3M 1945 B/A

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Description for 3M 1945 B/A

Chemically curing, corrosion resistant primer to improve adhesion of urethanes and epoxies to many metals. Increases corrosion protection. Cures at room temperature.

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Application Type	Primer
1 Part or 2 Part	2 Part
Material Form	Liquid
Substrate	Metal, Urethanes
Manufacturer	3M
Chemistry	Amine cured epoxy in a blended ketone solvent
Cure Method	Base/Accelerator
Cure Temperature (°C)	20 to 25, 21 to 27, 21 to 27, 21 to 27, 82, 121
Cure Time (min)	>60, 1,440, 60, 30, 5.00
Color	Green
Density (g/cm³)	10.6 to 11.1 (weight (lbs/gal)), 6.8 to 7.2 (weight (lbs/gal))
Can Be Used In Conjunction With These Materials	Urethanes, Epoxies

Best Practices for 3M 1945 B/A

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Technical Data for 3M 1945 B/A

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Overview

Application Type
- Primer
1 Part or 2 Part
- 1 Part or 2 Part - 2 Part
- Part A Name - Base
- Part B Name - Accelerator
Material Form
- Liquid
Substrate
- Metal
- Polyurethane - Urethanes
- Other - Epoxies
Chemistry
- Epoxy - Amine cured epoxy in a blended ketone solvent
Application Method
- Brush - Brushing
- Spray - Spraying
- Dip - Dipping
Cure Method
- 2-Part Cure - Base/Accelerator
Color
- Green
Can Be Used In Conjunction With These Materials
- Epoxies
- Urethanes

Specifications

Cure Specs

Cure Temperature (°C)	20 to 25, 21 to 27, 21 to 27, 21 to 27, 82, 121
Cure Time (min)	>60, 1,440, 60, 30, 5.00
Work / Pot Time (min)	<480	Test Method
Mix Ratio	1:1 (by volume)

Bond Strength

Structural/Load-Bearing	Structural

Material Resistance

Non-Corrosive	Corrosion protection

Other Properties

% Solids (%)	61 to 65, 4.6 to 2.4	Test Method
Density (g/cm³)	10.6 to 11.1 (weight (lbs/gal)), 6.8 to 7.2 (weight (lbs/gal))

Business Information

Shelf Life Details	Storage: Store product at 80°F or less for maximum shelf life. Rotate stock so that the oldest shipments are always used first.;Shelf Life: Standard shelf life for 3M™ Scotch-Weld™ Structural Adhesive Primer EC-1945 B/A is 12 months from date of shipment when stored at 80°F or lower.
Shelf Life Temperature (°F)	<80
Shelf Life Type	from date of shipment
Shelf Life (mon)	12

Best Practices for 3M 1945 B/A

*See Terms of Use Below
1. Surface Preparation
  
  Substrates must be clean, dry and free of oil, grease, release agents or other contaminants. Substrates such as aluminum can be cleaned satisfactorily using clean dry rags or unsized, lint-free cheese cloth that has been soaked in common cleaners* such as called out in MIL-C-38736.
2. Application
  
  3M™ Scotch-Weld™ Structural Adhesive Primer EC-1945 B/A can be applied by dipping, brushing or spraying. For optimum results, Scotch-Weld Primer EC-1945 B/A should be applied to a dry film thickness of 0.2-0.7 mils (0.0002-0.0007 inches).
3. Mixing
  
  Thoroughly mix the base and accelerator at a one to one (1:1) volume ratio. Scotch-Weld Primer EC-1945 B/A, at 77 ± 2°F in a sealed container, has an application life of approximately 8 hours. (Periodic agitation is necessary.)
4. Curing
  
  Scotch-Weld Primer EC-1945 B/A is an amine cured epoxy in a blended ketone solvent. The primer must contain no solvent prior to the application of the adhesive or sealer. A minimum of 60 minutes @ 75° ± 5°F is the suggested drying time prior to adhesive or sealer application. Higher temperatures will reduce this drying time and the following is the suggested cure cycles. (a) 24 hours @ 75° ± 5°F (b) 1 hour @ 75° ± 5°F followed by 30 minutes @ 180°F or 5 min. @ 250°F.
  
  Note: Cure cycle (b) is the suggested cure to provide maximum toughness and corrosion protection of the primer.
5. Clean-Up
  
  All containers, tools and equipment normally re-used in handling this product should be cleaned before the product has an opportunity to set up or cure. This can be done easily with conventional organic solvents such as methyl ethyl ketone.* Cured Scotch-Weld Primer EC-1945 B/A can be removed by soaking in a methylene chloride type stripper.*
  
  *Note: When using solvents, be sure to follow the manufacturer’s precautions and directions for use for handling such materials.
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