High temperature silicone sealant for automotive and industrial applications is a completely different product to the neutral cure silicone used in bathrooms and kitchens. Put the wrong grade on an engine bay penetration or an industrial oven seal and you’re not just looking at early failure – in some applications it’s a genuine safety issue. Here’s what the right product looks like and when you need it.
Why Standard Silicone Sealant Fails in Automotive Applications
Standard construction silicone the kind used for wet areas and facades is rated for service temperatures up to around 80-90°C depending on the grade. Under a bonnet, around exhaust penetrations, or near engine components, ambient temperatures regularly exceed 150°C and surface temperatures on metal components can be significantly higher than that.
Standard silicone in these locations will degrade, lose adhesion, and eventually fail. When it fails on a gasket or a cooling system penetration, it’s not just an inconvenience it’s a potential fluid leak or overheating issue. The right product for automotive applications is a specialist high-temperature silicone rated for continuous service at 200°C or above.
High Temperature Silicone Sealant: What the Temperature Rating Means
When a silicone sealant is rated for 200°C or 250°C, that rating refers to continuous service temperature the temperature at which the product maintains its properties over an extended period. Intermittent exposure to higher temperatures is typically within the product’s capability, but sustained exposure above the continuous rating will cause degradation.
| 🔧 PRODUCT SPOTLIGHT: Simseal RTV Seal – High Temperature Industrial Silicone
✔ Continuous service range -60°C to 250°C – right for automotive and industrial applications ✔ Resistant to oils, fuels, and automotive fluids once cured ✔ Non-corrosive – safe for use around electrical components and sensors ✔ Cures at room temperature – no heat cure required during application |
Cabinet Making and Joinery: Choosing Between Silicone and Adhesive
Cabinet making and joinery is another area where the wrong product causes unnecessary headaches. For kitchen cabinetry, the silicone used at benchtop-to-splashback junctions and around sink cutouts needs to be food-safe, neutral cure, and colour-matched to the benchtop. Standard construction silicone in a kitchen environment will discolour and mould faster than a food-safe formulation.
For structural bonding in cabinet and joinery construction gluing panels, backs, and shelves a construction adhesive is more appropriate than silicone. The Simseal Octogrip provides instant grab and cures to a strong, flexible bond without the mess of traditional PVA or contact adhesive.
➤ Reference: CSIRO – Materials performance in high-temperature industrial environments
➤ Reference: Standards Australia – Sealant and adhesive standards for manufacturing applications
Buy the Right High Temperature Silicone Sealant for Your Application
Whether you’re working on engines, boats, cabinetry, or manufacturing, the product range makes a difference. Using a construction product in an automotive application – or vice versa – costs you time and the client’s confidence.
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