Yes, it's just a plastic bottle, but...
...it's sturdy and holds up to heat.  I purchased this bottle to use in a massage oil warmer.  ( The bottle fit perfectly!). When choosing this bottle, I was concerned that the plastic and seams would not hold up to the heat of the oil warmer.  That has not been the case.  Even when exposed to the highest setting of the warmer, the plastic does not soften.  The pump is high quality as well.  I have used this bottle with both oils and lotions and have not been dissatisfied.
Rating: 5 stars