A component is potted with clear epoxy to see if the bar code can be read through the sealant.

A clear epoxy sealant is used to pot this component as part of a test to see how well a bar code can be read through the protecting layer.

Sealants are barriers used to complete an enclosure and protect against the contamination of that enclosure or escape of materials from it. These barriers come in many forms and can be hard or soft and a variety of different materials including foam, rubber, or chemical pastes. Hernon sealants are chemical compounds; formulas that produce material buffers with commonly desired properties such as resistance to other chemicals, tolerance of thermal cycling, and adhesion to treated surfaces.

Hernon sealants come in several groups:

Tuffbond® (Epoxies) as Sealants

Epoxies are commonplace, found in kits for bonding, and they are the preferred sealant material for encapsulation or potting processes. Encapsulation is the process of coating a component in material to seal and protect the component. Sometimes this can help protect the component from water or chemical exposure and sometimes it will protect against physical shock or provide a deterrent against tampering or viewing proprietary information. Another form sealing with epoxies is potting. Potting uses material (typically epoxy) to fill a void often covering sensitive components. See the image top for an example of potting using clear epoxy.

A component is potted with clear epoxy to see if the bar code can be read through the sealant.

UV FOG (Ultraviolet Form-on-Gasket)

Hernon’s UV curable resin forms a soft, flexible gasket in any size or shape. Entire gasket and O-Ring inventories can now be replaced with one simple bottle. The resin cures within seconds of exposure to UV light and has excellent adhesion to metals, glass, ceramics, and plastics. Water and chemical resistant formulas are available. Common uses include engine covers, oil pans, and other Fluid Seal Systems, Etc.

Dripstop®, Powerseal® & SelfSealer® (Thread Sealant)

Thread sealants are used to fill gaps between threads in threaded assemblies such as nuts and bolts. Absolutely essential in pressurized fluid and gas systems, thread sealants are rated to different pressures from low-pressure instant sealing products to high-pressure materials where even the smallest leaks can produce a significant problem. Thread sealants typically cure anaerobically which means in the absence of oxygen. It is recommended that thread sealants are dispensed onto the first few threads on a fitting. As bolts are assembled in place, the thread sealant is squeezed throughout the gaps in the assembly. Once the oxygen is excluded the thread sealant will harden and adhere to the threads to resist loosening of the assembly. Some thread sealants never cure and remain soft and pliable indefinitely. Hernon thread sealants include the Dripstop®, Powerseal®, and SelfSealer® families.

Gasket Replacer® (Anaerobic Gasketing Compound)

Gasketing compounds are similar to the UV FOG mentioned above but tend to be much higher viscosity when applied. These typically appear like a gel or paste and form and hold clear beads. This is by design to allow the user plenty of time to outline a flange before mating the parts. Hernon’s Gasketing Compounds include the Silastomer® family and the Gasket Replacer® family. As the name Gasket Replacer® implies these products are often used to replace relatively expensive rubber or cork gaskets. The custom nature of applying these gasket sealants in whatever pattern necessary makes them ideal for prototyping projects and custom work where the cost and time to have a mold created to produce rubber gaskets is impractical.

Silastomer® (Silicone Adhesives)

Silastomer® is a line of flange gasket and sealing silicones. Silastomer® products offer excellent moisture resistance and large gap filling abilities. Various Silastomer® formulas include an acetoxy cure for general-purpose usage and/or oxime cure for electrical and electronic components. Common uses include waterproofing electronics, engine components, versatile electrical insulation, Etc.

HPS® (Hernon Porosity Sealing)

Hernon® Porosity Sealants (HPS) are impregnation resins designed to improve component density, machinability, and surface quality for painting, plating, and improved leak resistance. Microscopic voids in parts are filled by the low viscosity resin and sealed permanently. The parts leave the impregnating process without surface residue and can be used immediately in production. Hernon® Porosity Sealants offer superior stability and predictability during the impregnation process when compared to older sealing materials like sodium silicate. Full and complete sealing without any limitations is the norm. Common uses include engine blocks, wire harnesses, castings, water and fuel pumps, carburetors, brake parts, powdered metal gun parts, valves, manifolds, plastic molds, regulators, compressor parts, Etc.

Ammunition Sealants

With nearly four decades of experience in developing high-performance sealants for all sizes and types of ordnance including handgun and rifle cartridges, blank ammunition, shotgun shells, grenades, and even mortar rounds and missiles – Hernon Manufacturing is widely regarded as the World Leader in Ammunition Sealant Technology. Hernon’s ammunition sealants are 100% solid systems with no solvents and exceed US Army, US Navy, and NATO leak tests just minutes after application. Hernon® also offers numerous State-of-the-Art UV LED curing components and customized dispensing and sealing solutions which results in a single source, Total Solution for most of the world’s leading ammunition manufacturers. Ask about our new crimp augmentation capabilities! Hernon ammunition sealants are useful for waterproofing virtually all munitions. Additional information on ammunition sealing can be found at Hernon’s micro-site devoted to the subject:

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