HDPE plastics that are specifically used with essential oils in caps, diffusers, orifices, etc. are made of HDPE, also known as plastics number 2. This very high quality plastic has stronger bonds and longer chain lengths that are not broken up by essential oils. HDPE plastics will not be affected by essential oils.
These 30 mL sprayer bottles are doTERRA tested to stand up to use with essential oils.
