3M Aerospace3M™ Scotch-Weld™ Advanced Liquid Shim EC-7272 B/A
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
3
Stress out ofTake the
Aero-Structures
As the demand for aircraft reaches new heights, the pressure is on suppliers to develop
solutions that increase manufacturing productivity without compromising performance.
3M™ Scotch-Weld™ Advanced Liquid Shim EC-7272 B/AFor 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,
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
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.
Technical Properties
• Fills gaps up to 3mm
• Shore D hardness of 82 after 4 hours at room temperature*
• Superior fatigue resistance
• Non sag in vertical applications
• Excellent chemical and environmental resistance
• Easy injectable application
• Extrudable from duo-pack cartridges for easy and
accurate mixing
Shimming ProcessesShimming materials are required to fill small gaps in rib-to-skin
and other load-bearing aero-structure applications in order to
reduce stress and premature fatigue cracking of the assembly.
Aside from the costly and complex management of hundreds of
bespoke sizes, traditional hard shims are time-consuming and
labour-intensive to apply.
Dispensing Equipment3M Scotch-Weld Advanced Liquid Shim EC-7272 B/A can be dispensed manually and pneumatically using the following equipment.
Storage DetailsStore at room temperature. Shelf life is 6 months from date of shipment in the original unopened containers.
to PerformDesigned
* 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.
1 2 4 6 12
Hours
Shor
e D
Hard
ness
90
85
80
75
70
65
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.
Condition 1: 23 °C ± 2 °C, 50 % ± 5 % relative humidity
Condition 2: 30 °C ± 2 °C, 50 % ± 5 % relative humidity
Duo-Pak Cartridge Size Manual Dispenser Pneumatic Dispenser Preferred Nozzle
50ml3M™ Scotch-Weld™ EPX Manual
Dispenser ll 50mlNot Applicable
3M™ Scotch-Weld™ EPX Structural Adhesive Nozzle 7 Element
200ml3M™ Performance Manual
Applicator 081173M™ Performance Pneumatic
Applicator 099303M™ Static Mixing Nozzle 08193
400ml Not Applicable3M™ Scotch-Weld™ EPX Pneumatic
Applicator3M™ Static Mixing Nozzle 08193
3M™ Scotch-Weld™ EPX Manual Dispenser II 50ml
3M™ Performance Manual Applicator 08117
3M™ Performance Pneumatic Applicator 09930
3M™ Scotch-Weld™ EPX Pneumatic Applicator
3M™ Static Mixing Nozzle 08193
3M™ Scotch-Weld™ EPX Structural Adhesive Nozzle 7
Element
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.
Aerospace and Commercial Transportation Division 3M United Kingdom plc3M CentreCain Road, BracknellBerkshire RG12 8HTTel: +44 (0) 845 604 6395 www.3M.co.uk/aerospace
3M Ireland LimitedThe Iveagh BuildingThe Park, CarrickminesDublin 18Tel: 00 353 1 280 3555 Fax: 00 353 1 280 3509
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.
3M and Scotch-Weld are trademarks of 3M CompanyPlease recycle. Printed in the United Kingdom.© 3M 2014. All rights reserved.03M87543