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Allflex 101: A Technical Overview
Allflex 101 is a high-performance hybrid acrylic sealant formulated for joint sealing, glazing, and bedding across a broad range of construction materials. With an exceptional elongation capacity of 1000% and a ±50% joint movement rating, it is engineered for demanding Australian conditions, from -18°C to +60°C. Unlike traditional solvent or silicone-based sealants, Allflex 101 dries clear, remains permanently flexible, is low in VOC (32g/L), and bonds securely without primer to most substrates including timber, polycarbonate, glass, metal, plastics, and masonry. Ideal for use in glazing, weatherproofing, and façade detailing where paintability, mould resistance, and strong adhesion are required.
Core Features & Specifications
- Hybrid acrylic formulation with water-based curing
- Extreme elongation at break (1000%) and ±50% movement capability
- Excellent weather and UV resistance with clear curing finish
- Bonds to most building substrates without primer
- Paintable, mould-resistant, non-toxic and non-hazardous
- Suitable for interior and exterior use in all climates
- VOC compliant (32 g/L) to South Coast AQMD Rule 1168
- Shelf life: 24 months (cool, dry storage between 10–35°C)
The Allflex 101 Advantage
- Replaces multiple sealants—suitable for both glazing and façade joints
- Cures from white to clear—ideal for visible joinery and display finishes
- Works in hot and cold climates—maintains flexibility without cracking
- No primer needed—bonds directly to metals, plastics, timber, masonry
- Safe for sensitive environments—non-toxic and low-VOC composition
Best Practices: Do's & Don'ts
Do
- Apply between 5°C and 40°C in a clean, dry environment
- Use masking tape for clean joint lines; tool off within 10 minutes
- Use open-cell backing rod to control joint depth and prevent 3-sided adhesion
- Prime porous substrates with Everflex Supaprime where required
- Perform adhesion testing for composite or unknown substrates
Don't
- Do not use for structural glazing or submerged joints (e.g., pools)
- Avoid use where movement exceeds ±50% of original joint width
- Do not enclose in a fully confined space—sealant requires humidity to cure
- Don’t apply on mirror, composite panel or natural stone without consultation
- Never clean with aggressive solvents or bleach-based products
Applications in Practice: Trade Scenarios
For Glaziers (On-Site Applicator): Timber Joinery Bedding
The Engineering Challenge
Glaziers working with timber sashes and cover strips need a sealant that adheres to timber and glass without yellowing, cracking, or requiring solvent cleanup.
The System-Based Solution with Allflex 101
Apply a thin bead of Allflex 101 to the glazing rebate. Press glass firmly, then run small 2–3mm beads for cover strip application. Product dries clear after application, simplifying aesthetic joinery work.
Best Practice Note
Tool sealant with a moistened spatula within 10 minutes. Use masking tape for clean lines and remove before skinning begins.
For Builders (Business Owner): Sealing Tilt Panels & Windows
The Engineering Challenge
Tilt-up panel joints and window reveals need flexibility and weather protection without staining adjacent surfaces or cracking over time.
The System-Based Solution with Allflex 101
Allflex 101 accommodates ±50% movement, ideal for precast or blockwork expansion joints. Its non-staining, UV-resistant formula adheres to concrete, brick, and powder-coated frames.
Best Practice Note
Use backing rod to ensure correct joint depth-to-width ratio (ideally 3:1). Prevent 3-sided adhesion by taping rear joint face if required.
Performance Benchmark: Allflex 101 vs. Standard Alternatives
| Metric | Allflex 101 | Standard Acrylic Sealant | Advantage |
|---|---|---|---|
| Movement Capability | ±50% Superior Flexibility | ±25% | Handles high-movement façades and glazing |
| Elongation at Break | 1000% Extreme Elasticity | 250–400% | Reduces risk of cohesive failure in dynamic joints |
| Cure Transparency | Dries Clear Aesthetic Finish | Opaque or white | Ideal for joinery and display surfaces |
Frequently Asked Questions
Can AllFlex 101 be used on polycarbonate roofing without causing discolouration?
Yes, AllFlex 101 is compatible with polycarbonate and acrylic plastics, and cures clear without staining or clouding. Its non-aggressive hybrid formula prevents discolouration or stress cracking, making it ideal for use on roof sheets, skylights, and signage panels.
What is the joint movement capability of AllFlex 101?
AllFlex 101 delivers an exceptional ±50% movement capability, double the industry standard. This makes it ideal for expansion joints, glazing frames, and substrates prone to thermal expansion or settlement, such as precast panels and weatherboards.
How long does AllFlex 101 take to cure fully?
AllFlex 101 forms a skin in approximately 10 minutes and cures at a rate of 2mm per day under typical conditions (25°C, 50% RH). Full cure may take 4–6 days depending on joint size, temperature, and substrate porosity. Avoid exposure to water until it cures clear.
Does AllFlex 101 require a primer for adhesion?
In most cases, no primer is required due to the sealant's excellent adhesion properties. However, for critical joints or high-stress substrates (e.g. anodised aluminium, glazed tiles), surface prep with Adheseal 50A or Everflex Supaprime may enhance performance.
Is AllFlex 101 paintable after curing?
Yes, once cured, AllFlex 101 can be overpainted with most water-based and acrylic paints. For best results, apply paint after the sealant has fully cured and turned clear. Always perform a compatibility test if using solvent-based coatings.
Can AllFlex 101 be used for underwater or submerged applications?
No, AllFlex 101 is not suitable for continuous water immersion. It should not be used in fish tanks, swimming pools, or submerged areas. For wet area waterproofing, consult Adheseal for alternative recommended systems.
Applications & Benefits
| Application / Use Case | Key Benefit | Primary Trades |
|---|---|---|
| Glazing Timber Joinery | Cures clear, strong adhesion to timber and glass, easy to tool and clean | Joiners, Glaziers |
| Precast & Tilt-Up Panel Sealing | ±50% flexibility absorbs movement without cohesive failure | Builders, Remedial Specialists |
| Weatherboard Panel & External Wall Joints | Paintable, non-staining finish that stays elastic over time | Carpenters, Builders |
| Polycarbonate Roofing & Skylights | Non-aggressive to plastics, excellent UV stability, no clouding | Roofers, Installers |
| Gap Filling & Bedding Around Doors & Windows | Low slump formula stays in place on vertical surfaces | All Trades |
| Alternative to Solvent-Based or Silicone Sealants | Non-toxic, isocyanate-free, water cleanup, low odour | Environmentally Conscious Installers |
Applying Allflex 101: Protocols & Best Practices
General Application Steps:- Preparation: Ensure the substrate is clean, dry, and prepared as per the Adhesion & Preparation Guide. Install backing rod where necessary. Mask joint edges for a clean finish.
- Application: Cut cartridge tip and nozzle at 45°. Gun the sealant with the nozzle angled forward, forcing material into the joint for full substrate contact.
- Tooling & Finishing: Tool within 10 minutes to form a smooth finish. Remove masking tape before skin forms. Avoid disturbing until fully cured.
- Curing: Protect from water during cure. Cure rate ~2mm/day, full cure in 4–6 days depending on conditions.
For Glaziers: Glazing Timber Windows
The Engineering Challenge: Achieving a clean, flexible bond between timber rebates and glazing panels without primer or yellowing over time.
The System-Based Solution with Allflex 101: Its hybrid acrylic chemistry provides strong initial grab and dries clear, ensuring a visually clean, permanently flexible finish ideal for joinery.
Best Practice Note: Apply small beads (~2–3mm), press cover strips while wet, and trim excess post-cure for sharp results.
For Builders: Sealing Precast Panel Joints
The Engineering Challenge: Managing thermal expansion and contraction in exposed vertical joints without failure or rework.
The System-Based Solution with Allflex 101: With ±50% movement and excellent adhesion to concrete and brick, it provides long-term performance without priming in most cases.
Best Practice Note: Use backing rod to ensure correct joint profile and depth ratio. Avoid three-sided adhesion by installing bond breaker tape.
Limitations & Safety
Product Limitations
Not suitable for permanent water immersion, such as in swimming pools or fish tanks. Use specialised waterproofing sealants instead.
Avoid in confined joints between two non-porous surfaces. Lack of atmospheric humidity will prevent proper curing.
Do not use for structural glazing or mirror fixing. Use Adheseal N-80 or High Power 609 instead.
Not recommended where abrasion or foot traffic is expected. Use mechanical expansion joint covers for trafficked areas.
May cause extended cure times in three-sided or deep joints. Always install a backing rod and prevent water contact during cure phase.
Safety & Handling Requirements
Personal Protective Equipment
Wear nitrile gloves, safety glasses, and long sleeves when handling. Use Adheseal Hand Wipes for safe skin cleaning. Wash hands before eating or smoking.
Ventilation Requirements
Use in well-ventilated areas. Do not apply in confined spaces without forced ventilation. Avoid vapour build-up during application in enclosed environments.
Fire & Handling Precautions
Keep away from heat and ignition sources. Store between 10°C–35°C in a cool, dry area. Dispose of empty cartridges in accordance with local waste regulations.
Emergency First Aid
Eyes:
Flush with clean water for at least 15 minutes. Seek medical attention immediately.
Skin:
Wash thoroughly with soap and water. Remove contaminated clothing.
Inhaled:
Move to fresh air. Seek medical attention if symptoms persist.
Swallowed:
Do not induce vomiting. Rinse mouth and seek medical advice immediately.
Seek medical attention immediately in all cases of serious exposure.
Applying AllFlex 101: Enhanced Protocols & Best Practices
-
Step 1: Surface Preparation
Ensure all surfaces are structurally sound, clean, dry, and free of dust, oil, release agents, or moisture. Surface preparation is critical to ensure proper adhesion.
Porous Substrates
Remove laitance or dust with a stiff brush. Prime with Everflex Supaprime for absorbent surfaces like concrete and masonry.
Non-Porous Surfaces
Clean with the two-cloth method using methylated spirits. Lightly abrade glossy or metallic finishes and treat with Adheseal 50A if needed.
Timing: Minimum 30 minutes dry time after priming before applying sealant.Pro Tip: Always perform adhesion testing on unknown or painted substrates to verify compatibility. -
Step 2: Joint Design & Masking
Design joint widths to accommodate expected movement. Use backer rod to control depth and prevent 3-sided adhesion. Mask edges with tape for neat lines.
Interior Joints
Min. 6mm width x 6mm depth. Avoid shallow joints for better performance and tooling finish.
Exterior Joints
Use a 10mm width x 10mm depth profile for weather-facing gaps. Insert foam rod 25% larger than joint width.
Timing: Complete masking before sealant installation to avoid contamination of surfaces.Pro Tip: Apply a polyethylene bond breaker tape on flat joints to avoid 3-sided bonding that leads to failure. -
Step 3: Application
Cut cartridge tip, attach nozzle, and insert into sealant gun. Hold at a 45° angle and push the bead into the joint, ensuring full contact without air entrapment.
Standard Bead Application
Apply a continuous 6–10mm bead depending on joint size. Ensure bead is even and consistent in width.
Glazing Installations
Apply thin bead to rebate. Insert glass. Add 2–3mm bead for cover strip adhesion.
Timing: Skin forms in approx. 10 minutes @ 25°C and 50% RH. Tool immediately after application.Pro Tip: Work in manageable sections and tool with a moistened spatula before skin formation. -
Step 4: Curing & Finishing
Allow the sealant to fully cure before exposing to water or painting. Protect from rain or condensation during the first 24 hours. Sealant will dry from white to clear.
Normal Conditions
Cures approx. 2mm per day at 25°C / 50% RH. Full cure in 4–6 days depending on bead size.
Low Humidity or Non-Porous Substrates
Allow extended cure time or use heaters/dehumidifiers to speed up evaporation-based curing system.
Timing: Avoid water exposure for at least 24 hours. Do not paint until sealant is fully cured and clear.Pro Tip: Clean tools immediately with water or Xylene before product skins. Use Adheseal Hand Wipes for skin contact cleanup.
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