LORD 7545 Two-Component Urethane Adhesive System

LORD® 7545

LORD® 7545 is an equal-mix, two-component urethane adhesive system for structural bonding of FRP, SMC, plastics, primed metals, and dissimilar substrates. It uses a 1:1 mix ratio by volume, offers curative options from 1.5 to 65 minutes working time, and reaches full strength in 24 hours at 75°F (24°C). Its non-sag bead profile and cured resistance to weathering, humidity, salt spray, and many solvents support bonded assemblies exposed to mixed-material interfaces, vertical joints, and service stress.

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Typical values only. Working time and handling strength depend on the selected curative.

Key Features

• 1:1 mix ratio by volume across the series to help simplify meter, mix, and cartridge setup.
• Working-time options from 1.5 to 65 minutes to help align adhesive selection with assembly takt time.
• Non-sag paste rheology to help maintain bead placement on vertical and overhead joints.
• 100% solids mixed system to help maintain bondline fill without solvent loss during cure.
• Cured resistance to weathering, humidity, salt spray, solvents, and most paint-shop cleaning steps.

Processing Summary

• Use within the 6-month shelf life.
• Store unopened material at or below 25°C.
• Use FIFO to maintain inventory turnover.
• No pre-treatment or degas is required.

• Remove grease, dirt, loose debris, and processing fluids.
• For plastics, use a dry rag wipe or solvent-dampened rag.
• For metals, prime or grit blast, then solvent wash for optimum bond performance.
• Plasma treatment can help on hard-to-bond materials in special cases.

• Use PTFE-lined hoses, 300 series stainless wetted metal parts, and PTFE-based seals.
• Use a compatible flouroelastomer stator for progressive cavity equipment.
• Use at least 20 static mixer elements for 50 mL cartridges and 24 elements for 200 mL or MMD dispense.
• Do not manually agitate before transfer. Manual mixing can entrain air and disturb mix ratio.

• Dispense within working time. Discard material once working time is exceeded.
• Perform ratio checks at least once per day or at the start of each shift. Flag deviations greater than ±5%.
• Level cartridge plungers before attaching the mixer tip.
• When switching within the same base chemistry, purge 3 times the MMD line volume. For different base chemistries, perform a full wetted-parts teardown.

Test specimen and failure mode notes

CFRP: 2x2 twill in epoxy resin matrix, 3 mm thick. ABS: 5 mm thick. PC/ABS: 5 mm thick. E-coated steel: 1008 steel, 8 mm thick, coated with PPG E6060C.

Failure mode abbreviations: ADH = adhesive failure, COH = cohesive failure, SF = stock failure.

Storage and handling

Shelf life is six months from date of shipment when stored in a clean, dry environment at 65 to 85°F (18 to 30°C) in the original, unopened container. After opening, protect material from moisture exposure by using desiccant cartridges and/or dry nitrogen as an inert cover. In the application note, unopened material is also recommended to be stored at or below 25°C and managed with FIFO.

• 50 mL cartridges
• 200 mL cartridges
• 5 gallon pails
• 55 gallon drums

• Match curative selection to working time, handling strength, and part size.
• Review equipment compatibility for PTFE, stainless, seals, and stator materials.
• Confirm surface prep, static mixer length, and ratio-check method for your line.
• Support purge strategy and changeover planning for cartridge or MMD dispense.

Share your substrates, target bondline, required working time, and environmental exposure profile. We’ll fine-tune surface prep, dispense parameters, and clamp strategy to meet strength and appearance goals.