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If you are printing a lot of ABS with heatbed >100°C I would highly recommend to use ABS or PETG for the chain and mounts.
If not PLA is fine, all 3 chains of my Anet A8 are PLA and worked perfectly for month!!

I printed both chains in PLA and now after printing 3 days ABS in an enclosure(45°C and 105°C heatbed) both chains have fallen apart. I used them for a few weeks for printing PLA or PETG without any problems, just the part under the heatbed had to be printed in ABS, PLA did not work!!

The mounts and several chain links are bent. The parts which connect the chainlinks are bent inside and can no longer be used.
I will print both chains again in ABS.