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For sealing interior and exterior expansion joints subject to movement, Everflex JS Hybrid Acrylic Sealant provides a low-modulus barrier that withstands weathering without cracking. This water-based joint sealer adheres to most building materials without priming and accommodates significant thermal and structural movement in both hot and cold climates.
Everflex JS Hybrid Acrylic Sealant fills moving joints across key construction substrates, including precast panels, blockwork, brickwork, and window frames. As a low-modulus sealant, it exerts low stress on the bond line, allowing the joint to expand and contract. Its hybrid acrylic formulation resists sagging in wide joints and tools to a smooth surface. The cured sealant is paintable, contains no isocyanates, and is non-staining.
Everflex JS Hybrid Acrylic Sealant is suitable for joints in the following areas and substrates:
Ensure all joint surfaces are clean, sound, dry, and free of dirt, grease, laitance, and loose particles. For suspect surfaces, perform adhesion testing prior to full application.
Insert Adhefoam open-cell or closed-cell backer rod to control the sealant depth and prevent three-sided adhesion. Where the joint depth is too shallow for a backer rod, apply a bond-breaker tape. Tool the sealant immediately after application with a spatula to a flat, non-concave finish.
For joints requiring a fire rating, use Fire-Foam backer rod in accordance with its specific technical data sheet.
Everflex JS is engineered for high movement joints, accommodating up to +/- 50% of the original joint width. This exceeds typical building practice allowance of +/- 25%, providing extra flexibility in dynamic applications.
Do not apply Everflex JS if rain is expected within 90 minutes. As a water-based sealant, rain before sufficient skin formation can cause washouts. Ensure backer rod is protected from water absorption during the initial cure.
Priming is generally not required for most substrates due to its superior adhesion. However, for any suspect surfaces, an adhesion test is recommended to confirm suitability.
Yes, Everflex JS can be part of a fire-rated joint system. Use it with FireFoam backer rod as specified in the Fire-Foam data sheet to achieve fire resistance.
| Application | Key benefit | Primary trades |
|---|---|---|
| Precast and tilt-up panel joints | Manages significant structural movement with +/- 50% capability, resisting cracking and adhesion loss in varying temperatures (-18°C to 80°C). | Concreters, Facade installers, Builders |
| Window and door frame perimeter sealing | Ensures a durable, weather-resistant seal that accommodates building movement and UV exposure, preventing leaks and maintaining integrity. | Glaziers, Window and door installers, Carpenters |
| Blockwork and brickwork expansion joints | Provides flexible, non-staining sealing for masonry, accommodating thermal expansion and contraction without compromise. | Bricklayers, Block layers, Landscapers |
| Timber and metal panel joints | Offers superior, primer-free adhesion to diverse materials, delivering a paintable finish for aesthetic integration and long-term protection. | Carpenters, Metal fabricators, Shopfitters |
| Sealing various plastics (e.g., Acrylic, Polycarbonate) | Maintains strong adhesion and elasticity on common plastic substrates, reducing the risk of joint failure due to material flex or temperature shifts. | Signwriters, Glaziers, Shopfitters |
A successful joint starts with proper preparation. All surfaces must be completely clean, sound, dry, and free from contaminants like dust, grease, laitance, or loose material that could prevent a solid bond.
Ensure backer rod or bond breaker tape is installed to achieve the correct sealant depth (6mm to 10mm). Apply Everflex JS with steady pressure, ensuring the sealant fills the joint and makes full contact with the sides.
Tool the sealant off immediately after application using a spatula. Push the sealant into the joint to ensure good wet-out and a solid contact area. Aim for a flat or slightly convex finish.
Warning: Causes skin irritation. Causes serious eye irritation. May cause respiratory irritation. Harmful if swallowed.
Wear protective gloves and safety glasses. Suitable gloves should be used for intermittent contact. Always wash hands before eating, drinking, or smoking.
Ensure ventilation is adequate to maintain air concentrations below occupational exposure standards. Use only in well-ventilated areas and avoid generating dusts.
Store in a cool, dry, well-ventilated place, out of direct sunlight, between 5°C and 32°C. Keep containers upright and closed when not in use. Store away from foodstuffs and incompatible materials. This material is a Schedule 5 poison and must be stored, maintained, and used according to relevant regulations. Dispose of product as prescribed waste in accordance with state and local regulations.
Proper substrate preparation is critical for the long-term performance of Everflex JS, ensuring optimal adhesion and joint integrity.
Surface prep: Surfaces must be clean, sound, and free from dirt, grease, laitance, loose particles, or other contaminants. This ensures a strong, uniform bond.
Primer: Not required. Everflex JS offers superior adhesion without priming for these common substrates. However, adhesion testing is recommended for any substrate where bond strength is uncertain.
Surface prep: Ensure all plastic surfaces are thoroughly cleaned and degreased. Remove any protective films or mould release agents that may compromise adhesion.
Primer: Not required. Everflex JS is formulated to adhere effectively to many plastics without additional priming. For critical or unfamiliar plastic types, conduct an adhesion test.
| Property | Value |
|---|---|
| Product Type | Hybrid Acrylic |
| Density | 1.06 (specific gravity) |
| Elongation | 100% |
| Service Temperature | -18°C to 80°C |
| Movement Capability | +/- 50% |
| Low Temp Flexibility | No cracking or adhesion loss (ASTM C-734) |
| UV Accelerated Weathering | No cracking or adhesion loss (ASTM C-732) |
| Form | Paste |
| Colour | Grey |
| Odour | Acrylic odour |
| Solubility | Miscible with water |
| Specific Gravity | 1.0 - 1.1 Kg / Lt |
| Boiling Point Range | >100 °C |
| Shelf Life | Minimum 12 months |
| Hazard Rating Health | 1 (Slight) |
| Hazard Rating Flammability | 1 (Slight) |
| Hazard Rating Reactivity | 0 (Minimal) |
Here are some common examples on where Everflex JS Hybrid Acrylic Sealant used by our customers.
