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High Performance Silicone Sealant

From $8.50

High-Performance 100% neutral cure all-purpose Silicone Sealant. Food contact grade, ±50% movement capability silicone sealant formulated to give superior adhesion and durability in a wide range of glazing, weather sealing, and industrial applications.

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High Performance Silicone Sealant

Alseal AS-205 High-Performance Silicone Sealant is a one-component Premium Grade Silicone Sealant. ALSEAL AS-205 is a 100% neutral cure silicone sealant whose formula gives superior adhesion and durability in a wide range of glazing, weather sealing, and industrial applications. It complies with the FDA testing method intended for direct food contact. It has excellent resistance to weathering, UV radiation, vibration, moisture, ozone, temperature extremes, airborne pollutants, and many cleaning detergents and solvents.

ldeal for sealing metal lap joints in roofing, guttering, and cladding applications. It will bond to form a strong weatherproof seal on most common building materials. Such as aluminum, galvanized steel, zinc-coated steel, painted surfaces, glass, brick, concrete, marble, and mirror bonding.

This product was assessed according to the evaluation criteria of the Singapore Green Building Product Labelling Scheme.



  • 100% neutral silicone
  • ASTM C920 compliant
  • ±50% movement capability
  • FDA compliant
  • Low VOC
  • Excellent weathering resistance
  • Permanently flexible
  • lndoor and outdoor use
  • Odorless


  • ASTM C920 & ASTM C719, Type S, Grade NS, Class 50, Use NT, M, A and G
  • FDA 21 CFR Part 175.300
  • Low VOC – USEPA Method 24 under SCAQMD Rule 1168
  • RoHS I & RoHS II (EU Directive 2015/863)

More information about product www.alseal.com.au

Additional information

Weight N/A
Dimensions N/A

Black, Dark Grey, Grey, Translucent, White


Cartridge, 24 pcs cartridges box, Sausage, 20 pcs sausages box

Technical Information

Technical Data

Curing system: Moisture curing
Density: Approx. 1.48 g/mL
Tensile at break (ASTM D412) : >1.8 N/mm²
Tensile at break (ISO 8339) : 0.60 N/mm² (6.2 kgf/cm²)
Elongation at break (ASTM D412) : >400 %
Lap shear strength (ASTM D1002) : >1.0 N/mm² (Al to Al)
Shore A hardness (ASTM C661): 35 – 45
VOC content (USEPA Test Method 24) : <10 g/L

Usage Instructions

1. Surfaces must be clean, dry and free of dirt, grease, oil or water.
2. Surfaces should be cleaned with alcohol, M.E.K. or other suitable solvents. Do not use soap or detergent.
3. For a neat finishing, apply masking tape and remove it before sealant skins over.
4. Cut the tip off and puncture the internal foil seal with the nozzle. Cut the nozzle at 45° angle to the desired dead-width and apply the sealant to substrate with a cartridge gun.
5. Tool the sealant within 5 minutes of extrusion before it skins. Tack-free in 10 minutes.
6. Uncured sealant can be cleaned up with mineral spirits.

Clean Up

  • Wet sealants can be cleaned up with acetone or mineral spirits.
  • Cured sealants can only be removed mechanically.

Joint Design

  • The joint dimension should be designed by taking into consideration the movement capability of the sealant and the anticipated joint movement.
  • Generally, the joint width-to-depth ratio is 2:1 for joint width ≥12 mm, or 1:1 for joint width <12 mm.
  • Joint width: minimum = 6 mm, maximum = 35 mm. *
  • Joint depth: minimum = 6 mm, maximum = 12 mm.
    * Sealing joints with larger joint width is possible but sealant may sag in vertical applications.


  • Calculation formula:
    X / [(Y x Z) x 1.1] = Coverage
    X = volume of cartridge (or sausage) in ml,
    Y = joint width in cm, Z = joint depth in cm,
    1.1 = 10% wastage assumption,
    Coverage = lineal meter run in cm per cartridge


Not recommended for the following applications:

  • Below waterline or permanent water immersion.
  • Outdoor sealing/bonding adjacent to glass substrates.
  • Polyethylene, polypropylene, polytetrafluoroethylene (Teflon), neoprene, and bituminous surfaces.
  • Overcoated with:
    – Alkyd resin paint – cure inhibition to the paint
    – Chlorinated paint – staining issue
    – Oil-based paint – not compatible
  • Used in trafficable joints greater than 10 mm in width. For trafficable joint above 10 mm width, a steel cover plate is required.


Every endeavor has been made to ensure that the information given herein is true and reliable but it is given only for the guidance of our customers. The company cannot accept any responsibility for the loss or damage that may result from the use of the information, due to the possibility of variations of processing or working conditions and of workmanship outside our control. Users are advised to confirm the suitability of this product by their own tests.

Keep out of reach of children. Contains aminosilane. May produce an allergic reaction. Safety data sheet available on request. For further health and safety information, consult the latest safety data sheet.


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