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LORD® 7542 adhesive is an equal-mix, two-component urethane adhesive system used to bond FRP, SMC and other plastics with little surface preparation. This adhesive will also bond primed metals. LORD® 7542 adhesive system is available in a range of working times to accommodate a wide variety of process requirements.
Unit of Measure

Specifications

Thickness

 N/A 10 to 40 mil254 to 1016 c

Shelf Life

 N/A 6 months

Color

 N/A Tan

Typical Properties

Appearance

 N/A Liquid

Viscosity at 77 Degree Fahrenheit (ºF) (25 Degree Celsius (ºC)) Temperature

 N/A 4000 to 14000 cP

Density

 N/A 10.3 to 10.6 lb/gal1234 to 1270 kg/m³

Flash Point (Closed Cup) Temperature

 N/A >200 ºF>93 ºC

Note for Typical Properties

 N/A Data is typical and not to be used for specification purposes.

Typical Properties of Resin Mixed with Curative

Mix Ratio by Volume, Resin to Curative

 N/A 1:1

Solids Content by Weight

 N/A 100 %

Working Time at 75 Degree Fahrenheit (ºF) (24 Degree Celsius (ºC)) Temperature

 N/A 11 to 15 minutes

Time to Handling Strength at 75 Degree Fahrenheit (ºF) (24 Degree Celsius (ºC)) Temperature

 N/A 2 hour

Note for Typical Properties of Resin Mixed with Curative

 N/A Data is typical and not to be used for specification purposes.

Shelf Life/Storage

Shelf Life/Storage/Shipping

 N/A Shelf life is six months when stored in a clean, dry environment at 65-85 ºF (18-30 ºC) in original, unopened container. Excluding LORD® 7542-B Black and 7542-C curatives, prolonged exposure to temperatures below 50 ºF(10 ºC) during shipping or storage may cause variations in cured properties and/or significant reduction in shelf life.

After opening, protect adhesive from excessive exposure to moisture by installing desiccant cartridges and/or using dry nitrogen as an inert cover.

Features

Non-Flammable

 N/A Does not require explosion-proof equipment.

Environmentally Recommended

 N/A Does not contain ozone depleting chemicals.

Environmentally Resistant

 N/A Resists sunlight, weathering, humidity and salt spray.

Chemically Resistant

 N/A Solvent resistant when cured. Painting and most cleaning processes do not affect bond strength.

Underwriters Laboratories (UL) Rated

 N/A Underwriters Laboratories (UL) 746C certified.

Applications

Surface Preparation

 N/A Surfaces should be free of grease, dirt and other contaminants. For plastics, clean the surface with a dry rag wipe or a rag dampened with solvent. For metals, prime or grit blast the surface, then solvent wash for optimum bond performance.

Mixing

 N/A Mix LORD® 7542-A resin with the appropriate curative at a 1:1 ratio, by volume. Handheld cartridges will automatically dispense the correct volumeric ratio of each component. Once mixed, the adhesive cures rapidly.

Applying

 N/A Apply adhesive using handheld cartridges or automatic meter/mix/dispense equipment.
  • Handheld Cartridges
  1. Load the cartridge into the applicator gun and remove the end caps.
  2. Level the plungers by expelling a small amount of adhesive to ensure both sides are level.
  3. Attach mixing tip and expel a mixer’s length of adhesive.
  4. Apply adhesive to substrate and mate the parts within the working time of the adhesive. Clamp in position until adhesive reaches handling strength.
    • Meter/Mix/Dispense Equipment
    • Contact your LORD® representative if assistance is needed using this equipment.

      For optimum adhesion, bondline thickness of LORD® 7542 adhesive should be 10-40 mil (254-1016 micron). During use, limit the exposure of LORD® 7542 adhesive containers to cold temperatures

Curing

 N/A LORD® 7542 adhesive will cure to full strength in 24 hours or less at 75 ºF (24 ºC), depending on the curative used.

Cleanup

 N/A Clean equipment and tools prior to the adhesive cure with organic solvents such as isopropyl alcohol. Once adhesive is cured, heat the adhesive to 300 ºF (149 ºC) or above to soften the adhesive. This allows the parts to be separated and the adhesive to be more easily removed. Some success may be achieved with commercial adhesive strippers.

Additional Information

Additional Information

 N/A Values stated in this technical data sheet represent typical values as not all tests are run on each lot of material produced.

Information provided herein is based upon tests believed to be reliable. In as much as LORD® Corporation has no control over the manner in which others may use this information, it does not guarantee the results to be obtained. In addition, LORD® Corporation does not guarantee the performance of the product or the results obtained from the use of the product or this information where the product has been repackaged by any third party, including but not limited to any product end-user. Nor does the company make any express or implied warranty of merchantability or fitness for a particular purpose concerning the effects or results of such use.

LORD® and "Ask Us How™" are trademarks of LORD® Corporation or one of its subsidiaries.

LORD® provides valuable expertise in adhesives and coatings, vibration and motion control, and magnetically responsive technologies. Our people work in collaboration with our customers to help them increase the value of their products. Innovative and responsive in an ever-changing marketplace, we are focused on providing solutions for our customers worldwide. Ask Us How™.