PCTG – polycyclohexane dimethyl terephthalate modified by glycol

PCTG? My wild guess was polycarbonate technical grade. I was terribly wrong. Its expanded name is rather long that I never want reading and pronouncing. I feel like practicing a tongue twister. It is “polycyclohexane dimethyl terephthalate modified by glycol”.

Created in response to BPA issue. Not sure when and I am too lazy and too busy to dig.

Is it really BPA free? Wait until concerned institutions conduct their thorough studies. For the time being, let’s use it with no worries. Pretend that the only bad thing in plastic is BPA, none other.

According to emmarco.com, it has excellent toughness and good heat resistance at ~120˚C. It is food safe as granted by FDA, and so will not emit BPA. Generally priced about 20% higher than PC.

The same appearance and feel of common polycarbonates, the “other plastic”. I am not talking about the pure and high quality polycarbonate here. It resist squeezing. I did not try too hard to avoid intentional damage. I want it whole and sound for my new project.

It seems that not all PCTG are created equal. There are different types with different properties. Here is what I found on ptonline.com. Take note of the code “DN010” and “MN005”.

Also new from Eastman is DN010, an injection moldable PCTG with high clarity (92% light transmission) and toughness suited to replacing acrylic. Higher toughness reduces breakage and permits snap-fit designs. Another new PCTG for injection molding is MN005 for clear medical devices and packaging. It has double the normal flow rate while minimizing trade-offs in impact strength and elongation.

Going on…

My project requires cutting holes on bottom and side. I was very careful at first to prevent any unnecessary cracks. However, it proved to be very tough and took me a long time. I use more brute force for next bottle and I did it in half the time. Nice clean cut with no cracks. I think, its toughness is comparable to PET.

As of the moment, there are very few details about this polymer.


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