Adheseal Allflex 101 Hybrid Acrylic Sealant

For sealing and adhering interior and exterior building joints subject to movement, Allflex 101 Hybrid Acrylic Sealant provides a clear finish that cures by water evaporation. It applies white for high visibility during installation and transitions to clear as it dries. The formulation is low-modulus to accommodate joint movement of ±25% without cracking or losing adhesion, making it suitable as a glazing and bedding compound for timber joinery, and for sealing around windows, doors, and precast panels.

How it works

Allflex 101 is a hybrid acrylic sealant that relies on atmospheric humidity and the evaporation of water to cure. It dries to a highly elastic, clear solid with a Shore A hardness of 10, maintaining its flexibility in both hot and cold climates. The sealant resists slumping during vertical applications and exhibits strong adhesion to both porous and non-porous substrates without a primer. Because it contains no isocyanates, it is non-toxic, non-hazardous, and paintable after curing.

Numbers that matter

• ±25% movement capability: Accommodates joint expansion and contraction under thermal and structural movement.
• 1150% elongation at break: High elasticity to stretch without tearing or cohesive failure.
• 2mm per 24 hours cure rate: Cures at a depth of 2mm daily at 25°C and 50% relative humidity, reaching full cure in 4 to 6 days.
• 24 g/L VOC: Low volatile organic compound content for interior use.
• 10-minute skin time: Working window to tool joints to a flat finish before a skin forms.

Where to use it

Suitable for sealing and adhering to the following substrates:

• Glass, aluminium, powder coat, and anodised aluminium
• Timber and timber joinery rebates
• Plastics, acrylic, and polycarbonate (including roofing)
• Masonry, brick, stone, and cement sheet
• Waterproof membranes
• Painted surfaces, rubber, fibreglass, and porcelain
• Metals (excluding lead and copper)

Limitations

• Do not use for permanent water immersion, such as swimming pools or fish tanks.
• Do not use where joint movement is expected to exceed 50% of the original joint dimensions.
• Do not use in high-abrasion areas, such as joints subject to foot traffic.
• Do not use in totally confined spaces; the sealant requires atmospheric humidity to cure.
• Do not use for structural glazing (use N-80 or N-60 Glazing silicone instead) or mirror adhesion (use High Power 609 instead).
• Do not use on lead or copper substrates.
• Do not use on composite panels without preliminary testing (Hi Flex Construction is recommended instead).
• Do not use on marble, granite, or stone without a prior stain testing program (S100 is recommended for marble and granite after testing).
• Three-sided non-porous channels (such as aluminium or plastic) can significantly extend curing times and risk product wash-out if exposed to water before curing.
• Protect the sealant from water until it has dried completely clear.
• Do not clean or treat the sealant with solvents or cleaning agents that may discolour or affect the polymer during its curing window.

Installation and joint design

Surfaces must be structurally sound, dry, clean, and free of dust, oils, grease, curing compounds, and surface water. Concrete must cure for at least 28 days before application to prevent subsequent delamination.

For expansion joints, design the joint width-to-depth ratio at 2:1 where possible.

• Internal joints: Minimum 6mm width and depth, maximum 10mm depth.
• External joints: Minimum 10mm width. For joints deeper than 10mm, use an open-cell foam backing rod 25% larger than the joint width.
• Three-sided adhesion: Use polyethylene tape or a bond breaker on flat joints to limit adhesion to two sides and allow proper movement.

Tool the joint flat with a moistened spatula within 10 minutes of application. Clean wet tools and spills with water or Xylene; cured material must be removed mechanically.

Priming requirements

While Allflex 101 normally adheres without priming, specific joint conditions require surface pre-treatment:

• Non-porous substrates: Slightly roughen aluminium, waterproof membranes, stainless steel, PVC, galvanised steel, powder-coated metals, or glazed tiles with a fine abrasive pad. Clean and pre-treat with Adheseal 50A surface prep. Apply sealant between 30 minutes and 2 hours after priming.
• Porous substrates: Prime concrete, aerated concrete, cement-based renders, mortars, and bricks with Everflex Supaprime. Apply sealant between 30 minutes and 2 hours after priming.