PC-PBT-GF Preliminary HDT Testing Results

People know that I've recommended TreeD PC-PBT-GF a lot as an european alternative to ezPCCF and PCCF, and now finally with the help of TreeD I can show some results.

They got me some spools of filament that I am going to put through a lot of tests trying to understand how to best print it and how much it can do.

First thing I did was printing temperature samples, and put them straight into the oven.

• HDT/A inspired (1.8MPa): 106°
• HDT/B inspired (0.45MPa): 117°

Very good results, but still under the datasheet numbers. I read some more papers about the crystallization behavior of PC-PBT blends, and I realize that they might be slower at crystallizing than I previously thought, so I decided to quickly anneal the samples at 140° for two hours and I tested again.

Annealed samples - 140° for two hours:

• HDT/A inspired (1.8MPa): 127°
• HDT/B inspired (0.45MPa): 140°

This blew my mind as the 1.8MPa sample surpassed the datasheet test result. I am now a lot more intrigued and I want to better characterize the annealing behavior of this polymer. TLDR: safe up to at least 90° chamber, better than ezPCCF when unannealed, and comparable or better than PCCF when annealed, but further testing will come soon