Of course not all plastic is created equal (polyethylene, polypropylene, etc.) and some forms may be more prone to static than others. Be that as it may, I've been using Lee plastic powder dippers to scoop my black powder for 50 years with no issues. Smokeless powders sometimes cling to the dippers due to static but not so much black powder probably due to the graphite.

Jim Burgess
15th CVI