Since 1937, glass fabricators and automotive engineers have counted on Saflex® for high quality products, reliable service, and expert advice to help deliver world class technology for laminated glass. Eastman architectural glazing products include Saflex polyvinyl butyral (PVB) interlayers for glass lamination as well as Vanceva® Colors PVB interlayers. Architects &l engineers are taking advantage of our products which include structural performance, a variety of colors, acoustic sound reduction, and solar UV protection that provide the added benefits of safety, security, and weight reduction inherent to the PVB when laminated between two pieces of glass.

About Saflex PVB interlayers


In 1938, Monsanto began manufacturing PVB resin in a joint venture with Shawinigan Resins of Canada, which resulted in the production of Saflex brand interlayer at its adjoining plant in Springfield, Massachusetts. These early interlayers offered vastly improved processing and windscreen performance compared to the previously used cellulose acetate and quickly displaced it in this application. By the early 1950s, architectural use of laminated glass began to increase and coloured interlayer products were introduced for this application. Monsanto developed a process to put a gradient color band on the automotive interlayer and began offering it commercially in 1951. In the early 1960s, Monsanto expanded its production facilities to Trenton, Michigan and Ghent, Belgium and introduced the first “HPR” (High Penetration Resistant) interlayer in 1965. This product approximately tripled the penetration resistance of windscreens and federal standards requiring laminated windscreens in the United States were enacted in 1967. In 1997, Monsanto’s chemical business was spun off to create Solutia, which merged with Eastman Chemical in 2012. Eastman Chemical remains fully committed to maintaining the Saflex leadership position and serving the laminated glass market for years to come. Eastman Chemical is recognized as a world leader in PVB interlayer and has continued to expand production facilities worldwide and meet new needs of the laminating industry with products offering superior processing, laminate performance and durability.

What is Saflex PVB interlayer?

Saflex is a plasticised polyvinyl butyral (PVB) film that bonds with glass under heat and pressure to form laminated safety glass. The Saflex interlayer sandwiched between the layers of glass is responsible for the enhanced performance properties of laminated glass. It is sold as refrigerated or interleaved rolls and is manufactured in a variety of formulations, colors, and thicknesses for use in laminated architectural, transportation and specialty glazings.

For information regarding specific product availability, contact a local Saflex representative.


Saflex® brand PVB is a film consisting of approximately 75% PVB resin and 25% plasticiser. Architectural grades of Saflex are plasticised with Santicizer® S2075 plasticiser, or trietylene glycol di-2-ethyl hexanoate. Specialty grades of Saflex have different compositions. Small quantities of other proprietary materials are added for adhesion control, ultra-violet screening agents and color.



UV, Visible and NIR Light Properties

Saflex® interlayers contain ultra violet (UV) stabilisers that significantly reduce the amount of ultraviolet light transmitted through the laminate.


Enhanced safety for architectural laminated glass

Globally, architects and designers rely on Saflex® Clear PVB interlayers in laminated glass to help meet regional standards for safety glass.

Protecting people and property, Saflex interlayer adds post-breakage safety and security to laminated safety glass applications.  Unlike monolithic glass, properly designed laminated glazing made with Saflex interlayer reduces the risk of injury from broken glass because the glass adheres to the interlayer after impact.  By holding glass in place, the interlayer provides protection by preventing the release of glass shards from becoming dangerous flying or falling glass fragments.  This may also help keep the system integral once broken—protecting the building envelope.

  • Exterior: Doors, windows, curtain walls, wall coverings, and overhead glazing.

  • ​Interior: Partitions, doors, windows, skylights, furniture, balustrades, retail shelving, flooring.

Designing security into laminated glass

The trend toward using more glass in building design has increased the need for additional protection.  Saflex® Clear interlayer addresses this need by adding reliable security features to laminated glass.  While ordinary glass windows can allow rapid entry by nefarious people, laminated glass is versatile in both preventing injuries and rapid entry while protecting the interior of the building.  Unlike monolithic glass, laminated glass made with Saflex Clear PVB interlayer helps ensure glass stays in place, and resists entry or penetration in cases of bomb blasts, ballistic attack, forced entry, or similar other types of vandalism

The security performance provided by Saflex Clear PVB interlayers is also available when combined with the Vanceva® Colors and Earth Tones interlayer systems.  The architectural Saflex and Vanceva interlayers are compatible allowing architects and designers to create safe spaces without sacrificing style or comfort. 

  • Exterior:  Doors, windows, curtain walls, wall coverings, and overhead glazing

  • Interior: Partitions, doors, windows, skylights, furniture, balustrades, retail shelving, flooring 


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