Flexible sealants
Red, flowable high-temperature RTV silicone sealant
This flowable, 1-part silicone adhesive sealant cures at room temperature to form a tough rubber seal with high temperature resistance.
All marks used are trademarks and/or registered trademarks of Henkel and its affiliates in the US, Germany, and elsewhere.
- Description
- Technical specification
LOCTITE® SI 596 is a red, flowable, smooth, 1-part RTV (room temperature vulcanizing) acetoxy silicone paste sealant that cures at room temperature on exposure to moisture in the air to form a tough, flexible, waterproof, oil-resistant silicone rubber bond. It resists temperatures up to 316°C (600°F), making it well suited for sealing applications in industrial furnaces, ovens, boilers, exhaust stacks, high temperature ducting and heating elements in electrical appliances. It resists aging, weathering and thermal cycling without hardening, shrinking or cracking.
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High temperature, flexible adhesive/sealant
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Resists ageing, weathering and thermal cycling without hardening, shrinking or cracking
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Suitable for applications up to 316°C (600°F)
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Flowable
- Product category:
- Flexible sealants
Technologies:
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Silicones, specialty
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Silicones, acetoxy
- Application method:
- Dispense gun,Dispense system,Manual
- Applications:
- For high temperature applications,Formed in place (FIP) sealing,Gasketing,Sealing
- Chemical basis / base:
- Acetoxy silicone
- Color:
- Red
- Cure type:
- Room temperature vulcanization (RTV) cure
- Extrusion rate, @ 15.0 sec. (25.0 °C):
- ≥ 250.0 g/min.
- Key characteristics:
- Flexible,Temperature resistant,Thixotropic
- Number of components:
- 1 part
- Operating temperature:
- -75.0 °F - 600.0 °F (59.0 °C - 316.0 °C)
- Physical form:
- Paste
- Recommended for use with:
- Metal
- Storage temperature:
- 8.0 °C - 21.0 °C
- Tack free time:
- 30.0 min.
How to use
Ensure all surfaces are cleaned to remove any residual adhesives, oil and grease. Use LOCTITE® SF 7200/790 for easier removal of old adhesive residues. LOCTITE SF 7063/7064/7070 is recommended for general surface cleaning and degreasing prior to bonding.
Use supplied nozzle and, where appropriate, cut the end to give the desired bead size. Dispense adhesive bead(s) directly onto the surface to be bonded or sealed; parts should be assembled immediately to prevent partial curing and shimming. Prevent the assembled parts from moving during cure. For large areas where both substrates are impermeable to moisture, do not cover the complete bonding area with adhesive - allow some gaps for moisture to penetrate the bond line. Any remaining gaps can be filled once the adhesive has cured.
Hold the nozzle at a 45° angle and pull along the bondline while applying dispense pressure. Test on a piece of scrap to find the appropriate speed that gives the required bead size. After assembling the parts, wipe away product squeezed out of the joint with a gloved finger or a finishing tool. Leave the nozzle on the cartridge after use to act as a sealing cap.
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.
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 liquid gaskets have been specially formulated for high temperature engine sealing applications. However due to the very high temperatures generated in the combustion chamber care should be taken when specifying liquid gasketing materials around the cylinder head or exhaust manifold. Please consult the Henkel technical team for further advice where necessary.
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.
