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**Silicone Explained**
While purchasing a silicone sealant or adhesive might seem simple enough, the truth is that there are multiple options available, each with varying strengths and characteristics. Silicone sealants and adhesives are highly flexible and resistant to UV light and extreme temperatures. Derived from silica, a common mineral found in materials like glass, beach sand, granite, and quartz, silicone is typically heat-resistant and rubber-like. It is widely used as a sealant, adhesive, lubricant, in medical components, cookware, and more. This blog will focus specifically on silicone as a sealant and adhesive, rather than exploring its other applications.
In the construction industry, silicone has become the go-to product. Whether you're renovating your bathroom, roof, or kitchen, you'll likely need a silicone product to seal joints and complete your work. Silicones are excellent at preventing water ingress, minimizing mold, and creating a watertight or airtight environment in specific applications. One of our favorites at Aerobolt is the Bostik® 6S range. The 6S is a neutral-cure silicone, meaning it releases a faint alcoholic vapor as it dries, making it ideal for indoor use. Bostik® 6S is a single-component sealant that cures into a flexible and durable elastomeric seal, available in a variety of colors to match or complement its surroundings. Some key features include: (1) Contains a fungicide to resist mold, (2) Excellent adhesion properties to powder-coated steel and glass, and (3) Will not slump in typical joints. Pretty clever, huh?
**Silicone as an Adhesive or Sealant**
Before diving deeper into the world of silicones, let’s address a fundamental question: What’s the difference between an adhesive and a sealant? An adhesive is a high-strength product designed to join two materials together, while a sealant or joint sealant is a lower-strength caulking product meant to fill and seal gaps between different materials. For example, Bostik® V60 is considered an adhesive that works exceptionally well on painted and anodized aluminum and glass, whereas the 6S range from Bostik® is a silicone sealant ideal for caulking joints.
This distinction is crucial, yet there are many adhesives that can function as sealants and vice versa. Understanding your application and desired outcome is key to selecting the right product.
**When and Where to Use Silicone**
Silicone adheres to nearly any surface and is ideal for a wide range of building applications, particularly on wet or exterior surfaces. It stands up well to sunlight and extreme temperatures.
One common use for silicone caulk is sealing around plumbing fixtures like bathtubs, showers, toilets, and sinks. It’s also great for weatherproofing your home by sealing around doors, windows, and utility cables entering from outside. This helps minimize drafts and keeps out pests like rodents and vermin.
Silicone is also excellent for cold-weather applications. Unlike polyurethane, which can become stiff and fail to bond in low temperatures, silicone remains flexible and continues to perform effectively in cold climates.
**After Application**
Once applied, silicone takes a relatively long time to dry and may emit unpleasant or potentially harmful fumes during installation. Therefore, ensure proper ventilation during use and protect the area from moisture for several days post-application to allow it to dry thoroughly.
**Silicone Advantages and Disadvantages**
Silicone has unique properties and applications, making the choice of the right silicone product dependent on the specific requirements of the application.
**Pros:**
- Exceptional temperature resistance, able to withstand extreme heat and cold.
- Flexible and maintains properties across a wide temperature range.
- Great electrical insulator, preventing the flow of electricity.
- Facilitates thermal movement between different materials.
- Resistant to moisture, chemicals, mold, and UV light.
**Cons:**
- Low tear resistance.
- Not easily paintable.
- Can have a sticky or tacky surface.
**Everyday Applications**
Silicone is commonly used in home repairs and maintenance, from fixing leaking sinks to rejoining shower screens to tiles. For both DIY enthusiasts and professionals, silicone sealant or adhesive is an indispensable tool.
It’s also extensively used in residential and commercial construction as an adhesive and joint sealant for materials exposed to extreme weather conditions. Its strong binding capabilities make it ideal for sealing windows, frames, and other architectural elements.
Due to its chemical composition, silicone can adhere to glass, plastic, and metal, making it the top choice for glass applications such as sealing windows, aquariums, and glass partition walls. Bostik V60 is particularly popular for exterior glass installations and interior glass partitions.
Silicone is also vital in electronics and appliance manufacturing, providing insulation and protection against harsh environmental conditions. In mechanical and motor body fabrication, it is used for sealing electrical components like lights, blinkers, and sensors.
**Where is Silicone Used?**
Silicone is ubiquitous in our daily lives, often unnoticed. Here are some common applications:
- **Medical Devices**: Silicone is bacteria-resistant and used in devices like defibrillators, heart pumps, catheters, and CPAP masks.
- **Construction**: Silicone binds building materials like concrete, plastics, and glass, ensuring stability.
- **Electronics**: Widely used in smartphones and other devices to prevent water damage and protect components.
- **Aviation**: Silicone adhesives seal critical aircraft parts like doors, windows, fuel tanks, and vents.
- **Household Items**: From water bottles to silicone-coated cookware and baby bottles, silicone is everywhere.
**Different Types of Silicone Explained**
**Acetoxy Silicone Sealants**
These release acetic acid (vinegar-like smell) as they cure. Known for their fast curing time and rigidity, they are widely used but have poor adhesion.
**Neutral (Neutral Alkoxy) Silicone Sealants**
Release alcohol as they cure, producing minimal odor. They adhere better to a broader range of materials compared to acetoxy sealants but are slower to cure and more expensive.
**Low Modulus Sealants**
Flexible yet less durable, these sealants offer better adhesion and more flexibility, ideal for high-moving joints like window frames.
**High Modulus Sealants**
Less flexible but more durable, recommended for sealing baths, showers, and other sanitary applications.
**Neutral vs. Acetoxy Cure**
The terms refer to the curing process. Neutral cure silicones release an alcoholic vapor, offering better adhesive properties across a wider range of materials. Bostik’s Industrial Grade Silicone is a great example, with superior adhesive properties.
Acetoxy silicones release an acidic vapor (like vinegar), making them suitable for high-temperature applications like Bostik® RTV 922.
**Low & High Modulus Explained**
Low modulus silicones are more elastic, accommodating material movement better. Bostik® 5CLM is a prime example.
High modulus silicones are more rigid, like Bostik® V60, which excels in painted and anodized aluminum and glass applications.
**Main Silicone Adhesive & Sealant Applications**
In Australia, you’ll find a variety of silicone options. Examples include RTV silicone for sealing and bonding, silicone rubber for industrial and construction uses, silicone oil as a lubricant, silicone sealant for construction, and silicone adhesive for electronics and automotive.
**Popular Silicone Brands**
Brands like Bostik, Selleys, DowCorning, and Geocel offer diverse silicone products tailored to specific needs. Each brand has its unique features and applications.
**Conclusion**
No single silicone product fits every application. Choosing the right one depends on its flexibility, durability, and resistance. With proper understanding and selection, silicone sealants and adhesives remain flexible, water-resistant, and reliable. Aerobolt offers a comprehensive range of adhesives and sealants, including the full Bostik range. Feel free to reach out at +61 2 9755 3747 for all your adhesive and joint requirements.
**Copyright © 2024 Aerobolt Australia Pty Ltd. All rights reserved.**
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