Fast-curing adhesives — Two new fast-curing adhesives, the light and heat-curing Delo-Katiobond OB and Delo-Dualbond OB, meet the requirements of the optoelectronics industry. Features include low outgassing, optical stability, and rapid adhesion.
The OB adhesives remain optically stable even during thermal aging; get less yellowy than other UV or heat-curing materials; and they bond extremely fast.
DELO Industrial Adhesives LLC, 144 North Rd., Suite 2650, Sudbury, MA 01776, (978) 254-5275, Visit www. delo-adhesives.com/us
Self-locking, vibration-resistant nuts — Hardlock Nuts, designed to resist loosening from vibration, are now available in inch sizes. The nuts come in UNC threads with sizes ranging from 1/4 to 1 in. (in 1/16-in. increments).
To prevent the self-locking nuts from loosening, a centered concave top nut and off-centered (eccentric) convex lower nut combine to form a wedge when tightened. This applies force perpendicular to the bolt. When the top and bottom nuts are tightened, the self-locking force of the wedge prevents loosening, even when subjected to repeated vibrations and shock.
HARDLOCK Industry Co. Ltd., 1590 Touhy Ave., Elk Grove Village IL 60007, (847) 593-7000, Visit www.hardlocknut.com
Optically clear adhesives — Loctite liquid optically clear adhesives (LOCA) increase display durability, improve contrast ratio, reduce power consumption, and allow thinner device designs. These adhesives for direct bonding and cover lens bonding simplify display assembly. The advanced cleaners reduce overall manufacturing cost.
The ultrasoft LOCAs for direct bonding reduce the potential for Mura, while filling gaps from 200 to 300 μm. Loctite 3191, 3198, and 3199 are low-durometer, low-modulus, and low-shrinkage materials that deliver high-tensile and adhesion strength on polarizer films, PMMA, and glass and ITO-coated glass to prevent delamination during RA testing.
For glass-to-glass or plastic-to-glass cover-lens bonding, Loctite 3193HS and 3194 withstand stresses created by the substrates’ differing coefficients of thermal expansion. These fast-flowing, low-viscosity materials cure with light in seconds when filling gaps from 100 to 200 μm and achieve up to 7 MPa cross tensile strength. For use on glass, PMMA, ITO-coated glass, and ITO-coated PET films, these adhesives have a lower cycle time in the manufacturing process and are more resistant to delamination.
Henkel Corp., Engineering Adhesives, One Henkel Way, Rocky Hill, CT 06067, (800) 562-8483, Visit www. henkelna.com/loca
Quartz-filled two-component epoxy — Thermally stable Supreme 45HTQ is a two-component quartz-filled epoxy with exceptional abrasion and chemical resistance. It withstands exposure to petrochemicals, acids, bases, and solvents and retains its performance profile at temperatures up to 450°F.
The epoxy has a 100-to-30 mix ratio by weight and offers a 12‑hr+ working life at room temperature. Additional features include good flow properties, easy to apply for bonding and sealing applications, and can be cast in sections many inches in depth.
This high-strength system bonds well to metals, composites, ceramics, and many rubbers and plastics. It has a tensile strength over 10,000 psi and a compressive strength greater than 20,000 psi at room temperature. Dimensionally stable, it requires oven curing at 250 to 350°F and offers low shrinkage upon curing. As a toughened compound, Supreme 45HTQ resists rigorous thermal cycling.
Master Bond, 154 Hobart St., Hackensack, NJ 07601, (201) 343-8983, Visit www.masterbond.com/properties/chemical-resistance
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