Stress Aero-Structures out of Take the

3M Aerospace
3M Scotch-Weld Advanced Liquid Shim EC-7272 B/A
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Take the
Stress out of
Aero-Structures
Optimise shimming processes with a new high-strength,
fast-curing, injectable liquid shim:
• Fill gaps up to 3mm
• Cures to drilling strength within 4-5 hours at room temperature
• Superior fatigue resistance
• Non sag in vertical applications
• Easy and accurate injection application
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Shore D hardness was determined according to ISO 868 in two conditions
using 50 g of mixed material on a disc of 70 mm diameter and 10 mm height.
Technical Properties
• Fills gaps up to 3mm
• Shore D hardness of 82 after 4 hours at room temperature*
to Perform
• Superior fatigue resistance
• Non sag in vertical applications
• Excellent chemical and environmental resistance
Shore D Hardness
Designed
90
• Easy injectable application
• E xtrudable from duo-pack cartridges for easy and
85
80
75
70
65
124 612
accurate mixing
Hours
Condition 1: 23 °C ± 2 °C, 50 % ± 5 % relative humidity
Condition 2: 30 °C ± 2 °C, 50 % ± 5 % relative humidity
As the demand for aircraft reaches new heights, the pressure is on suppliers to develop
solutions that increase manufacturing productivity without compromising performance.
Dispensing Equipment
3M Scotch-Weld Advanced Liquid Shim EC-7272 B/A can be dispensed manually and pneumatically
using the following equipment.
Shimming Processes
Duo-Pak Cartridge Size
Manual Dispenser
Pneumatic Dispenser
Preferred Nozzle
50ml
3M Scotch-Weld EPX Manual
Dispenser ll 50ml
Not Applicable
3M Scotch-Weld EPX Structural
Adhesive Nozzle 7 Element
200ml
3M Performance Manual
Applicator 08117
3M Performance Pneumatic
Applicator 09930
3M Static Mixing Nozzle 08193
400ml
Not Applicable
3M Scotch-Weld EPX Pneumatic
Applicator
3M Static Mixing Nozzle 08193
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Shimming materials are required to fill small gaps in rib-to-skin
and other load-bearing aero-structure applications in order to
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reduce stress and premature fatigue cracking of the assembly.
Shimming materials are required in load-bearing applications and structures
designed to have flexibility, such as fixed wings, in order to prevent premature
fatigue cracking and increase fatigue resistance of the part.
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Aside from the costly and complex management of hundreds of
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bespoke sizes, traditional hard shims are time-consuming and
labour-intensive to apply.
3M Scotch-Weld Advanced Liquid Shim EC-7272 B/A
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3M Scotch-Weld EPX Manual
Dispenser II 50ml
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3M Performance Manual
Applicator 08117
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3M Performance Pneumatic
Applicator 09930
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3M Scotch-Weld EPX Pneumatic
Applicator
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3M Static Mixing Nozzle
08193
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For the last 6 years, 3M Aerospace has been engineering a sophisticated epoxy-based liquid shim that offers superior structural gap filling properties
up to 3mm, thereby significantly reducing the need for hard shims. 3M Scotch-Weld Advanced Liquid Shim EC-7272 B/A is a single, injectable,
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fast-curing solution designed to deliver an increase in productivity and overall cost reduction.
Curing to drilling strength* within 4-5 hours at room temperature without excessive exothermicity, Scotch-Weld EC-7272 B/A combines excellent
Storage Details
Store at room temperature. Shelf life is 6 months from date of shipment in the original unopened containers.
toughness and high compressive strength while increasing production throughput. The rheology of the liquid shim has been specifically engineered to
balance the need for precise and fast injection with minimal slump thereby enabling application versatility.
* Shore D hardness of 82 achieved after 4 hours at 23 °C ± 2 °C, 50 % ± 5 % relative humidity.
The test was conducted using 50 g of mixed material on a disc of 70 mm diameter and 10 mm height and was determined according to ISO 868.
3M Scotch-Weld EPX
Structural Adhesive Nozzle 7
Element
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Product Use: Many factors beyond 3M’s control and uniquely within user’s knowledge and control can affect the use and performance of a 3M product in a particular application. Given the
variety of factors that can affect the use and performance of a 3M product, user is solely responsible for evaluating the 3M product and determining whether it is fit for a particular purpose
and suitable for user’s method of application.
Aerospace and Commercial Transportation Division
3M United Kingdom plc
3M Centre
Cain Road, Bracknell
Berkshire RG12 8HT
Tel: +44 (0) 845 604 6395
www.3M.co.uk/aerospace
3M Ireland Limited
The Iveagh Building
The Park, Carrickmines
Dublin 18
Tel: 00 353 1 280 3555
Fax: 00 353 1 280 3509
3M and Scotch-Weld are trademarks of 3M Company
Please recycle. Printed in the United Kingdom.
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