I’ve raised this in private conversations a million times, so I may as well write about it (by the way, expect more frequent posts for a while).
Toys are made of plastic. Surprising, I know. However, the kind of plastic matters and is something I always feel is lost in the discussion. Surely, you toy enthusiasts know about ABS and PVC. ABS is a hard, easily painted plastic that has decent rigidity for large pieces and can hold great detail. PVC is super flexible, and very durable for building toys like Glyos or for sharp pointy things like those MSIA v-fins that would surely snap otherwise.
However, there are others; PC, PS, and POM. PC is just good for transparent parts, and should only ever be used for detail. POM is super durable, similar to nylon. It has a rigidity more like ABS but can handle being cast in very thin pieces, and in my opinion is widely neglected as a good material, usually only being used in Kotobukiya model kits, MSIA (which shocked me to learn), and some main-line Transformers. Ironically, it’s not common on the $300 Masterpiece releases.
PS is the outlier, because it’s truly useless. Why? It sucks. It has every property of ABS, except it isn’t durable at all. Despite this, it’s used in just about every model kit brand under the sun save for Flame Toys. It has some advantages, it’s lighter and cheaper, but this mostly just benefits the manufacturer. This is why I avoid most model kits, and only buy ones with either an ABS frame or full ABS construction. It’s a real shame, too, because it leads to great designs and engineering being pulled down by a soft and fragile material that simply isn’t designed to handle that kind of stress. It should have stayed back in the 80s, when models didn’t have to move.
Hopefully you’ve gained something from this, and have learned why I hate Bandai!