Adhesives
Accelerator - A fluid used to speed up material curing.
Activator - A
fluid used to cure an adhesive or clean a component prior to the
adhesive being applied. Sometimes associated with Cyanoacrylates in
brush or spray format. Also used as the second part of a two-part
adhesive.
Acrylic - A structural adhesive capable of bonding a broad range of substrates including most types of plastics and metals both minimally prepared and unprepared. Two-part catalyst cure or one part UV or heat cure available. Good to excellent flexibility and environmental resistance. Fast setting times.
Alloy - A combined substance of two or more metals or a metal and non-metal that fuse together and dissolve in each other when molten.
Anaerobic - A one-part adhesive/sealant that cures only in the absence of air. Designed for locking screws, nuts, bolts and/or retaining bearings, shafts, etc. A single part adhesive.
Aqueous - Meaning water based fluid or containing water. For example, PVA, papert or wood glues.
Balling - A solder paste term. A separation effect when the liquid carrier is forced out of the solids.
Braze Paste - A paste or flux material. For alloys that melt above 425 deg c.
Caulk - A sealant or silicone used to fill gaps as well as describing the process of gap filling.
Cement - Usually a solvent based fluid for plastic bonding. Melts the plastics to fuse and create an invisible join.
Centipoise - Normally written as cps, this is a way of measuring the viscosity (thickness) of a product. The higher the number, the thicker the fluid. 100cps = 1 POISE.
Conductive Epoxy - A term used with fluids that will conduct electricity. These materials often come pre-packed in dispensing barrels or cartridges.
Contact Adhesive - Solvent based single part adhesives. Typically higher viscosity, stringy adhesives. Typical application is to apply to both surfaces of a part to be joined,left to air for a period and then pressed together to fix. High levels of fumes with these materials.
Contact Adhesive - Solvent
based single part adhesives. Typically higher viscosity, stringy
adhesives. Typical application is to apply to both surfaces of a part to
be joined,left to air for a period and then pressed together to fix.
High levels of fumes with these materials.
Contact Adhesive - Solvent
based single part adhesives. Typically higher viscosity, stringy
adhesives. Typical application is to apply to both surfaces of a part to
be joined,left to air for a period and then pressed together to fix.
High levels of fumes with these materials.
Cure Time - The time taken to alter the physical properties from a liquid to a solid state. For two-part materials, this cure time to solid starts when thorough mixing takes place.
Cyanoacrylate - A one-part adhesive that cures instantly on contact with mated surfaces. High strength, excellent adhesion to a wide variety of substrates. Cyanoacrylates are available in a variety of viscosities, cure speeds, gap-filling capability and surface compatibility. Ideal for bonding rubbers and plastics.
Dilatent - A liquid where viscosity (thickness) increases with shearing rate (when you stir it). Dilatent is the opposite of Thixatropic.
Epoxy - Available in two-part or one-part, both room temperature and heat curable formulations, epoxy adhesives provide high strength bonds on a wide variety of substrates. The bond can often times be stronger than the parts being bonded. Epoxies are very tough with good chemical and environmental resistance. Epoxies come in variable cure speeds and have good void filling capabilities. They are also available with electrically and thermally conductive properties.
Hot Melt - A thermoplastic material that is melted in dispensing equipment and is applied in a molten state. It then wets the substrate surface and as it cools, it solidifies forming a bond. Very fast setting. Not a true structural but has the capability to bond a broad range of substrates.
Polyurethane - One or two-part urethane adhesives provide superior bonds with minimal surface preparation for today's high performance thermo sets and thermoplastics. They provide excellent flexibility and durability. Polyurethanes cure via a catalyst, heat or air evaporation. Generally slower to cure with more challenging handling or curing properties.
Silicone - One-component adhesive/sealant that cures to a tough rubbery solid upon exposure to moisture in the air. Silicone has good resistance to weathering, vibration, moisture and chemicals. Silicone works in a temperature range from -76F to 600F.
Solvent Based - One-part solvent evaporation system with a rubber or plastic base. Contact cement, dip coatings, rubber bonding. Good product for laminating or for covering a large surface area economically.
UV Cure - Ultraviolet (UV) and visible light curing adhesives are used for bonding, coating, encapsulating, tacking and sealing. These single component, solvent free products cure in seconds when exposed to industrial UV/visible light sources. Some of these adhesives will cure with the light source, an activator or both.
Water Based - One-part water evaporation system with medium set time. Water based adhesives can be used in a wide variety of non-structural bonding applications. Excellent for paper, cardboard, wood, etc.
Conformal Coatings
Acrylic - Acrylic conformal coatings are easy to apply. They dry to the touch at room temperature in minutes, have good electrical and physical properties, and are fungus resistant. Acrylic conformal coatings have low or no exothermal during cure, which prevents damage to heat-sensitive components, and are easy to repair.
Polyurethane - Polyurethane conformal coatings provide excellent humidity and chemical resistance plus very good electrical properties for extended periods of time. Most single-component polyurethane conformal coatings require careful application procedures and close control of coating and curing environments. Polyurethane conformal coatings can be burned through with a soldering iron making component replacement fairly easy.
Silicone - Silicone conformal coatings offer the highest flexibility, high moisture and fungus resistance, chemical resistance and excellent repair characteristics. Silicone conformal coatings offer excellent electrical properties and the thermal properties available. Silicone conformal coatings are available as 100% solids - heat-curing liquids, 100% solids - moisture curing liquids and a solvent borne moisture-curing material.
UV Curable - Many of the above chemistries are available in a U.V. curable version which are solvent free products that cure in seconds when exposed to industrial U.V./visible light sources. Besides Acrylics, Polyurethanes, and Silicones, there are epoxy and acrylated-urethane U.V. conformal coatings available.
Potting - Encapsulating
Epoxy - Epoxy potting compounds are available in one or two-component formulas. They offer the widest range of handling and cured properties along with a wide range of viscosities. Epoxies provided excellent adhesion to most surfaces plus excellent resistance to most environments and chemicals. Epoxy potting compounds provide very good electrical properties with minimal or no volatiles during curing.
Silicone - Silicone potting compounds are available in 100% solid one and two-component materials with "user-friendly" mix properties. Silicone potting compounds are high in purity, low in toxicity, with outstanding weather resistance. The silicone materials function from -100F to 600F and provide the best thermal cycle capabilities available.
Polyurethane - Polyurethane potting compounds are available in one and two-component formulas. They offer excellent adhesion to most materials along with excellent abrasion resistance. Polyurethanes have good electrical properties along with high impact strength. Excellent low temperature flexibility is provided with an upper service temperature limit of 250F.
UV Curable - U.V. Curable potting compounds are available in both one and two-component formulations. These 100% solid materials usually cure within 10-20 seconds when exposed to U.V. or visible light sources. U.V. curable potting compounds provide rapid cure cycles, increased through put and are available in various chemistries.
Sealants
Acrylic - Acrylic sealants exhibit good adhesion to most surfaces and remains ductile in the presence of ultraviolet exposure and other weather conditions. Acrylic Sealants are excellent general-purpose materials which are used in many outdoor applications. After cure they can be painted.
Polysulfide - Polysulfide sealants are 100% solid materials available as one or two-part formulations. Polysulfides are very durable used primarily for the aerospace and window industries. These products have excellent resistance to all types of fuels.
Polyurethane - Polyurethane sealants are mostly one-part materials that show excellent adhesion and elongation. Polyurethane's are non-corrosive, paintable and very flexible. Polyurethane's will adhere to most substrates, perform well under a wide temperature range and exhibit resistance to many chemicals and weathering.
Silicone - Silicone is the multi-purpose sealant that has the largest operating temperature range (-76F to 600F). One-component silicone sealants cure to a touch rubbery solid when exposed to moisture in the air. Silicone sealants are excellent general-purpose sealants that have good resistance to weathering, vibration, moisture and ozone. Silicone sealants are generally easy to extrude and handle.
Dispensers
Air Powered - Pneumatic operated fluid dispenser. Requires a compressed air or nitrogen supply of around 70 to 100psi. The dispenser regulates the air supply to a level suitable for the fluid and delivers either repeat, timed pulses or operator controlled beads using a foot switch or fine switch.
Analog - Older style dispensers with a simple analog timer and gauge. Not digital. Automatic Dispenser - Dispensers that feature an adjustable timer. Once set, the dispenser will provide a repeat deposit. Eliminates the need for operators guessing the shot size.
Positive Displacement - Dispensers or valves that deliver volumetric deposits of paste instead of time/ pressure. Material is fed to a chamber or auger that dispenses a fixed quantity. Most accurate method of dispensing. Materials are not affected by changes in temperature, viscosity or curing.
Time/ Pressure - Dispensers that use an adjustable timer to set the deposit size and air pressure to force out the material. Simple method of delivering controlled deposits of liquids and pastes.
Timer - Dispensers that feature an adjustable timer. Used to make repeat deposits. Timers can be analog or digital.
Vacuum Suck-back - Dispensers that feature an adjustable air vacuum. This is used to pull air back against the syringe barrel to prevent drips.
Components
Barrel - A plastic reservoir used for fluid dispensing. From 1cc to 60cc. Uses a plastic or rubber piston to push material out. Rubber pistons are usually referred to as stoppers.
Cartridge - A
plastic reservoir used for fluid dispensing. From 1oz (30cc) to 32oz (960cc). Uses a
plastic plunger to push material out.
CC - Syringes, barrels and cartridges are all indicated by cc size. Measure of volume. Cubic centimetres. Equivalent to ml (millilitres). 1000cc or ml is 1 litre.
C.F.M.
- Cubic Feet per Minute. A measure of free air consumption used by a pneumatically powered device such as a dispenser or applicator gun. For example, a TS250, ADL810 or 1000T dispenser is likely to consume less than 2 CFM.
Dual Cartridge - A side by side cartridge for two-component epoxies, resins, PUs and other materials. Fixed ratios of 1:1, 2:1, 4:1 and 10:1. Sizes 50ml to 1500ml.
Gauge Size - Standard indication of needle tip hole size. The higher the number, the smaller the inner diameter. For example, 14 gauge is usually 1.6mm ID, 34 gauge is 0.08mm ID.
Industrial Grade Safe - Plastic and metal components that are certified for industrial use. Safe products tested and approved to be used at high pressures (usually up to 100psi).
Luer Lock - Standard syringe barrel and needle tip connection style. Tips or fittings are twisted on or twisted off for a secure, leak free connection.
Luer Slip - Push-on needle tip attachment usually found with manual graduated syringes. Less secure than lure-lock and not always suitable for air-powered dispenser.
Semkit
- A plastic cartridge with internal mixer head and rod for
two-component material mixing and dispensing. Uses 2.5oz (60cc) to 20oz
(600cc) cartridges. Injector style for mix rations above 10:1. Barrier
style for mix ratios under 10:1. Used with standard dispensing guns.
Silicone Free - Plastic components such as barrels, cartridges and tips that are moulded without silicone release agents. Certified products that ensure specialty epoxies and adhesives that are dispensed are not affected by silicone in the plastics. Silicone oils can affect some adhesives curing correctly or performing.
Stopper
- Rubber piston used with syringe barrels. Either manual (attaches to a plunger rod) or pneumatic type stoppers in sizes 1cc to 100cc.
Techkit - A plastic cartridge with internal mixer head and rod for two-component material mixing and dispensing. Uses 2.5oz (60cc) to 20oz (600cc) cartridges. Injector style for mix rations above 10:1. Barrier style for mix ratios under 10:1. Used with standard dispensing guns.
UV Block - Usually refers to syringe barrel colour and type. A UV block syringe will be opaque black to ensure light does not affect the light sensitive adhesive inside.
UV Filter - Usually refers to syringe barrel colour and type. A UV filter syringe will be light or dark amber, blue or green, to ensure light does not affect UV cure adhesives inside.
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