Momentive RTV118 Flowable Silicone Adhesive Sealant is a one-component, ready-to-use RTV silicone developed for bonding, sealing, coating, insulating, and protecting components that require a low-viscosity material capable of flowing into narrow gaps. Its translucent appearance, self-leveling consistency, and room-temperature moisture cure make it a practical choice for electronics, electrical equipment, appliances, lighting assemblies, industrial instruments, and general maintenance. After curing, the material forms a tough, flexible silicone rubber that helps assemblies withstand temperature changes, vibration, moisture, weathering, and everyday mechanical stress.

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Momentive RTV118 Flowable Silicone Adhesive Sealant for Precision Sealing

Unlike paste-grade silicone products that remain where they are dispensed, RTV118 is designed to flow into small crevices and hard-to-reach areas. This feature is especially useful when sealing around wires, terminals, connectors, heating elements, sensor housings, lamp assemblies, and closely spaced components. The liquid consistency can improve surface coverage and help reduce unsealed channels when the product is applied in a controlled quantity.

The adhesive sealant cures after exposure to atmospheric moisture at room temperature, eliminating the need for heat-curing equipment in many applications. During cure, the product develops a durable elastomeric layer that remains flexible rather than becoming rigid or brittle. This flexibility helps absorb movement between materials with different thermal expansion rates and supports reliable sealing in assemblies exposed to repeated heating and cooling.

Momentive RTV118 Flowable Silicone Adhesive Sealant Key Advantages

Momentive RTV118 Flowable Silicone Adhesive Sealant offers a useful combination of flowability, adhesion, temperature resistance, electrical insulation, and environmental protection. Momentive identifies RTV118 as a temperature-resistant, flowable sealant within its RTV 100 Series and lists it as a self-leveling grade designed to reach small crevices. The product also meets MIL-A-46106B requirements, making it suitable for buyers who need an established industrial silicone with recognized performance credentials.

Typical applications include sealing electrical boxes, insulating terminals, protecting wire connections, bonding selected metals, plastics, ceramics, and glass, forming flexible gaskets, and coating components that need moisture or weather protection. It can also be used for potting shallow sections, sealing heating elements, and filling small gaps where a paste adhesive may not spread effectively. Because adhesion performance varies by substrate and surface condition, testing is recommended before production use, particularly on low-surface-energy plastics or coated materials.

For manufacturers, the one-part format simplifies inventory and reduces the risk of incorrect mixing ratios. Operators can dispense directly from the package, position the assembly, and allow the material to cure under normal ambient conditions. This supports manual assembly, repair work, prototyping, and repeat production where clean application and consistent flow are important.

How to Apply Momentive RTV118 Flowable Silicone Adhesive Sealant

Clean all surfaces thoroughly before application. Remove dust, oil, grease, moisture, release agents, corrosion, and loose residues that may interfere with bonding. Apply a controlled bead or deposit to the required area, allowing the material to flow naturally into the joint or crevice. Avoid excessive application around moving parts, optical surfaces, or electrical contacts that must remain exposed.

Assemble the parts while the material is still workable and leave the bonded area undisturbed during the initial cure. Cure speed depends on temperature, humidity, joint depth, and the amount of sealant applied. Because RTV118 uses an acetoxy cure system, acetic acid vapor is released during curing. Adequate ventilation is required, and compatibility should be confirmed when working with sensitive metals, electronics, or coatings.

Momentive RTV118 Flowable Silicone Adhesive Sealant is an excellent purchasing option for customers who need a dependable liquid RTV silicone for precision sealing and industrial protection. Its self-leveling flow, room-temperature cure, flexible rubber finish, and ability to reach narrow spaces make it valuable for electronics manufacturing, appliance assembly, maintenance, and specialty equipment. For the best results, follow the latest Momentive technical and safety documents and validate the product under the actual operating conditions of the final assembly.

Explore our industrial silicone adhesives and sealants for more electronics bonding, insulating, gasketing, and waterproof sealing solutions.

Momentive RTV118 Flowable Silicone Adhesive Sealant