Micropearl F-100D1 Unexpanded polymeric microsphere Pierce & Stevens Extenders / Fillers SEALANT >> Putty Pierce & Stevens' family of MlCROPEARLTM products are heat expandable polymeric microspheres that possess a wide range of performance characteristics with applicability to a broad spectrum of end uses. MlCROPEARLTM will expand to form a low density sphere, creating unique and often, improved end-product properties. Expandability over a wide range of temperatures Wide scope of Performance Characteristics Putty & Synthetic Wood very good heat and solvent resistance Dry Pierce & Stevens has available MICROPEARL® unexpanded microspheres. MICROPEARL® microspheres are not coated and expand upon heating to the proper temperature Dry, unexpanded, uncoated, polymeric microsphere. Used in putties. Offers expandability over a wide range of temperatures to form a low density sphere. Gives very good heat and solvent resistance.