3M Adhesive Sealant 540

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Description for 3M Adhesive Sealant 540

Polyurethane • Moisture cures rapidly to flexible seal/bond for many plastics, metal, wood, and more • 250 psi tensile strength

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Application Type	Adhesive, Seal
1 Part or 2 Part	1-Part
Material Form	Medium paste
Substrate	Acrylic, FRP, Fiberglass , Metal, Nylon 66, Plastic, Polycarbonate, Polypropylene, PVC, Cold rolled Steel, Fir, Stainless Steel, PolyEthylene, EPDM, ABS, Steel, Wood
Industry	Wire, Transportaion, Trains, Trucks, Two Wheel Vehicles, Commercial & Specialty Vehicles, Trailers
Manufacturer	3M
Chemistry	Methyl ethyl ketone (MEK), Polyurethane
Application Method	Spatula, Trowel
Cure Method	Moisture
Application Temperature (°F)	41 to 95
Cure Temperature (°C)	23
Cure Time (min)	1,440, Fast
Viscosity (cPs)	Non-sag
Color	Black, Gray, White
High Temperature Resistance (°C)	90
Low Temperature Resistance (°C)	-40

Best Practices for 3M Adhesive Sealant 540

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Technical Data for 3M Adhesive Sealant 540

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Overview

Application Type
- Adhesive
- Sealant - Seal
1 Part or 2 Part
- 1-Part
Material Form
- Paste - Medium paste
Substrate
- Glass - Fiberglass
- Metal
- Steel - Cold rolled Steel
- Plastic
- Acrylic (PMMA) - Acrylic
- Nylon - Nylon 66
- Polycarbonate
- Polypropylene
- Polyvinyl chloride (PVC) - PVC
- Polyethylene (LDPE, HDPE) - PolyEthylene
- ABS
- EPM/EPDM - EPDM
- Wood - Fir
- Composites - FRP
- Stainless Steel
- Other - SMC
Industry
- Transportation - Transportaion
- Rail - Trains
- Trucks
- Two Wheel Vehicles
- Commercial & Specialty Vehicles
- Trailer - Trailers
- Electronics - Wire
- Construction - Construction panels
Chemistry
- Other - Methyl ethyl ketone (MEK)
- Polyurethane
Application Method
- Dispenser - Application equipment
- Flow - Flow equipment
- Spatula/Trowel - Spatula, Trowel
Cure Method
- Moisture / Condensation Cure - Moisture
Color
- Black
- Gray
- White

Specifications

Cure Specs

Application Temperature (°F)	41 to 95
Cure Temperature (°C)	23	Test Method
Cure Time (min)	1,440, Fast	Test Method
Viscosity (cPs)	Non-sag
Tack Free Time (min)	60 to 90	Test Method

Bond Strength

Tensile Strength (psi)	High, 300	Test Method

Material Resistance

Non-Corrosive	Corrosion
UV Resistance	Good
High Temperature Resistance (°C)	90	Test Method
Low Temperature Resistance (°C)	-40	Test Method
Moisture/Humidity Resistance	Excellent water resistance

Hardness

Elasticity	Permanent elastic
Shore A Hardness	40	Test Method
Elongation (%)	>600	Test Method
Flexibility	Flexible
Modulus (psi)	Low, 125	Test Method

Other Properties

Specific Gravity	1.170
Flash Point (°F)	136.4
% Solids (%)	>90

Business Information

Shelf Life Details	Storage: Polyurethane sealants and adhesive sealants must be stored in a controlled environment to maximize shelf life. Store the products in the original unopened containers below 77°F (25C).;Shelf Life: When stored at recommended conditions, the shelf life is 6 months from date of shipment from 3M., Polyurethane sealants and adhesive sealants must be stored in a controlled environment to maximize shelf life. Store the products in the original unopened containers below 77°F (25C).;When stored at recommended conditions, the shelf life of cartridges and sausage packs is 12 months from the date of manufacture. For 5 and 55 gallon containers, the shelf life is 6 months from date of manufacture.
Shelf Life Temperature (°F)	<77 Room Temperature, <77 Room Temperature
Shelf Life Type	From date of manufacture, From date of manufacture
Shelf Life (mon)	12, 6

Best Practices for 3M Adhesive Sealant 540

*See Terms of Use Below
1. Surface Preparation
  
  Surfaces to be sealed or bonded should be clean and dry. Surfaces should be free from grease, mold release, oil, water/condensation, and other contaminates that may affect the adhesion of the sealant. Abrading with 180 to 220 grit abrasive followed by a solvent wipe will improve the bond strength. Suitable solvents include 3M™ Adhesive Remover or methyl ethyl ketone (MEK)*.
  
  *When using solvents, use in a well ventilated area. Extinguish all sources of ignition in the work area and observe product directions for use and precautionary measures.
2. Application
  
  Loading the applicator gun: make sure the applicator is set up with correct plunger attachment for cartridge or sausage pack.
  
  Cartridge: Puncture seal in nozzle and remove the pull-tab seal at the bottom of the cartridge. Load into applicator and fix retaining ring (if applicable). Assemble the nozzle (if applicable) and cut to desired size and shape.
  
  Sausage Pack: Make a 1" slit close to the crimp on one end of the sausage pack. Load the sausage pack into the applicator barrel (slit side out). Place the rounded end of the supplied sausage nozzle onto the slit end of the sausage package and fix with retaining ring. Cut nozzle to desired size and shape.
  
  Product should be used within 24 hours after seal is punctured. Dispense product with the nozzle tip in contact with the substrate to insure good gap filling. Bonding must occur within the first 50% of published skin time.
  
  Do not apply polyurethane sealants and adhesive sealants on frozen nor wet surfaces. Do not apply over silicone nor in the presence of curing silicone nor hybrid products. Avoid contact with alcohol and solvents during curing. Sealant can be tooled immediately after applying to give desired appearance.
3. Clean-Up
  
  While sealant is still soft, cleaning can be done with the same solvents used for surface preparation. Avoid cleaning with alcohol as it will interfere with the curing process. If sealant is already cured, removal is done mechanically with razor knife, piano wire, sanding or 3M™ Scotch-Brite™ Molding adhesive and Stripe Removal Disc.
Comparable Materials for 3M Adhesive Sealant 540

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Spec Engine^® Results
- Flex-221(Sika)
  A high-quality, multi purpose, non-sag, polyurethane sealant that cures on exposure to atmospheric humidity to form a durable elastomer. Bonds well to a wide variety of substrates
- Sikaflex-211 US(Sika)
  A multi-purpose 1-component polyurethane sealant that cures on exposure to atmospheric moisture. It bonds well to a wide variety of substrates and is suitable for making permenant elastic seals.
- 7100(Schnee-Morehead (ITW))
  A one component gun-grade, non-sag, moisture cure polyurethane sealant. This is high performance product is designed with outstanding UV resistance and long term durability with a proven record in tough climates around the world.
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