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Keder samples fabricated by Lightweight Structures

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About Seaman Corporation

Seaman Corporation is a privately held, multi-generational family-owned U.S. manufacturer and trusted provider of protective solutions, delivering high-performance industrial coated fabrics since 1949.

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Seaman Corporation
1000 Venture Boulevard
Wooster, Ohio 44691

330-262-1111 330-263-6950

Bristol, Tennessee

Seaman Corporation
PO Box 3946
225 N. Industrial Drive
Bristol, TN 37620

423-989-5200 423-989-5215

Whitehall, Pennsylvania

Lightweight Structures
1139 Sumner Avenue, STE 1
Whitehall, PA 18052

610-435-4720 610-465-8866

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Coiled strips of woven fabric hanging on a wooden rack
Lightweight Structures

Keder and Keder Rails for Fabric Structures

Keder makes fabric installation simple. The integrated rope edge slides into an aluminum rail, creating a secure connection to the frame and working with nearly any existing structure.

Reliable Connections Between Fabric and Frame

Keder is the rope edge that connects a fabric panel to its frame. It slides into a channel in an aluminum extrusion rail. Keder has two components, a PVC extrusion core and a woven fabric jacket.

That gives the panel one continuous path to the frame. The panel edge is sewn or welded to the keder cord, the cord seats in the channel, and the keder rails (extrusions) hold the panel on the frame. Keder rails can be added to almost any existing frame without alterations or modifications.

The jacket’s fibers are exposed on the outside, so the cord slides smoothly into the rail. That makes keder easier to install than other rope edges.

Attachment styles and sizing are covered on What is keder?

Drawing of a keder edge dimensioned 40 mm from the cord, marked cut here and wedge weld

Precision-Welded Keder

Lightweight Structures distributes all keder already radio frequency (RF) welded. RF welding holds the distance between the core and the edge of the fabric consistent, and that consistency is what makes tighter clearspan panels with better wind resistance possible. A straight weld also speeds up fabrication.

How far the weld reaches matters as well. A weld that bonds the cloth to the core all the way around keeps the keder functioning under harsh conditions, even where the cloth has partially ripped.

What a Keder System Includes

The Keder Cord

The rope edge itself, in several diameters and in sewing, single flag and double flag styles. We carry two lines, EuroKeder and KederMaker.

Single flag keder is not appropriate for larger panels with high tensile loads. The welding occurs on one side only, so the weld becomes a single point of failure.

Keder Rails and Extrusions

Aluminum extrusions with a channel the keder slides into. The rails are 6061-T6 aluminum with a mill finish. Powder coating and other finishing options are available.

The catalog covers 7 mm to 13 mm and includes tensioning and terminal extrusions.

Repair and Renewal

Renew Keder replaces damaged keder on clearspan tent panels without RF welding. It arrives already welded to a strip of white opaque PVC-coated fabric, and that strip welds to the existing panel with a wedge or hot air welder, or a floor welder.

Lightweight Structures supplies the repair material and does not perform installation. The repair is made in your own shop, or by the installation partner who maintains the structure. 

Fabric building with tensioned white panels meeting at aluminum rails along the frame

The Two Keder Lines We Carry

EuroKeder is European-made and RF welded. Its yarn is approximately 2200 dtex (2000 denier), against the 1100 dtex of most other keder, and it uses a plain weave. The line runs styles most suppliers do not carry: double coated keder, sewing keder, and a range of colors.

KederMaker is the value line. It is made in Haining, China and distributed in the United States by KederMaker USA. Its welding bonds the cloth to the core all the way around, and at each production lot KederMaker tests a portion of the keder for tensile resistance. Six diameters are available.

When a project does not need EuroKeder’s heavier 2200 dtex yarn, KederMaker is the line we recommend.

EuroKeder keder cord with its fabric flag folded back from the core

Shop Standard Sizes Online

Need standard sizes fast? Shop stocked keder, keder rails, and repair fabric through our online store. For custom sizes or volume orders, our team can help.

Shop Keder
KederMaker keder panels with the welded cord edge running along the fabric

Request a Quote

Ready to get started? Send us the keder diameter, style, and length you need. Need keder rails too? Include that in your request and we’ll add them to your quote.

Request a Quote

Our Industry Insights

Double Coated Keder – IFAI
Press Room

Double Coated Keder – IFAI

IFAI's Specialty Fabrics Review on double coated keder: coated fabric wrapped around an extruded core for wear resistance and longer-lasting panels.

Welded Keder Product Resists Premature Wear
Press Room

Welded Keder Product Resists Premature Wear

InTents Magazine coverage of EuroKeder: 2200 dtex fibers and RF welding designed to resist the premature wear common to standard clearspan keder.

Radio-frequency welding machine on a fabrication bench, with work gloves resting in front of it
Blogs

Types of Industrial Fabric Welds

A practical guide to RF, hot air, hot wedge, and hot bar welding for coated industrial fabrics, including when to use each method.

Keder panels on the reskinned roof of a frame-supported practice facility
Blogs

5-Step Turnkey Reskin Overview

A five-step walkthrough of a turnkey reskin: replacing the outer fabric and inner liner of a football practice facility with keder panels.

Explore Insights

Tell Us About Your Panels

Send the rail profile you are fitting, or the keder dimensions you are replacing, and we will quote the cord and the rails together. Keder samples are free.

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Partners & Memberships

  • ESTA
  • NECPA
  • Advanced Textiles Association (ATA)
  • MATRA
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