Silicones

• Watertight: They are 100% watertight. This makes them ideal sealants in many applications.
• Flexible: They remain flexible after curing. Certain silicones retain this property even in low temperatures.
• Good adhesion: They have strong adhesive properties. They are well-suited for sealing joints between dissimilar materials (e.g. glass and aluminium).
• Heat resistance: They have good heat resistance. Specific sealants are available for applications that require exposure to high temperatures.
• Chemical resistance: They are resistant to chemicals. Special silicones can be manufactured to resist specific substances.
• Electric insulation: Silicone sealants are useful for the insulation of electric and electronic materials.

There are two main types of silicone sealants: acetoxy and neutral. The difference is based on their curing process.

1. Acetoxy: This type releases acetic acid while curing. This causes a strong, vinegar-like smell. Acetic acid can be damaging to sensitive substrates. However, acetoxy silicones are still common, due to their lower cost. They are often used in industrial applications.
2. Neutral: They release non-corrosive substances while curing. This makes them ideal for electric applications. Neutral silicones are odourless. They are more expensive than acetic ones.

1-part ones cure with no additional support. The product will begin to harden at room temperature. These silicones are easier to use, as they require no mixing.

2-part ones cure with the help of a curing agent. They require accurate measuring and mixing. They allow for an even curing process. 2-part ones are often used in moulding applications.