LORD Signlok 403 Extra Fast Setting 2-4 minute Non-Sag Temperature Resistant MMA Adhesive

Product Name

LORD Signlok 403 Extra Fast Setting 2-4 minute Non-Sag Temperature Resistant MMA Adhesive

Brief Description

LORD Signlok 403 is a two-component, extra fast-curing, high-strength Methyl Methacrylate (MMA) adhesive system. It is engineered for structural bonding of a wide range of metals and engineered plastics, offering rapid handling strength. This adhesive is specifically formulated to replace traditional mechanical fastening methods such as welding, brazing, and riveting.

Popular Applications & Uses

- Channel letter assembly- Sign box and corner key bonding- Metal frame construction- ACM and substrate panel installation- Replacement for welding, brazing, and riveting in signage and architectural applications- Bonding dissimilar materials like metal to plastic or composites- Structural bonding in automotive, aerospace, and marine industries- Bonding composite flooring to wood floors in vehicles- Bonding aluminum composite panels to buildings

Industries that Commonly Use It

- Sign & Display- Metal Fabrication- Plastic Fabrication- General Manufacturing- Transportation/ Specialty Vehicle (including automotive, heavy trucks, rail, buses, agricultural, construction machinery)- Aerospace/Defense- Marine- Construction/ Building Services

Special and Unique Features

- Extra fast cure time: Offers a working time of 2-4 minutes and handling strength in just 4-6 minutes- Non-sag formula: Maintains position when applied on vertical or overhead surfaces, providing greater process flexibility- Temperature resistant: Performs reliably in temperatures ranging from -40°F to +300°F (-40°C to +149°C)- Glass bead reinforcement: Ensures precise bondline control and minimizes adhesive waste- Environmentally resistant: Resists weathering, moisture, salt spray, dilute acids, oils, and solvents- UL 746C Recognized / UL 879 certified: Approved for sign assemblies, enhancing safety and reliability- Replaces traditional mechanical fastening methods like welding, brazing, and riveting- Bonds a wide range of unprepared metals and engineered plastics with minimal substrate preparation- Provides high impact and peel strengths

Key Properties

- Adhesive Type: Two-component Methyl Methacrylate (MMA) / Acrylic Adhesive- Work Time: 2-4 minutes- Handling Strength: 4-6 minutes- Full Cure Time: 24 hours (achieves 90% strength in 2 hours)- Mix Ratio: 2:1 (adhesive to accelerator by volume)- Color (Mixed): Tan- Lap Shear Strength (Steel): 2,300 psi (15.86 MPa)- Peel Strength (Aluminum): 20-23 pli (3.5-4.0 N/mm)- Operating Temperature: -40°F to +300°F (-40°C to +149°C)- Shelf Life: 18 months (when stored in original, unopened container below 80°F / 27°C)- Viscosity: Non-sag

Surface Compatibility

- Metals (prepared or unprepared)- Engineered thermoplastics including XENOY®, polycarbonate, ABS, and acrylics- Composites- Fiberglass- Wood (in certain applications)- Can bond dissimilar materials effectively- Tolerant of minor surface contamination like mill oils and drawing compounds- Requires minimal surface preparation

Known backups / known substitutes

- Other LORD Signlok series adhesives, such as Signlok 406, 810, and 7550, which offer varying work and handling times- Other Methyl Methacrylate (MMA) adhesives from manufacturers like 3M, ASI, Infinity Bond, LOCTITE, Plexus, SCIGRIP, Sika, Huntsman, Permabond, Forgeway, and H.B. Fuller- Epoxy adhesives, though MMAs often provide higher peel strength, better temperature resistance, and faster strength development- Polyurethane adhesives- Cyanoacrylate (instant) adhesives- Traditional mechanical fastening methods like welding, brazing, riveting, and screws

Comparison Note

LORD Signlok 403 is distinguished by its extra fast setting time (2-4 minutes work time) and rapid handling strength (4-6 minutes), making it highly efficient for high-throughput assembly environments. It delivers high mechanical performance, excellent temperature resistance, and environmental durability, often outperforming epoxies in terms of peel strength and speed of strength development. The non-sag formula and integrated glass bead reinforcement ensure precise application and consistent bondline control, which is particularly advantageous for vertical or overhead applications and achieving aesthetically pleasing assemblies.