The environmentally friendly product from Kerfkore Co.

FlexGreen is an environmentally friendly product that can be used for numerous radius applications. It consists of a face of Eucalyptus fiber .080" hardboard face attached to a particleboard substrate that is made from 100% recovered and recycled fiber that is free of any added formaldehyde. The glue used in this product also contains no formaldehyde so the entire product is free of any added formaldehyde.

FlexGreen can assist in providing credit points in the US Green Building Council LEED program. It qualifies for MR 4.1, MR 4.2 and EQ 4.4 categories and may also contribute in MR 5.1. FlexGreen is available in an optional FSC® version that will help qualify for MR 7.

FlexGreen is a great product for the architectural industry. It provides a green material with a stable hardboard face that allows the flat attachment of face veneer materials by the use of hot or cold press application. Either single-ply or paper-backed veneer faces can be laminated using normal pressure, heat and time settings as with other standard core materials. It can then be machined and sanded flat prior to forming into the desired shape. Its shape can be held by gluing to a ribbed frame or applying a back to lock into needed position.

Photo Courtesy of: M. Bolhke Veneer

FlexGreen is a flexible product that can be easily bent and attached to a ribbed frame by the use of glue, nails, or staples. It is designed to be attached to horizontal shaping ribs that will result in a smooth uniform radius. Horizontal ribs spaced about 16" to 24" apart will be needed as this equalizes the bending stresses and will produce a smooth finished surface.

FlexGreen’s recommended normal bending radius is 10 inches. A smaller radius may be obtainable depending on the thickness of the material but it is best to do a test before proceeding. Bending characteristics are slightly changed when adding veneer face material as the obtainable radius could increase to 16-18".

FlexGreen is a superior alternative to bending plywood for radius fabrication. It is calibrated for uniform thickness throughout the manufacturing process and helps achieve excellent quality results without the need for putty, bondo and sanding that increases labor requirements.

FlexGreen allows for conventional fabrication methods of attaching to a rigid structure with glue and staples and then application of face material last. Its uniform thickness allows for consistent seaming abilities for easy splicing in both the vertical and horizontal direction. Its pliable substrate allows for repeatable symmetrical bending. When using contact adhesive, light to moderate pressure by hand or J-roller is adequate.

FlexGreen is available in nominal 4'x8', 8'x4', 4'x10' and 10'x4' sizes. Other optional sizes and core materials may be available by contacting the factory for more information.


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“Prior to using pre-kerfed substrates provided by Interior Products Inc., we painstakingly saw-kerfed plywood panels manually for use in radius millwork applications. Interior Products flexible substrates have cut our skilled labor costs dramatically. The variety of materials supplied by Interior Products (Kerfkore, Timberflex, Flexboard and Ultralite) lends itself to numerous applications and options: panels, doors, curtain walls, mouldings and traditional curved millwork. We can use Interior Products in applications where the weight of plywood panels would be impractical.

Using Kerfkore we can create inlays in flat panels, then bend the panel. Applying inlays to already curved surfaces is tedious, if not impossible. Designers and architects have been delighted with the creative flexibility we can offer them.

During the construction of millwork at Nationwide Arena, Columbus (Ohio) new NHL hockey arena, the designers came to us with a fabrication problem. The original design for a concession area included a steel channel in an elliptical shape suspended from the arena's ceiling. When the structural engineers reviewed the plans, they objected to the fixtures the weight was too great to be properly supported. The design team asked us to find a solution. We used Timberflex to create a curved ceiling fixture painted to mimic the steel channel. Even the steel fabricators were fooled, and the fixture was incredibly light. Interior Products gives us options that we never had before.”
Dean Hafey, Dean's Custom Fixtures (Columbus, OH)