LORD 7542 Urethane Adhesive System - Thin Viscosity, Flowable with Configurable Set-Time & high strength for FRP, SMC, Plastics, primed metals, powder coating

Product Name

LORD 7542 Urethane Adhesive System - Thin Viscosity, Flowable with Configurable Set-Time & high strength for FRP, SMC, Plastics, primed metals, powder coating

Brief Description

LORD 7542 is an equal-mix, two-component urethane adhesive system characterized by its thin viscosity and flowable nature. It is engineered to provide high-strength, structural bonds for a diverse range of substrates, including fiber-reinforced plastics (FRP), sheet molding compound (SMC), various other plastics, and primed metals. This adhesive system offers configurable set-times to accommodate different process requirements and demonstrates excellent resistance to environmental factors and chemicals.

Popular Applications & Uses

- Bonding of FRP (fiber-reinforced plastics) and SMC (sheet molding compound/fiberglass) components.- Adhering various other types of plastics.- Bonding primed metals and powder-coated parts.- Fabrication of LED channel letters.- Bonding of ACM (Aluminum Composite Material) panels.- Construction of sign frames and cabinets.- Applications in vibration-prone or exterior signage.- Backside reinforcement and repair of plastic components, particularly in automotive applications.- Bonding industrial and marine composites.

Industries that Commonly Use It

- Automotive Service/Repair- Fabrication- General Manufacturing- Marine- Metal Fabrication- Plastic Fabrication- Sign & Display- Transportation/ Specialty Vehicle

Special and Unique Features

- Two-component, equal-mix urethane adhesive system.- Thin viscosity and flowable for easy application.- Configurable set-time, allowing for a range of working times by selecting different curatives.- Provides high strength for demanding structural bonding applications.- Non-flammable, eliminating the need for explosion-proof equipment.- Environmentally recommended, as it does not contain ozone-depleting chemicals.- Highly resistant to environmental factors including weathering, humidity, salt spray, and sunlight.- Chemically resistant, maintaining bond strength even when exposed to solvents after curing, and unaffected by most painting and cleaning processes.- UL 746C certified.- Can be applied using handheld cartridges or automatic meter/mix/dispense equipment.

Key Properties

- Adhesive Type: Two-component urethane adhesive.- Mix Ratio: 1:1 by volume (Resin to Curative).- Solids Content: 100% by weight.- Working Time: Varies depending on the curative used; for example, 4 to 7 minutes at 75°F (24°C) for some variants, and approximately 5-10 minutes for 7542AB.- Handling Time: Typically 1-2 hours at 75°F (24°C).- Full Cure Time: Achieves full strength in 24 hours or less at 75°F (24°C), depending on the curative.- Viscosity: Thin and flowable. Specific viscosity ranges for the resin and curatives are detailed in technical datasheets (e.g., Resin: 1500-4500 cP; Curatives: 4000-14000 cP).- Flash Point: >200°F (>93°C) Closed Cup.- Optimum Bondline Thickness: 10-40 mil (254-1016 micron).- Shelf Life: Six months when stored in a clean, dry environment at 65-85°F (18-30°C) in original, unopened containers.

Surface Compatibility

- FRP (Fiber-Reinforced Plastics)- SMC (Sheet Molding Compound / Fiberglass)- Other Plastics- Primed Metals- Powder Coated Parts- Rubber- Composites

Known backups / known substitutes

- Other two-part urethane adhesives with similar performance characteristics, such as 3M™ SMC/Fiberglass Repair Adhesives or Norton SpeedGrip SMC/FRP Fiberglass Urethane Adhesive.- Acrylic adhesives, including LORD 403/19, LORD 406/19, and Maxlok series (e.g., MX/T3, MX/T6, MX/T18, Signlok 810), which are often used as structural bonding alternatives.- Epoxy adhesives, which can also be found in products like 3M™ SMC/Fiberglass Repair Adhesives.- Other urethane adhesive systems from LORD, such as LORD 7550AC or LORD 7610.

Comparison Note

When considering alternative or substitute adhesive systems, it is essential to conduct a thorough comparison of specific performance attributes. Key factors to evaluate include working time, full cure time, viscosity, ultimate bond strength, flexibility, resistance to environmental conditions (e.g., temperature, humidity, chemicals), and compatibility with the precise substrates and application methods of the project. Always refer to the technical data sheets of potential alternatives and perform appropriate testing to ensure the chosen adhesive meets all specific application requirements.