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For high-strength structural bonding in automotive, aviation, and marine applications, Selsil Plastic Welding MMA provides rapid-curing adhesion on rigid substrates. This methylmethacrylate adhesive creates structural bonds across dissimilar materials, including hard plastics, fiberglass, ceramics, and metals, resisting both chemical exposure and water contact once fully cured.
Chemical bonding mechanism
Plastic Welding MMA is a two-component reactive system formulated for high-strength adhesion on rigid surfaces. The 1:1 mix ratio initiates a rapid chemical cure that achieves excellent adhesion on difficult-to-bond hard plastics. Because the formulation is highly resistant to water and chemical degradation, the cured bond maintains its structural integrity in demanding automotive engine bays, marine hulls, and industrial assembly environments.
Numbers that matter
- 5 to 6 minutes working time: Your active window to mix, apply, and align parts before the adhesive begins to skin and cross-link.
- 10 to 12 minutes set time: Rapid initial green strength (temperature dependent) to hold components in alignment without prolonged clamping.
- 1:1 mix ratio: Equal parts resin and hardener, automatically metered through the double-piston syringe to ensure consistent cure strength and prevent uncured soft spots.
Where to use it
- Rigid plastics: ABS, fiberglass, PVC, vinyl, FRP, acrylic, styrene, and SMC.
- Rigid non-plastics: China tile, ceramic, wood, concrete, stone, and glass.
- Trade applications: General purpose assembly, automotive trim and structural panel repairs, marine component bonding, and aviation interior installations.
Limitations
- Unsuitable substrates: Do not use on PE (polyethylene) or PP (polypropylene), as the adhesive cannot wet out or chemical-bond to these low-surface-energy plastics.
- Temperature sensitivity: High temperatures accelerate the 5 to 6 minute working time, while cold temperatures extend the 10 to 12 minute set time.
How to apply
Surfaces must be clean, dry, and free from oil, wax, and paint. Always roughen smooth substrates with abrasive media to create a mechanical key before application. Remove the plug from between the pistons, cut the syringe tips, and turn the syringe tip-up; pull the plunger back slightly to let trapped air bubbles rise to the top. Depress the double piston to dispense equal parts of Component A and Component B onto a disposable mixing surface. Thoroughly hand-mix the resin and hardener for one minute before applying. Wipe the syringe tips clean, retract the piston slightly to prevent cross-contamination, and seal with the plug, ensuring the plug is in its original orientation.
Frequently asked questions
What plastics does Selsil Plastic Welding MMA bond to?
It forms strong bonds to ABS, acrylic (PMMA), polycarbonate, fibreglass (GRP), and rigid PVC. It is not suitable for PE, PP, PTFE, or silicone rubber.
Do I need a dispensing gun for this adhesive?
No, a dispensing gun is not required. The product comes in a 28g syringe with a static mixer tip, allowing direct application by hand.
How much working time does this adhesive offer?
You have 3–6 minutes of working time at 23°C to position parts before the adhesive begins to gel. Handling strength is reached in 10–12 minutes.
Can this adhesive be used outdoors or in marine settings?
Yes, once cured, the bond is resistant to moisture, UV radiation, vibration, and salt exposure. It is suitable for marine, exterior signage, and vehicle repairs.
Applications and benefits
| Application | Key benefit | Primary trades |
|---|---|---|
| Repairing cracked ABS or polycarbonate vehicle trims | Fast 10–12 minute handling strength, often without clamps, and suitable for common automotive plastics. | Auto body repairers, Mechanics |
| Bonding signage panels (acrylic to metal) | High UV resistance and impact toughness suitable for exterior and exposed conditions. | Signmakers, Installers |
| Marine trim and fibreglass (GRP) housing assembly | Moisture and salt-resistant bond for reliable performance in marine environments. | Marine fit-out specialists, Boatbuilders |
| Plastic-to-metal component assembly in field repairs | Compact syringe format with integrated mixer allows tool-free application for mobile technicians. | Mobile technicians, Maintenance crews |
| Structural bonding of plastic brackets or enclosures | High tensile (≥ 17 MPa) and shear (≥ 16 MPa) strength delivers robust structural integrity with minimal surface preparation. | OEM assemblers, Product repair technicians |
How to Use Selsil Plastic Welding MMA
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Step 1: Surface Preparation
Clean all bonding surfaces thoroughly. Remove dirt, oil, grease, and surface oxidation. For best results, lightly abrade glossy plastics and metals, then clean with isopropyl alcohol.
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Step 2: Open and Attach Nozzle
Twist off the syringe cap. Attach the static mixing nozzle (provided) to ensure even 1:1 mixing of both adhesive components during application.
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Step 3: Apply the Adhesive
Push down on the syringe plunger to dispense the adhesive onto one surface. Apply a uniform bead and bring parts together immediately.
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Step 4: Assemble & Hold
Align parts precisely and hold for 10–12 minutes until initial cure. Clamping is only required for heavy or misaligned components.
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Step 5: Final Cure
Allow 24 hours for full cure at room temperature. Avoid heavy loads or exposure to water during this period.
Product limitations
- Not for: Low surface energy plastics such as polyethylene (PE), polypropylene (PP), or PTFE (Teflon). It is also not recommended for silicone rubber or elastomers.
- Application conditions: Do not apply to dirty, oily, or wet surfaces. Proper surface preparation is essential for bond integrity.
- Temperature: Avoid prolonged service exposure above 120°C once fully cured.
Safety and handling
Personal protective equipment
Wear safety glasses and chemical-resistant gloves during use.
Ventilation
Use in a well-ventilated area to minimise inhalation of fumes.
First aid
- Eye Contact: Rinse immediately with plenty of water for 15 minutes. Seek medical help.
- Skin Contact: Wash with soap and water. Remove contaminated clothing.
- Inhalation: Move to fresh air. Get medical attention if symptoms occur.
- Ingestion: Do not induce vomiting. Rinse mouth and consult a doctor immediately.
Storage and disposal
Keep the syringe sealed and store in a cool, dry area between 5–25°C. Keep away from ignition sources. Unopened, the product has a shelf life of 12 months. Dispose of unused material and packaging according to local regulations.
Substrate guide
Proper surface preparation is critical for durable bonds. This guide outlines requirements for common substrates.
ABS and polycarbonate
Surface prep: Ensure surfaces are clean, dry, and free from mould release agents, oils, and oxidation. Abrade with fine grit sandpaper and wipe with isopropyl alcohol for best adhesion.
Primer: Not required. Selsil Plastic Welding MMA adheres strongly to these substrates without a primer.
Acrylic (PMMA)
Surface prep: Remove any surface stress or oxidation. Sand with fine grit and clean with a suitable solvent. Surfaces must be smooth and dry before bonding.
Primer: Not required. This adhesive bonds well to PMMA under standard conditions.
Rigid PVC and vinyl
Surface prep: Wipe with a PVC-safe cleaner or isopropyl alcohol to remove plasticisers. Light abrasion may improve adhesion on aged or gloss-finished PVC.
Primer: Optional. For flexible vinyls or PVC with high plasticiser content, an adhesion activator, such as Adheseal Vinyl Activator, is recommended or test adhesion strength prior to full use.
Fibreglass (FRP)
Surface prep: Sand with 120–180 grit sandpaper to remove gelcoat and roughen the bonding surface. Clean thoroughly with acetone or isopropyl alcohol. Ensure no moisture is present.
Primer: Not required. This adhesive bonds directly to sanded fibreglass laminates.
Metal (aluminium, mild steel)
Surface prep: Degrease with acetone. Abrade with 80–120 grit sandpaper to create a mechanical key. Clean again and ensure the surface is dry and free of rust or oxide layers.
Primer: Required for critical applications. Use Adheseal Metal Primer 601 for maximum bond reliability on bare metals or in high-load applications.
Selsil Plastic Welding MMA Physical Properties
| Property | Value |
|---|---|
| Base Chemistry | Methyl Methacrylate |
| Material Type | Two-Part Methacrylate Adhesive (MMA) |
| Colour | Off-white |
| Tensile Strength | >= 17 MPa |
| Shear Strength | >= 16 MPa |
| Shore Hardness | Shore D 70–75 |
| Pot Life | 3–6 minutes @ 23°C |
| Initial Cure | 10–12 minutes |
| Full Cure | 24 hours @ 23°C |
| Application Temperature | +5°C to +35°C |
| Service Temperature | -40°C to +120°C (continuous) |
| Mix Ratio | 1:1 by volume |
| Maximum Gap Fill | Up to 3 mm |
| Standards | Türkiye |
| Packaging | 28 g syringe (1:1 dual-chamber with mixer tip), Carton of 12 |
| Shelf Life | 12 months (unopened, Stored below 25°C) |
| Storage Conditions | Cool, dry area, away from ignition sources |
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