The silver-coated nickel-filled EP79FL epoxy handles high-performance bonding, coating, and sealing applications. The two-component, electrically conductive epoxy uses silver-coated nickel as the conductive filler. The epoxy is flexible upon curing, which makes it suitable for applications involving rigorous thermal cycling and aggressive mechanical and thermal shocks. It features high T-peel strength, a one-to-one mix ratio by weight, and cures readily at room temperature or more rapidly at higher temperatures. Recommended cure is overnight at room temperature followed by a heat cure of 2-3 hr at 200ºF. It is 100% reactive, does not contain any solvents or diluents, has low shrinkage upon cure, its electrical resistance is less than 0.005 Ω-cm, and has good thermal conductivity.
The epoxy can be applied with minimal sagging or dripping, and it can be made flowable by adding 5 to 10% of an appropriate solvent (xylene, acetone, MEK, etc.) by weight. The system is conducive to thermal cycling over the temperature range of 4°K to 275°F, making it suitable for cryogenic applications. EP79FL has good chemical resistance to water, oils and fuels, and adheres to metals, composites, glass, ceramics, vulcanized rubbers, and many plastics.
Master Bond Inc., 154 Hobart St., Hackensack, NJ 07601, (201) 343-8983, www.masterbond.com
The Series CL600 and CL610 aluminum compression limiters provide “spot” reinforcement of plastic assemblies in high stress joints where two components are joined together with a bolt. The limiter absorbs the load when the bolt is tightened to its recommended value and isolates the plastic from excessive compressive loads so the joint remains intact throughout product life.
Several different standard types are available for specific application requirements and assembly methods. Advantages of aluminum over brass compression limiters includes
• Lightweight — aluminum versions are one-third the weight.
• Strength — aluminum and brass models have similar compressive strength.
• Lead-free — aluminum is lead-free. (The company says its brass version meets RoHS standards for lead content.)
Spirol International Corp., 30 Rock Ave., Danielson, CT 06239, (860) 774-8571, www.spirol.com
Adhesives developed for use in high-stress applications are covered in the “Structural Adhesives and NVH Selector Guide.” This 30-page brochure is divided into three sections: considerations for selecting a structural adhesive, chemistries and products, and a review of dispensing equipment. Included in the guide is an in-depth tutorial on adhesive-joint design for stress reduction, as well as a performance and process overview in table format of the four main structural bonding technologies: epoxies, urethanes, two-part acrylics, and two-step acrylics.
The noise, vibration, harshness (NVH) section provides an overview of adhesives for acoustic, seam sealing, and bonding applications. The information details the company’s Acoustics Lab and Engineering Services and reviews two-step acrylic adhesives for difficult or challenging applications addressing NVH issues. A two-page chart identifies dispensing applicators and nozzles specifically designed for use with structural-adhesive technologies.
Henkel Corp., Engineering Adhesives, One Henkel Way, Rocky Hill, CT 06067, (800) 562-8483, www.henkelna.com/loctitestructurals
Family of special hardened stainless fasteners now includes PEM self-clinching fasteners for use in stainless steel assemblies. The fasteners install into thin stainless-steel sheets, allowing for lighter designs by minimizing hardware parts count. A wide range of types and styles is available with some providing corrosion resistance.
The line includes panel fasteners integrating captive screws for “tool-only” access to stainless assemblies; thru-hole threaded and blind threaded standoffs for stacking or spacing components to or from stainless-steel panels; nonlocking and self-locking floating nuts to accommodate mating hole misalignment; fasteners for flush “face-on-face” sheet attachment applications that allow permanent joining of two sheets without protrusions; flush-head studs; pins; and nuts.
The fasteners, made from precipitation hardening grade stainless, 400 Series stainless, or A286 stainless steels, are designed to install in stainless sheets as thin as 0.030 in./0.8 mm.
PennEngineering, 5190 Old Easton Rd., Danboro, PA 18916, (800) 237-4736, www.pemnet.com
Low-trauma silicone adhesives from 3M protect the skin while providing good adhesion to a variety of skin types, including the fragile skin of infants and the elderly. The adhesives cause low mechanical trauma during dressing, bandage repositioning, and removal — they don’t stick to hair or attract dry or dead skin cells, and leave the skin contact area intact, lowering chances of skin stripping, tearing, and infection.
Fabrico Medical, 40 Hytec Circle, Rochester, NY 14606, (800) 351-8273, www.fabricomedical.com/applications-low-trauma.htm
EN 237.1 plastic hinges are available with five different mounting options: 2 × 2 bores for countersunk screws, 2 × 2 bores for socket-head cap screws, 2 × 2 threaded bolts, 2× bore for countersunk screws/2× threaded bolts, and 2× bore for socket head cap screws/2× threaded bolts.
The hinges are made of matte-black glass-fiber-reinforced plastic (polyamide PA),with stainless-steel hinge pins. Threaded studs are made of nickel-plated steel.
J.W. Winco, 2815 South Calhoun Rd., New Berlin, WI 53151, (800) 877-8351, www.jwwinco.com
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