Key Takeaways
- DOWSIL 7093 is a low-modulus, neutral-cure silicone sealant designed for general industrial bonding and sealing without corrosive by-products.
- It cures at room temperature by reacting with atmospheric moisture — no heat or mixing required.
- The alkoxy cure system means zero acetic acid emission, protecting sensitive metals and electronics.
- Stable from −50°C to +180°C, it outperforms organic sealants in thermally demanding environments.
- The European silicone sealants market is projected to grow at 5.6% CAGR through 2032, driven by advanced manufacturing and energy-efficiency regulations.
- Unprimed adhesion is achievable on glass, most metals, and common engineering plastics — reducing line complexity.
July 2026
A silicone sealant is a flexible, moisture-curing compound based on polysiloxane polymers that bonds and seals substrates across a temperature range of −50°C to +200°C, providing long-term resistance to UV radiation, chemicals, and mechanical stress. In industrial manufacturing, it is the go-to material wherever a joint must remain leak-tight, electrically insulating, and dimensionally stable through repeated thermal cycling.
What Is a Silicone Sealant and Why Does It Matter in Industry?
A silicone sealant is an elastomeric compound that cures to a flexible rubber when exposed to atmospheric moisture. Unlike conventional organic adhesives — based on carbon-carbon (C-C) or carbon-oxygen (C-O) backbones — silicones are inorganic polymers built on alternating silicon and oxygen bonds (Si-O). This fundamental difference in chemistry explains their exceptional performance envelope.
For production directors and plant managers across Europe, selecting the correct industrial silicone sealant translates directly into reduced warranty claims, fewer production stoppages, and longer service intervals for seals, gaskets, and bonded assemblies. Choosing the wrong cure system or modulus can lead to substrate corrosion, joint cracking, or premature adhesion failure — all costly problems that are avoidable.
Chemistry: Polysiloxane Backbone and Si-O Bond Energy
Silicone adhesives, or polysiloxanes, are inorganic polymers formed by a silicon-oxygen chain with organic groups attached to the silicon atoms. The defining chemical feature is the Si-O bond, with a bond dissociation energy of approximately 452 kJ/mol — significantly higher than the C-C bond (~347 kJ/mol) or the C-O bond (~360 kJ/mol) found in organic elastomers. This bond strength is the root cause of silicone’s superior resistance to heat, UV radiation, and oxidative degradation.
The inorganic backbone also gives silicone its hydrophobic character and low surface tension. Water and most polar solvents cannot break the Si-O chain, making silicone sealants the preferred choice wherever a joint is permanently exposed to humidity, condensation, or aqueous cleaning agents in manufacturing environments.
Cure Mechanisms: Acetoxy vs Alkoxy vs Neutral Cure
Not all silicone sealants cure the same way. Understanding the cure chemistry is critical when selecting a product for sensitive industrial substrates.
| Cure Type | By-product | Typical Substrates | Key Limitation |
| Acetoxy (acidic)Acetic acid vapour on cure | Acetic acid (vinegar-like odour) | Glass, non-corroding materials | Corrodes copper, zinc, cement |
| Alkoxy (neutral)Releases methanol or ethanol | Alcohol (low odour) | Metals, electronics, plastics | Slightly slower cure than acetoxy |
| Oxime (neutral) | Methyl ethyl ketoxime | Wide substrate range | VOC concerns in enclosed spaces |
DOWSIL 7093 uses an alkoxy cure system — the safest option for industrial environments because it releases only low-toxicity alcohols, produces no corrosive by-products, and is compatible with a wide range of metals including aluminium, steel, and copper alloys.
DOWSIL 7093: Technical Profile and Performance Data
DOWSIL 7093 Adhesive Sealant (formerly Dow Corning 7093) is a one-part, non-sag, neutral-cure silicone sealant engineered for general industrial sealing and bonding where non-corrosive cure is required. Manufactured by Dow, a world leader in silicone technology, it is available through authorised distributors including Mercouris — technical partner for adhesives, lubricants, electronics, and mould-making across Europe.
Key Properties at a Glance
| Property | Value / Description |
| Chemistry | One-part alkoxy-cure polysiloxane |
| Cure type | Moisture-cure at room temperature; no mixing required |
| Consistency | Non-sag paste — ideal for vertical and overhead seals |
| Operating temperature | −50°C to +180°C (continuous); short excursions to +200°C |
| Modulus | Low modulus — high movement capability, absorbs thermal cycling stress |
| Cure depth (23°C / 50% RH) | ≈2 mm per 24 hours; deeper sections require longer cure time |
| Shelf life | 12 months from production date; store below 30°C in sealed containers |
| By-product | Alcohol only (non-corrosive, low odour) |
| Colours available | Black, grey, white (verify at point of order) |
| Standard ref. | DOWSIL 7093 TDS — Dow Inc. |
Substrate Compatibility
One of the practical advantages of DOWSIL 7093 is its unprimed adhesion to many common engineering materials, reducing surface preparation steps and cycle time on the production line.
Good unprimed adhesion to:
- Glass (float, borosilicate, tempered)
- Most metals: aluminium, anodised aluminium, steel, stainless steel
- Common engineering plastics: ABS, polycarbonate, nylon, PMMA
- Ceramic and enamelled surfaces
- Painted or coated substrates (adhesion varies; adhesion test recommended)
Substrates where priming or testing is required:
- PTFE, polyethylene (PE), polypropylene (PP) — low surface energy
- Very porous or contaminated surfaces
- Substrates that have been treated with incompatible release agents
For challenging substrates, Mercouris’s technical team can recommend compatible primers from the DOWSIL range or alternative silicone adhesive sealant formulations. Contact our technical support service for an application-specific consultation.
Industrial Applications of Silicone Sealant Across European Manufacturing
The European silicone sealants market held a 26% share of global demand in 2024, with a projected CAGR of 5.6% through 2032 — driven by advanced manufacturing, automotive electrification, and the EU’s energy-efficiency renovation targets (source: Credence Research, 2024). Below are the primary industrial application areas where DOWSIL 7093 and similar industrial silicone sealants are specified.
Electronics and Electrical Equipment
Silicone sealants are essential in electronics manufacturing for encapsulating connectors, sealing power supply housings, and protecting PCBs from moisture ingress. The neutral alkoxy cure of DOWSIL 7093 makes it safe for use around copper traces and sensitive components that acetoxy-cure products would corrode. The product’s excellent dielectric properties also provide passive insulation between conductors in control panels and junction boxes.
Automotive and Transportation
Bonding materials with differing thermal expansion coefficients — such as glass to metal or plastic to aluminium — requires a sealant with low modulus and high elongation. DOWSIL 7093‘s flexible rubber cure absorbs differential expansion during thermal cycling, preventing delamination in door seals, headlamp housings, sensor mounts, and gearbox covers. Germany, France, and Italy — the EU’s three largest automotive producers — represent the core demand for RTV silicone sealants in this sector.
Industrial Equipment and General Manufacturing
Factory directors and maintenance engineers specify silicone sealants for formed-in-place gaskets (FIPG), housing seals on motors and pumps, and environmental sealing of control enclosures. DOWSIL 7093’s non-sag consistency enables precise bead application on complex joint geometries without slump, even on vertical surfaces. The full range of DOWSIL silicone adhesives and sealants at Mercouris covers viscosities and cure systems for diverse industrial bonding needs — from the same trusted alkoxy-cure technology through to flowable variants for automated dispensing. For related bonding challenges, we also supply anaerobic adhesives for threaded assemblies and methacrylate adhesives for structural bonding.
Lighting and LED Manufacturing
Luminaire manufacturers across Europe rely on silicone sealant to bond LED drivers and modules to aluminium heat sinks, and to seal ingress protection (IP) joints. The stable thermal performance up to +180°C is critical in high-lumen applications where junction temperatures are elevated. Neutral-cure formulations prevent discolouration of optics and printed circuit boards that would result from acetic acid outgassing.
Construction and Industrial Facades
The EU Renovation Wave Strategy targets the retrofit of 35 million buildings by 2030, creating sustained demand for high-performance silicone sealants in glazing, curtain wall systems, and industrial building envelopes. DOWSIL 7093’s weather resistance and UV stability ensure long service life in exterior applications, while its low modulus accommodates the structural movement of modern facade systems. The European Commission estimates that buildings account for around 40% of total EU energy consumption — making airtight, high-performance sealing a regulatory imperative, not just a design preference.
How to Apply DOWSIL 7093: Step-by-Step Process
Correct application of silicone sealant is as important as product selection. Even the best RTV sealant will underperform if the substrate is contaminated or the joint geometry is incorrect. Follow the procedure below to ensure maximum adhesion and cure consistency.
Step 1 — Surface preparation
All surfaces must be clean, dry, and free of contaminants. Remove oils, greases, dust, and previous sealant residues. Suitable solvents include isopropyl alcohol (IPA), acetone, or methyl ethyl ketone (MEK). Allow the solvent to evaporate fully before applying the sealant.
Step 2 — Priming (if required)
For substrates where unprimed adhesion is uncertain, apply the appropriate DOWSIL primer and allow full flash-off time as specified in the relevant primer TDS. Priming improves both initial adhesion and long-term durability, particularly on plastics and porous materials.
Step 3 — Application
Apply DOWSIL 7093 using a standard cartridge gun or pneumatic dispenser. The non-sag consistency allows precise bead control. For joint sealing applications, size the joint to accommodate the expected movement — joint width should be 2–3× the anticipated movement. Depth of sealant should be approximately half the joint width, with a minimum of 6 mm.
Step 4 — Tooling and finishing
Tool the bead within the open time (typically 5–10 minutes at 23°C / 50% RH) using a wetted spatula or tool. Smooth the surface and ensure good contact with both substrates. Use masking tape for clean, straight bead lines on visible joints.
Step 5 — Cure and handling
DOWSIL 7093 cures to approximately 2 mm depth per 24 hours under standard conditions (23°C, 50% RH). Full mechanical properties develop after complete through-cure. Avoid disturbing the joint during the initial cure phase. Increase ventilation to accelerate cure in humid environments; lower humidity will slow the cure.
For automated dispensing applications or high-volume production lines, contact the Mercouris technical team for guidance on viscosity adjustment, bead pattern design, and cure optimisation.
Silicone Sealant vs Other Industrial Sealants: Comparison
Selecting the right industrial sealant requires understanding the trade-offs between material classes. The table below compares silicone sealant with polyurethane (PU), MS polymer, and epoxy sealants on the criteria most relevant to European production environments.
When to choose silicone sealant: DOWSIL 7093 is the optimal choice when the joint must survive elevated temperatures, exposure to UV light or ozone, or cyclic thermal expansion between dissimilar materials. It is the only sealant class that retains full elasticity from −50°C upwards — a capability no organic elastomer can match.
When to consider alternatives: If the final assembly must be overpainted, or if the application demands very high structural strength with minimal flexibility (e.g. rigid bonding of load-bearing elements), an MS polymer or structural epoxy may be more appropriate. For a deeper dive into how silicone chemistry compares to other polymer classes, Mercouris’s technical guide on silicone adhesives covers selection criteria in detail, and the complete adhesives and sealants catalogue covers both requirements across all adhesive families.
Regulatory and Sustainability Context in Europe
European plant managers and procurement directors must navigate an increasingly complex regulatory landscape. The following frameworks are directly relevant to silicone sealant selection and use in industrial settings.
REACH Regulation (EC No 1907/2006):
Dow provides a current Safety Data Sheet (SDS) for DOWSIL 7093 in compliance with REACH requirements. The product does not contain substances of very high concern (SVHC) above the 0.1% w/w threshold as registered at the time of publication. Always download the current SDS from Dow or your authorised distributor before use.
VOC Directive (2004/42/EC):
The alkoxy cure of DOWSIL 7093 releases small quantities of alcohol, which are classified as VOC. Ensure adequate workplace ventilation per the SDS guidelines. The alcohol by-product is significantly less hazardous than the acetic acid released by acetoxy-cure silicones, and the total VOC loading per application is low.
EU Renovation Wave and Energy Performance of Buildings Directive (EPBD):
The European Green Deal and the revised EPBD (Directive 2024/1275/EU) set new energy performance benchmarks that make high-quality silicone sealants a technical requirement rather than a product preference in construction and industrial building applications. Eurostat reports that construction output across the EU-27 expanded by 3.2% in 2023, underpinning sustained demand for performance sealants.
The European silicone market was valued at USD 5.83 billion in 2024 and is projected to reach USD 9.33 billion by 2033 (source: Market Data Forecast, 2024), reflecting both the breadth of industrial silicone applications and the structural demand growth from Europe’s green building and clean-energy transition.
Frequently Asked Questions
What is the difference between an acetoxy and a neutral-cure silicone sealant?
An acetoxy-cure silicone sealant releases acetic acid (the smell of vinegar) as it cures, which can corrode copper, brass, cement, and natural stone. A neutral-cure silicone — such as DOWSIL 7093 — releases only alcohol or ketoxime, making it safe for metals, electronics, and porous substrates. For industrial use, neutral cure is recommended unless the substrate is confirmed non-reactive.
How long does DOWSIL 7093 silicone sealant take to cure fully?
Surface tack-free time is typically 30–90 minutes at 23°C / 50% RH. Cure depth progresses at approximately 2 mm per 24 hours under standard conditions. Full mechanical properties require complete through-cure, which for joints deeper than 6 mm may take several days. Higher humidity and temperature accelerate cure; lower humidity and temperature slow it.
Can DOWSIL 7093 be used as a formed-in-place gasket (FIPG)?
Yes. DOWSIL 7093’s non-sag paste consistency and room-temperature moisture cure make it well-suited for FIPG applications on pump housings, gearbox covers, and electronic enclosures. The bead is applied to one flange surface, the assembly is mated and clamped, and the sealant cures to a flexible gasket in situ — eliminating the cost and inventory of cut gaskets.
Is silicone sealant paintable?
Standard silicone sealants, including DOWSIL 7093, are not paintable once cured because their low surface energy prevents paint adhesion. If the joint must be overpainted, consider an MS polymer sealant or a paintable hybrid formulation. Mercouris can advise on the correct alternative sealant products for your application.
What temperature range does DOWSIL 7093 silicone sealant withstand?
DOWSIL 7093 remains stable and flexible from −50°C to +180°C in continuous service, with short-term excursions up to approximately +200°C. This range exceeds the performance of polyurethane and MS polymer sealants, and matches the demands of most industrial sealing and bonding applications.
Does silicone sealant adhere to plastic without a primer?
DOWSIL 7093 achieves unprimed adhesion on many engineering plastics such as ABS, polycarbonate, and PMMA. However, polyolefins (PE, PP) and PTFE have low surface energy and require priming or mechanical treatment for reliable adhesion. Always perform an adhesion test on the specific plastic grade used in production before full deployment.
How should I store industrial silicone sealant to maintain shelf life?
Store DOWSIL 7093 at or below 30°C in original, sealed containers, away from moisture sources and direct sunlight. The shelf life is 12 months from the production date. Exposure to humidity before cartridge opening initiates premature curing and reduces usable life. FIFO (first-in, first-out) stock rotation is recommended for production environments.
Where can I request a technical datasheet or safety datasheet for DOWSIL 7093 in Europe?
Technical Data Sheets (TDS) and Safety Data Sheets (SDS) are available directly from Dow’s official product page or through authorised distributors such as Mercouris. Mercouris’s technical team can also provide application-specific datasheets and compliance documentation required for European procurement and EHS processes.
Ready to Improve Your Production Line with the Right Silicone Sealant?
Selecting the correct industrial silicone sealant is not a commodity decision — it directly affects product reliability, compliance, and total cost of ownership. DOWSIL 7093 delivers proven performance across electronics, automotive, industrial equipment, lighting, and construction applications throughout Europe.
With over 40 years of experience as a technical partner to European manufacturers, Mercouris provides not just product supply but expert application support — from substrate compatibility testing to automated dispensing optimisation.
Contact Mercouris’s technical team to request a sample of DOWSIL 7093, obtain a technical datasheet, or discuss the right silicone sealant for your specific bonding or sealing challenge. The team responds within 24–48 hours.