Heat and Water Resistant Sealant

Heat and Water Resistant Sealant

Heat and water resistant sealant creates a permanent, waterproof seal for applications that can withstand exposure to high temperatures. It adheres to metal, glass, ceramic, plastic and most types of wood and masonry.

The carbodiimide groups stably consume water molecules and prevent them from invading the polyurethane chains. Tests with a prolonged combination of water, heat and cyclic movement show low water swelling rates and high retention of tensile strength and hardness.


Intumescent is a type of functional coating that’s used to insulate steel substrates in the event of fire. It’s used in a variety of building applications to provide passive fire protection and buy time for firefighters to subdue the flames.

Like other fireproofing materials, intumescent is sprayed or troweled onto structural steel to protect it from heat and smoke. It’s often applied as a single layer, though it can be spread to multiple layers in order to achieve the desired protection times. It’s typically applied with a high-performance topcoat to ensure that it doesn’t chip or peel.

When exposed to excessive heat, intumescent coatings expand and swell to create a layer of dry char that covers the substrate. The char acts as insulation, protecting the substrate from damage and allowing firefighters to safely access the structure. The protective char lasts for hours or even longer, allowing for critical damage control and minimizing property loss.

Unlike conventional cementitious fireproofing, intumescent coatings are able to be painted, which allows them to blend in with the rest of the structure. It’s a great choice for commercial design projects where aesthetically pleasing color is important. It can be applied in a wide range of colors and even over existing paints to provide the same protection. It also has the added benefit of strengthening some types of construction materials, such as steel, prolonging their lifespan and helping to maintain their load bearing capacity.

Smoke Seals

Smoke seals are often used in conjunction with intumescent strips and they both perform a vital role for modern passive fire protection. While intumescent strips expand when they come into contact with extreme heat, smoke seals fill gaps between a door frame and the door itself to prevent toxic smoke from passing through. These products are a crucial part of fire doors and they are also a Building Regulation requirement in some circumstances.

These products are usually made from nylon heat and water resistant sealant pile, rubber or a nylon brush strip and they look similar to a weather seal. When installed, they are placed around a door frame and the hinges. They help to block cold smoke so that it loses heat and falls towards the ground, preventing it from seeping under and around the door frame.

These products are a water thin liquid that can be applied by brush, roller or spray to a wooden door frame or other wood heat and water resistant sealant substrate. They are low odor, nontoxic and contain no halogens. They are also low VOC and have been formulated to meet a stringent toxicity and environmental standard. For maximum performance, it is recommended that both products are stirred before application to ensure a consistent blend of the intumescent coating and penetrant additives. If a surface has been previously treated with another type of fire protection, it is recommended that a test area be tested first to determine if the coating will provide adequate protection.

Fire Doors

Fires can be devastating and a significant threat to residential, commercial and industrial properties. Fire rated doors offer an effective barrier to reduce or halt the spread of flames, toxic smoke and poisonous gases. They are also required by law in certain circumstances and can be a life-saving investment to protect assets, equipment, employees and customers.

Unlike standard doors, fire doors must be tested to comply with stringent safety standards. They need to withstand extreme heat for a long period of time and pass a hose stream test. They must also limit the transfer of heat from one side to another. They can be made from a variety of materials, depending on the requirements and design specifications. Steel is commonly used, but other options are available. Glass can also be utilized, with wire glass being the most common option. Borosilicate glass is one of the newest options and offers superior strength while still being transparent.

The intumescent seals in fire doors are critical to their performance and are a vital component to their fire rating. They contain sodium silicate liquid which expands when heated, forming a barrier to deprive the fire of oxygen and prevents it from spreading between rooms. The seals can be surface mounted or rebated into the door and frame. They should be regularly inspected to ensure the gaps are consistently less than 4mm, and that they are not bowed or cupped.

Marine Applications

Marine environments are extremely corrosive and demand tough, long-lasting components. Thermoset composites are ideal for gratings, ductings, shafts, and piping. They are also perfect for retaining and locking threaded assemblies and resisting loosening under vibration.

Modern marine sealants have come a long way from the natural pine resins that were used in earlier days, with newer formulations being fast-curing and highly durable. For example, polyurethanes have the tensile strength needed for structural bonding and can resist impact shock. They also have great flexibility, making them ideal for deck-to-hull and wood-to-wood applications. They are especially useful for forming a tight seal on windows. They are resistant to mold, mildew, UV, oil and cleaning solvents, heat, and weathering.

Electronics are a significant risk factor in the marine environment and need to be protected against water damage and vibration. This can be accomplished by potting or encapsulating the device with an epoxy compound.

HPS has extensive experience supplying marine duty products for applications that require ABS, MIL specifications, DNV, Bureau Veritas, or Lloyd’s of London approvals. These applications range from fishing fleet vessels and petroleum production platforms to the world’s largest freight and passenger ships. These projects operate 24 hours a day, 365 days a year and endure rough seas and wind-swept decks. Providing the right materials that can handle these harsh environments is an ongoing challenge and one that we strive to meet.