Gasketing sealants
Black, flexible, RTV silicone sealant with excellent motor-oil resistance
Pasty, 1-part, silicone adhesive sealant, which cures at room temperature to form a tough, flexible rubber gasket with excellent oil resistance.
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- Description
- Technical specification
LOCTITE® SI 598 is a metallic black, 1-part, room temperature vulcanizing (RTV) oxime silicone paste sealant. It cures at room temperature on exposure to moisture in the air to form a tough, flexible, silicone rubber gasket. Its thixotropic nature allows for easy flow dispensing, while preventing the migration of liquid product once applied to the part. It has excellent resistance to motor oils and can withstand operating temperatures from -54°C to 260°C (-65°F to 500°F). It resists ageing, weathering, and thermal cycling without hardening, shrinking or cracking.
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Excellent motor oil resistance
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Forms tough, flexible, silicone rubber gasket
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Ideal for oil pans, transmission pans, valves and guides, differential covers
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Room Temperature Vulcanizing (RTV) curing
- Product category:
- Gasketing sealants
Technologies:
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Silicones, specialty
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Silicones, oxime
- Color:
- Black
- Cure type:
- Room temperature vulcanization (RTV) cure
- Fixture time:
- 30.0 min.
- Physical form:
- Paste
- Storage temperature:
- 8.0 °C - 21.0 °C
How to use
Clean surfaces with solvent-based (non-CFC), general purpose surface cleaner LOCTITE® SF 7070 to ensure surfaces are free of dirt, dust, oil and any other contaminants. Allow to dry.
Cut nozzle at 45° angle to create the proper bead diameter for your application. The appropriate bead diameter is dependent on the gaps that need to be filled, but it is best to start small and increase bead size if necessary. Typical bead sizes range from 1/8” to 1/4”. Screw cut nozzle onto tube for application.
Moisture curing begins immediately after the product is exposed to the atmosphere, therefore parts to be assembled should be mated within a few minutes after the product is dispensed.
Excess material can be easily wiped away with non-polar solvents.
For full automatic applications a volumetric dispensing system is recommended.
FAQ
Pre-Cut Gaskets also referred to as solid or compression gaskets are typically made of rubber, cork, metal or paper. They require the exact size and shape gasket for each seal, resulting in complex inventory management. Once assembled, the pre-cut gaskets can relax, shrink or become embrittled over time, creating leak paths and potential system failure or plant downtime. Liquid gaskets on the other hand are form-in-place gaskets and can be easily dispensed onto a infinite range of flange patterns, reducing inventory costs. Once cured, they remain leak-free over a long period of time, even when exposed to harsh chemicals and high operating temperatures and pressures. They provide a seal that won’t shrink, compress, crack or relax, eliminating the risk of potential leak paths or having to retighten over time.
Firstly, RTV stands for Room Temperature Vulcanization and refers to the curing process seen in silicone adhesives known as vulcanization, which is the change from a liquid to an elastic body. During the vulcanization (when crosslinking starts due to contact with atmospheric moisture), a by-product is released (referred to as condensation). The 1-part condensation cure silicone system is an ideal solution for numerous sealing, bonding and coating applications. Flowable, low viscosity products are suitable for potting and coating applications, whilst medium to high viscose products are suitable for sealing and bonding parts without adhesive run-off.
The operating temperature range for standard Loctite anaerobic threadlockers / thread sealants / gasketing adhesives is -55°C to +150°C. High-performance anaerobic grades, or alternative technologies such as silicones, can offer significantly improved temperature resistance depending on the specific application requirements. Consult Henkel's online product resources or contact our technical teams for further information .
All adhesives are compatible with metal substrates although bond strength and durability will vary depending on the technology selected. Anaerobic adhesives may cause stress-cracking in some sensitive polymers and therefore should generally be avoided on plastic parts. Consult Henkel technical teams for further advice as needed.
For flange sealing applications, anaerobic adhesives are preferable when high strength is required (usually for rigid machined parts rather than pressed/flexible flanges); when high chemical/solvent resistance is required; and on metal components where there is limited moisture or exposure to the environment. Silicones are recommended where there are large gaps, open/exposed bond areas, or when high flexibility or extremely high temperature resistance (generally in excess of 150°C) is required.
Both silicones and SMP adhesives provide excellent flexibility and gap-filling properties together with high adhesion to a wide range of substrates, making them ideal for elastic bonding & sealing applications. Silicones have superior thermal resistance for high-temperature applications, whereas SMP adhesives are suitable for applications that require over-painting. There are a range of properties available for each technology type. Please speak with a Henkel representative regarding your application to determine the best available grade.
LOCTITE® silicone adhesives can be used for such applications. High temperature resistance is a necessity and materials like LOCTITE® SI 5920 or LOCTITE® SI 5990 can be considered.
All necessary H&S measures and PPE (personal protection equipment) requirements can be found on the product material safety data sheet, all of which are available via the Henkel website.
Henkel has a number of products available with varying levels of NSF® and WRAS® approval, amongst others. Please contact the Henkel sales or technical teams with your requirements.
