Poly-G 20-28 Polyol Arch Chemicals Crosslinking / Coupling / Curing Agents >> Diol / Triol PU - Prepolymers SEALANT Poly-G® 20-28 polyols offer high molecular weights and excellent resilience, difficult to obtain with conventional, all-propylene oxide polyols. High quality and reproducibility. Diol. Offers high molecular weights and excellent resilience, difficult to obtain with conventional, all-propylene oxide polyols. High quality and reproducibility.