Founded in 1948, Therm-O-Rock East, Inc. is a Western Pennsylvania manufacturer specializing in toll processing, custom blending and packaging, with expanded perlite and vermiculite at the center of its work. The family-managed company operates two plants totaling more than 140,000 square feet and also produces Prime Gro soilless growing media to order. Its in-house quality assurance program supports customers across industrial and horticultural markets, with rail, road, water and air access for worldwide shipping.
Good Earth Horticulture, IncSince 1958, family-owned Good Earth Horticulture has grown from a retail nursery into a producer and distributor of horticultural products, including professional growing media and garden soils. Based in Lancaster, New York, the company operates 10 production facilities across the United States and Canada, harvesting Canadian sphagnum peat in New Brunswick and composting bark at sites across the country. Good Earth also continues the Hoffman garden-products line acquired in 1999.LANCASTER, NY
Silbrico CorporationSilbrico Corporation has partnered in perlite since 1946, producing expanded perlite and perlite products as well as perlite-processing equipment. Its facilities use proprietary expansion technology to tailor perlite products to customer requirements, and its Hodgkins, Illinois facility also provides metal fabrication.EASTON, PA
PolyFlo, IncFounded in Schuylkill Haven in 1985, PolyFlo, Inc. compounds fluoropolymer melts in Pennsylvania, tailoring materials to customers’ melt-flow, color, and performance requirements. Now operating from a purpose-built facility in Saint Clair Industrial Park, the company combines custom compounding and tolling with hands-on quality control developed over more than four decades. PolyFlo serves manufacturers in the United States and internationally, and also compounds PEEK alongside its core fluoropolymer work.SAINT CLAIR, PA
JR Peters, IncJR Peters, Inc. is a family-run Allentown manufacturer of water-soluble fertilizers, custom formulations, and toll-produced nutrient blends for growers and retailers. Founded by Bob Peters in 1947 as a soil-testing and horticultural advisory business, it remains rooted in the Peters family and now operates as a third-generation company under Cari and John Raymond. Its on-site laboratory sits alongside production, supporting fertilizer development, quality control, and grower testing with typical sample results in about three business days.ALLENTOWN, PA