Weber HP 3A – Hybrid Polymer-Based High-Modulus Joint Sealant and Adhesive
Weber HP 3A
Weber HP 3A is a high-performance sealant based on hybrid polymer technology and formulated as a single-component product. It provides excellent performance for high-modulus joint sealing and bonding applications. Thanks to its UV resistance, solvent-free formulation, and resistance to harsh weather conditions, it can be safely used in both interior and exterior environments.
Product Description
Weber HP 3A is a hybrid polymer-based, single-component, UV-resistant, high-modulus, solvent-free joint sealing and waterproofing sealant as well as an adhesive.
Advantages
- Provides excellent adhesion
- Resistant to severe joint movement
- Can be applied on damp surfaces
- Does not shrink or lose volume
- Environmentally friendly
- Free from solvents and isocyanates
- Resistant to UV rays and chemicals
Areas of Use
Weber HP 3A is suitable for the following applications:
- Horizontal and vertical joints requiring high sag resistance
- Precast element joints
- Connections and assembly details of prefabricated building components
- Roof and terrace expansion joints
- Parapet corner joints
- Wall, floor, window, and door perimeters
- Interior wet areas such as bathrooms, kitchens, shower cabins, washbasins, sinks, and countertop joints
The product is odorless, environmentally friendly, mold-resistant, and highly resistant to challenging weather conditions.
Suitable Substrates
- Concrete, precast concrete, fiber-reinforced concrete, and cement boards
- Wood, metal, and aluminum
- Brick, ceramic, and marble
- Glass and galvanized steel sheets
- Plastic surfaces
For applications on other substrates, professional consultation is recommended.
Surface Preparation
- Joints must be dry, clean, and free from contaminants.
- Glass and metal surfaces should be free from coatings; if necessary, clean with cellulosic thinner.
- Metal surfaces should be treated with an anti-corrosion primer.
- Masking tape may be used to achieve sharp and clean joint edges.
Application Conditions
- Surface and ambient temperature: +5°C to +35°C
- Do not apply in excessively hot or humid conditions.
- Do not apply on frozen surfaces or where there is a risk of freezing.
Application Instructions
- Apply the sealant so that it fully contacts both sides of the joint and the polyethylene backer rod.
- Apply in a single layer; do not overlap applications.
- Smooth the surface and remove any trapped air bubbles.
- The surface may be finished using soapy water.
- Remove masking tape before the product cures.
- Moisture is required for curing; therefore, it should not be used in completely enclosed environments.
- Clean tools with alcohol immediately after use.
Application Tools
Consumption Table
| Joint Size (mm) | Consumption (ml/m) | Coverage with 600 ml Sausage (m) |
|---|
| 10 × 10 | 100 | 6.0 |
| 15 × 10 | 150 | 3.9 |
| 20 × 10 | 200 | 3.0 |
| 25 × 12 | 300 | 2.0 |
| 30 × 15 | 450 | 1.3 |
Warnings and Recommendations
- A polyethylene backer rod should be installed at the base of the joint.
- Adheres to many smooth construction materials without primer; testing is recommended on absorbent, glossy, or painted surfaces.
- Joint width should generally be approximately twice the joint depth.
- The product can be painted; however, paint may crack if joint movement occurs.
- Wear protective gloves and safety goggles during application.
- Not suitable for applications exposed to continuous water immersion.
Packaging and Storage
- Net weight: 936 g ± 3% sausage
- Gross volume: 600 ml ± 3% sausage
- Storage conditions: Store in a dry, moisture-free environment at +5°C to +25°C
- Shelf life: 1 year in unopened original packaging
Technical Properties
| Property | Value |
| Chemical Base | Hybrid Polymer |
| Color | White, Grey |
| Density | 1.58 ± 0.03 g/cm³ |
| Tensile Strength at Break | ≥ 1.80 MPa |
| Elongation at Break | ≥ 250% |
| Application Temperature | +5°C to +35°C |
| Service Temperature | -40°C to +90°C |
| Shore Hardness | 45–55 Shore A |
Safety Precautions
- Wear a mask, gloves, and safety goggles during application.
- Avoid contact with eyes and skin.
- In case of eye contact, rinse immediately with plenty of water and seek medical advice.
- Refer to the Safety Data Sheet (SDS) for disposal and safety information.
Frequently Asked Questions
Where can Weber HP 3A be used?
It is suitable for horizontal and vertical joints, precast connections, prefabricated construction details, roof and terrace expansion joints, parapet corners, door and window perimeters, and wet-area joints in interior spaces.
Which surfaces can it be applied to?
It can be applied to concrete, fiber-reinforced concrete, metal, brick, ceramic, marble, glass, galvanized steel, and plastic surfaces.
Does it contain solvents?
No. Weber HP 3A is solvent-free and isocyanate-free, making it environmentally friendly.
Can the product be painted?
Yes. However, paint may crack if joint movement occurs, so testing before application is recommended.
What is required for curing?
Moisture is required for curing. Therefore, it should not be used in completely enclosed or airtight environments.