United Airlines Bonds Torlon Inserts in Aircraft Floor Panels With Polyurethane Adhesive

September 1, 2002
/ Print / Reprints /
ShareMore
/ Text Size+
Vantico’s Uralane 5774-A/B polyurethane, supplied in Accumix dual cartridges, is easy to apply around pre-drilled holes in a floor panel.
To reduce weight and increase the corrosion resistance of floor boards installed on its fleet of Boeing aircraft, United Airlines recently replaced metal-panel inserts with advanced Torlon(r)* polyamide-imide inserts. The flanged inserts that are used to secure floorboards in both passenger and cargo compartments are bonded in place in epoxy/fiberglass skin/Nomex(r)* honeycomb-core panels using a flexible polyurethane adhesive rather than the epoxy that is typically used for insert potting. United Airlines switched to the Uralane(r) 5774-A/B polyurethane, supplied by the Adhesives & Tooling Division of Vantico Inc., Los Angeles, after pull tests confirmed that the adhesive produced higher bond performance than epoxy on Torlon/honeycomb-panel reinforcement.

According to Rudy Sylvester, staff specialist engineer, Component Engineering -- Interiors at United’s San Francisco maintenance facility, “Our tests indicated that the Uralane polyurethane performed better than epoxy in both bolt pull-out strength and lap shear.” Uralane 5774-A/B is a tough, impact-resistant, semi-paste adhesive that is formulated for bonding engineering thermoplastics.

The bottom section of the flanged Torlon insert is placed into the adhesive-coated hole.

Dissimilar Substrates Prompt Change

United had historically installed metal inserts into aluminum/balsa-wood floorboards using Vantico self-extinguishing epoxy insert-potting compounds, including Epocast(r) 1618-A/B syntactic epoxy and Epibond(r) 1559-A/B fast-setting epoxy. When Boeing switched to epoxy/fiberglass honeycomb panels reinforced with Torlon inserts, the epoxy adhesives did not provide the needed bond strength between the dissimilar substrates. The airline then began investigating different adhesives for the project, including Vantico’s Uralane 5774-A/B polyurethane that is qualified to a BMS 5-105, Type 5 specification. It has a 1,525-minute work life, a room-temperature lap-shear strength of 2,000 psi on aluminum/aluminum bonds and a T-peel of 40 pli. The polyurethane provided the bond performance required to securely install the Torlon inserts in the composite floor panels.

Insert Potting

United technicians begin by installing an Accumix(tm) dual-barrel cartridge of Uralane 5774-A/B polyurethane into a dispensing gun along with a static-mixing nozzle. They then pull the trigger to mix resin and hardener components in the nozzle and dispense the fully blended polyurethane around the edges of a pre-drilled hole. Finally, the bottom half of the flanged insert is installed in the hole and allowed to cure at room temperature for six hours. Technicians then move to the next hole and follow the same procedure until each panel is completely reinforced.

“The polyurethane flows neatly and easily from the dispensing cartridge, forming a smooth bead around the holes in the panel,” Sylvester explains. “It provides us with the dependable performance we need,” he concludes.

*Torlon is a registered trademark of Quadrant Engineering Plastic Products. Nomex is a registered trademark of DuPont.

For more information on Uralane 5774-A/B polyurethane adhesive and the Accumix(tm) dual-barrel cartridge, contact Vantico Inc., 5121 San Fernando Road West, Los Angeles, CA 90039; call 818-247-6210; fax 818-507-0167; e-mail info@vantico.com; or visit the Web site www.vantico.com. Or Circle No. 205.

Links

Did you enjoy this article? Click here to subscribe to Adhesives & Sealants Industry Magazine.

You must login or register in order to post a comment.

Multimedia

Videos

Image Galleries

In-Depth Features

These articles detail advantages and innovations for multiple end uses.

Podcasts

ExxonMobil Tackifier Expansion

Dwight Tozer, vice president of ExxonMobil’s Adhesion Industry business, discusses the company’s latest tackifier expansion project with Editor-in-Chief Susan Sutton.

More Podcasts

THE MAGAZINE

Adhesives & Sealants Industry Magazine

ASI April 2014 cover

2014 April

Our April issue focuses on pressure-sensitive adhesives, including a preview of PSTC's 2014 Tape Summit, as well as converting/packaging and composites!

Table Of Contents Subscribe

THE ADHESIVES STORE

handbook-sealant-tech.gif
Handbook of Sealant Technology

The Handbook of Sealant Technology provides an in-depth examination of sealants, reviewing their historical developments and fundamentals, adhesion theories and properties, and today’s wide range of applications.

More Products

asi1211p_Cover-DE.gifASI's Buyers' Guide

Annual purchasing resource for equipment used in the manufacture/formulation of adhesives, sealants, pressure sensitives, tapes and labels and for application of finished adhesives. 

Clear Seas Research

With access to over one million professionals and more than 60 industry-specific publications, Clear Seas Research offers relevant insights from those who know your industry best. Let us customize a market research solution that exceeds your marketing goals.

STAY CONNECTED

facebook_40px twitter_40  youtube_40pxlinkedin_40