LOCTITE® SI 593 Black RTV Silicone Adhesive Sealant – General-Purpose Acetoxy Cure
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LOCTITE® SI 593 BLACK is a one-component, room-temperature-vulcanizing (RTV) acetoxy silicone sealant. It cures on exposure to moisture in the air to form a tough, flexible black silicone rubber seal that resists extreme temperature cycling, UV light, and ozone without hardening, shrinking, or cracking.
Key Features
- One-component acetoxy silicone; no mixing required
- Thixotropic, non-slumping paste holds its shape on vertical and overhead surfaces
- Cures to a tough, flexible black rubber seal at room temperature
- Temperature resistant to 204°C (400°F); withstands extreme temperature cycling, UV light, and ozone
- Will not slump, harden, shrink, or crack over time
Common Uses
- General-purpose sealing of oven flues, flue collars, and glass meter covers
- Noise-dampening pad bonding and flexible rubber bonding
- Weatherproofing ventilation units and dressing gaskets
- Automotive and industrial gasket sealing, wiring protection, and bonding on glass, metal, and most plastics
How to Use
- Clean and dry surfaces; remove all oil and grease.
- Apply product to the surface. For bonding applications, apply to one surface only and join surfaces immediately.
- Wipe away excess material immediately.
- Allow approximately 60 minutes to reach tack-free/surface cure; allow 24 hours for full cure.
Product Specifications
| Brand | Loctite |
|---|---|
| Also Known As | SI 593 Black RTV Silicone Sealant |
| Technology | Silicone (acetoxy) |
| Components | One component, no mixing |
| Cure Type | Room temperature vulcanizing (RTV), moisture cure |
| Appearance (uncured) | Black, thixotropic paste |
| Odor | Acetic acid |
| Specific Gravity | 1.01 @ 20–25°C |
| Tack-Free Time | ≤60 minutes |
| Full Cure | 24 hours |
| Tensile Strength (cured, 1 wk @ RT) | ≥1.5 N/mm² (≥215 psi) |
| Elongation (cured) | ≥300% |
| Shore A Hardness (cured) | ≥18 |
| Extrusion Rate | ≥250 g/min |
| Flash Point | >93°C (>199°F) |
| VOC Content | <3%; 30 g/L |
| Storage | 8°C to 21°C (46°F to 70°F); avoid below 8°C or above 28°C (82°F) |
| Temperature Resistance | Up to 204°C (400°F) |
| Item Numbers | 80 mL Tube – 491979; 190 mL Power Can – 2636979; 300 mL Cartridge – 495315 |
Important Limitations
Not recommended for use in pure oxygen or oxygen-rich systems, or as a sealant for chlorine or other strong oxidizing materials. Cannot be painted once cured. Per the current SDS (Rev. 007.0, 03/11/2020), this product is not classified as a DOT/GHS transport hazard and is not regulated for ground, air, or water shipment. The available SDS does not address California Proposition 65 status.