Silicone Sealant
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What is Silicone Adhesive (RTV-1 Silicone Adhesive)?
Our 1-component silicone adhesives / silicone glues are RTV-1 (room-temperature vulcanising) systems that cure through atmospheric moisture. They serve as a silicone adhesive sealant: one product that both bonds and seals.
Available in neutral-cure (alkoxy/oxime) and acetic-cure (acetoxy) versions, with variants from transparent "clear RTV" to black, and in flowable or thixotropic, paste-like consistencies.
Key Properties
- 1-component: straight from the tube/cartridge; no mixing required
- Bonding + sealing: one product for gluing and sealing
- Substrates: metal, glass, ceramics, many plastics* and painted parts
- Performance: temperature resistant, elastic, durable
*Check the datasheet and primer advice; some plastics (PE/PP/PTFE) require pretreatment.
📄 Technical Documentation
Download the complete product overview:
Wacker Elastosil RTV-1 Product Overview (PDF)Choosing a silicone adhesive: cure system, colour and processing
Neutral vs acetic
- ✓Neutral (alkoxy/oxime): non-corrosive, widely applicable
- ✓Acetic (acetoxy): excellent adhesion to glass/ceramics
Transparent or black
- →Transparent: "clear RTV" for inconspicuous joints
- →Black/white/grey: appearance, contrast or light-tight
Flowable vs paste
- →Flowable: self-levelling, capillary flow
- →Paste: thixotropic, non-slump on vertical surfaces
WACKER ELASTOSIL E41 Silicone Adhesive
ELASTOSIL E41 (also searched for as elastosil e41 and wacker elastosil e41) is a popular neutral-curing RTV-1 for bonding and sealing in general engineering.
Available in various colours/viscosities; see the ELASTOSIL RTV-1 product overview for specifications, primer advice and processing tips.
- Adhesion to glass, metals, ceramics and many plastics
- Durable sealing with lasting elasticity
- Electronics-friendly in neutral variants (non-corrosive)
Applications of silicone adhesive & silicone glue
Bonding
Glass/metal parts, housings, panels and components
Sealing
Joints, feed-throughs, enclosure covers, IP seals
Automotive/Mechanical Engineering
Vibration-resistant seals, formed-in-place gaskets
Electronics
Non-corrosive sealing (neutral) around PCBs and connectors
Similar searches & alternatives
Searching for these terms and looking for a suitable alternative from our range? We are happy to advise you.
Loctite Superflex RTV Silicone Adhesive Sealant
Frequently searched market term; comparable field of application. We offer high-quality RTV-1 silicone adhesives such as WACKER ELASTOSIL E41 with comparable performance.
Permatex Black Silicone Adhesive Sealant 81158
Looking for a black version? We will recommend a black RTV-1 silicone adhesive from our range based on your substrates and temperature class.
Permatex Clear Silicone Adhesive Sealant
For transparent bonded/sealed joints, choose a clear RTV silicone adhesive sealant (neutral recommended for electronics/metals).
Silicone Adhesive Sealant – Generic Name
The generic English product name for silicone adhesive / silicone glue. Use our selection guide to find the right cure system and the desired viscosity/colour.
Frequently Asked Questions (FAQ)
Is there a difference between silicone adhesive and silicone sealant?
In practice we use the umbrella term silicone adhesive sealant: one product that both bonds and seals. The difference lies mainly in viscosity (flowable vs paste) and in the cure system (neutral vs acetic).
When should I choose a neutral rather than an acetic silicone adhesive?
Neutral (alkoxy/oxime) is non-corrosive and widely applicable (glass, metals, electronics). Acetic (acetoxy) adheres very well to glass/ceramics, but can attack certain metals.
Does RTV-1 adhere to metal and glass without a primer?
Often it does, but the highest and most durable adhesion is achieved through thorough cleaning/degreasing and, where necessary, a suitable primer/adhesion promoter. Consult the datasheet.
Getting started
Compare neutral/acetic, transparent/black and flowable/paste. For a quick start we recommend WACKER ELASTOSIL E41 as a versatile RTV-1 silicone adhesive. Contact us for the best match with your substrates and temperature class.