You *should* be sure you have a plastic type that is safe for acids and whatever else you are going to use.
https://www.calpaclab.com/chemical-compatibility-charts/
See:
Phosphoric acid 10%
LDPE / HDPE at 20°C-50°C: little or no damage after 30 days.
Phosphoric acid 85%
LDPE / HDPE at...