Born on the jobsite from tradesmen seeking better everyday performance, OSI makes construction sealants, adhesives, foams and tapes for professional installers. Its QUAD Window & Door System brings flashing, foam and sealant together, while the company supports the products with certified training, building-science expertise and jobsite guidance. OSI also stands out for its siding sealant color-matching program, which covers more than 9,200 colors.
OSI Certified Installer Training Program
Compliance program
OSI Certified Dealer Program
Compliance program
Silco IncFrom its Mentor, Ohio headquarters, Silco Inc. develops and manufactures custom-compounded silicone and hybrid sealants and adhesives for construction applications. In business for about 30 years, the company pairs an on-site chemistry and research lab with more than 50 years of combined team experience, including a custom-color program that has produced over 450 colors since 1993. Silco also packages products under customers’ private labels, taking projects from formulation and color matching through shipment.MENTOR, OH
FenSealFounded by industry veterans, FenSeal supplies high-performance seals and weather-stripping for window and door manufacturers. Its FenShield line is made in America, with products stocked at strategically located warehouses so customers across the United States can receive shipments within two days. FenSeal also provides technical support to help customers specify or develop the right seal for an application.ONTARIO, CA
RectorSealSince its founding in Houston in 1937, RectorSeal has built its identity around solving practical problems for professional tradespeople. The company began with specialty chemical sealants, and its RectorSeal No. 5 thread sealant became a lasting plumbing-industry staple. Today, RectorSeal develops trade solutions for contractors while expanding its reach through established brands such as Shoemaker, MARS, and AmRad.HAUPPAUGE, NY
Precision Adhesives and ChemicalsBuilt from companies established in 1961 and 1963, Precision Adhesives and Chemicals is a Pennsylvania manufacturer with more than 50 years of chemical development and manufacturing experience. It is known for developing adhesive and sealant solutions for HVAC, construction, and other specialized industrial applications, including custom work and toll manufacturing for customers’ formulations.YATESVILLE, PA