues and body fluids, which makes PP material more common in medical and biomedical applications, surgical instruments and medical equipment.