1. Uniform distribution of stress over the entire bonded area can eliminate stress concentration caused by rivets, spot welds, and similar mechanical fastening. Lighter, thinner materials can often be used without sacrificing strength.
2. Bonding laminates of dissimilar materials can produce combinations superior in strength and performance to either adherent alone. Adhesive flexibility compensates for differences in coefficients of expansion.
3. Elastomeric flexibility improves resistance to vibration fatigue.
4. Holes are eliminated maintaining the integrity of the bonded material. This can reduce finishing and increase design flexibility.
5. Continuous contact between mating surfaces can effectively bond and seal against many environmental conditions.
6. Costs can be lowered by reducing material requirements and weight; eliminating drilling, welding, screwing, and similar operations.
Choice of 3M structural or non-structural formulations.
To meet requirements for stress resistance, specific substrates, application efficiency and cost, 3M offers a wide range of easyto- use adhesives in handy sizes with practical dispensing systems. Structural adhesives (pages 5 to 15) bond the load-bearing parts of a product. Usually these are metal, but wood, glass and rigid plastics can also be structurally bonded. Non-structural adhesives (pages 16 to 33) bond materials for insulation, cushioning and paneling, rubber, plastic, fabric, leather, wood, cardboard, and other substrates used in non load-bearing applications.
3M high-strength structural adhesives are fundamentally load-bearing formulations. Bond strength is often as strong as, or stronger than the materials joined. These adhesives are generally cross-linked or thermosetting, and include epoxies, phenolics, urethanes, acrylics, and cyanoacrylates.
The aircraft industry is one of the pioneers in use of structural adhesives. And structural adhesives still play an integral role in the aerospace industry. Many other industries have also been taking advantage of 3M’s advanced formulations and innovative dispensing.
For example, structural adhesives are used in bushing assembly in appliances, headlight assembly in cars, fiberglass decks in boats, relays and controls in electronic equipment, lawn sprinklers, window frames, office partitions, pump casting components, golf clubs, home furniture, and surgical instruments.
The 3M structural adhesives product line includes the following:
• 3M™ Scotch-Weld™ Structural Adhesives
• 3M™ Scotch-Weld™ Electronic Grade Epoxy Adhesives
• 3M™ Scotch-Weld™ Film Adhesives
• 3M™ Pronto™ Instant Adhesives
• 3M™ Jet-Weld™ Thermoset Adhesive System.