Product Short Description: Biopolymer RXPT is a high-purity xanthan gum biopolymer suspended in an ultra-clean mineral oil. Product Description: Biopolymer RXPT is a high-purity xanthan gum biopolymer suspended in an ultra-clean mineral oil. This type of polymer is unique when compared to most other polymers in oilfield drilling and completion applications. Xanthan gums are well known for their ability to provide extremely low-solids fluids with excellent carrying and suspending characteristics. This is due to their “shear thinning” properties.