EC-3532 B/A

Description

The 3M Scotch-Weld EC-3532-B/A is trusted across the aviation industry by MRO teams and aircraft engineers working on everything from the most advanced military aircraft to commercial passenger fleets carrying millions of passengers each year. This two-part structural urethane adhesive delivers proven strength, flexibility and durability for bonding metals, composites and plastics under demanding operational conditions. Its convenient 4-oz (118 mL) kit format reduces waste, speeds up AOG response and ensures consistent results in both line maintenance and heavy checks. Engineers choose it because it has a long-standing track record of OEM acceptance, reliability in critical repairs and is supported worldwide by 3M’s aerospace-grade quality.
Key Technical Specs for 3M SCOTCH-WELD-EC-3532-B/A
Mix ratio: by weight 100 : 109 (Base : Accelerator). By volume 100 : 100.
Viscosity (typical): Base ~10,000–55,000 cps (Brookfield @24°C); Accelerator ~15,000–40,000 cps (Brookfield).
Work life / pot life: ~5–15 minutes for 100 g mixed at 75°F (24°C).
Time to full cure: ~24 hours at 75°F (24°C) (heat accelerates cure).
Non-sag: becomes non-sag approximately 30 seconds after mixing (useful for fillets/vertical joints).
Shear/strength data: example overlap shear to etched 2024 T-3 aluminum (0.005″ bondline). ~2,200 psi at 75°F, ~2,500 psi at −40°F, but drops to ~300 psi at 180°F (82°C). Polycarbonate overlap shear ~700 psi (75°F).
Temperature performance: retains toughness and low-temperature flexibility, but shear strength decreases markedly at elevated temperatures.
Approvals & Specifications for 3M SCOTCH-WELD-EC-3532-B/A

Surface prep: abrade (e.g., 240 grit) and solvent wipe (MEK, MIBK or acetone) for best results. For maximum water/humidity/salt spray resistance, 3M EC-3901 structural adhesive primer is recommended on metal surfaces.
Application methods: spatula/trowel, manual dispensing from kits or two-part metering/mixing equipment and cartridges for production/repair work.
Bondline control: typical test data used a .005″ bondline for structural repairs follow OEM/repair-station procedures for bondline and cure schedules.
Typical Aircraft MRO / AOG Applications for 3M SCOTCH-WELD-EC-3532-B/A
Common uses: structural bonding and repair of secondary structures, bonding dissimilar substrates (metal-composite, metal-plastic), fillets and impact-resistant joints in airframe maintenance and component repairs. Its non-sag, impact resistance and cured flexibility make it popular for bonded repairs and assemblies.
Limitations: significant loss of lap shear strength at elevated temperatures (example: ~300 psi at 180°F), so not suitable where sustained high temperatures are expected (consult OEM for engine-zone use or hot surfaces). Also: adhesives are subject to OEM/airline/engine OEM repair acceptance. Always confirm approval in the applicable SRM/IPC/repair manual or get engineering authorization before use on certified repairs.
Compatibility & Safety Notes for 3M SCOTCH-WELD-EC-3532-B/A

Compatibility: Bonds well to primed/painted metal and many plastics/composites when surfaces are abraded and solvent-wiped; 3M recommends the EC-3901 structural adhesive primer where improved corrosion/resistance is needed. For critical or flight-critical repairs always confirm surface prep & primer per the TDS and OEM SRM.
Safety: Read the current SDS for Part A and Part B (3M SDSs available as PDFs). The SDS lists hazards including skin sensitization and reproductive toxicity for some components — use appropriate PPE (gloves, eye protection), local extraction/ventilation, and follow waste/disposal rules. Keep SDSs on file in the shop and include hazards in AOG/toolbox briefs.
Packaging & Procurement for 3M SCOTCH-WELD-EC-3532-B/A (matched to the Aerospheres page and common market packs)
Aerospheres lists the item: 3M SCOTCH-WELD-EC-3532-B/A with 4-oz (118 mL) kit quantity shown and expiry date visible on the page.
Order using Aerospheres’ product code or Boeing Distribution part numbers depending on your procurement flow. Expect shelf-life and batch/lot traceability info on the carton and a TDS/SDS PDF link from the supplier.
Why 3M SCOTCH-WELD-EC-3532-B/A is Chosen for AOG / MRO
Engineers and MROs choose: EC-3532 B/A because it combines structural strength, impact toughness and non-sag behaviour in a small kit that’s readily usable during urgent repairs.
The short work life and room-temp cure allow quick local repairs and fast returns to service when engineering approvals permit bonded repairs, making it a high-value consumable for AOG events and routine shop repairs.
Practical Suggestions for Your Team (AOG mindset) for 3M SCOTCH-WELD-EC-3532-B/A
Stock at least one 4-oz (118 mL) kit per shift and a spare kit in the AOG locker for immediate issue.
Keep the TDS and SDS (Part A & B) printed/online in your engineering and stores folders and attach lot number + expiry to the job card.
Use small metered/dispensing equipment for consistency on recurring repairs and reserve manual kits for one-off AOG fixes. Control mix ratio and bondline thickness per TDS.
For corrosion-sensitive fittings, use 3M EC-3901 primer per TDS recommendations.
Manufacture / Aviation Spec Codes for 3M SCOTCH-WELD-EC-3532-B/A
Manufacturer: 3M Aerospace & Aircraft Maintenance Division
Manufacturer Product Code / ID: EC-3532 B/A (two-part kit)
ECCN (Export Control Classification Number): EAR99 (per Boeing Distribution listings)
Quality Standard: Manufactured under AS9100 aerospace quality management system (3M Aerospace)
Aerospace Declarations: Listed on 3M’s Aerospace Declarable Substance List (AD-DSL)
OEM / Distributor References: Listed in Boeing Distribution Services catalogue (formerly Aviall), with multiple packaging options (e.g., 48.5 mL cartridge, 4-oz kit)