September 2016

3M™ SA9816 Two Part Epoxy Adhesive
Automotive Structural Adhesive
Data Sheet
Description
3M™ Automotive Two-Part Epoxy Adhesive SA9816 is formulated forgalvanised steel or aluminium hem flange bonding applications involving very
high draw lubricant coating weights with good induction reactivity, an importantfactor in achieving fast lock-up.
The adhesive can also offer a special feature of compatibility with dry film
lubricants used on aluminum surfaces. It is particularly important that theadhesive has a long dwell time capability before E-coat bake. 3M™ SA9816 canoffer the following additional features; low activation temperatures to minimize
panel distortion, broad off-ratio and over-bake tolerance, spot cure capability,
and structural bond strength, on as-received (draw lubricated) steel andaluminium.
This product facilitates geo-setting of automotive panels assemblies in the body
construction facility, hence can offer the opportunity to eliminate the need for
Body-in-White ovens and additional fixturing outside of the hemming cell
Product Construction
This is a 2-component structural adhesive dispensed in the ratio of 4:1 byvolume. Typical forms of packaging available for the product with both bulk andcartridge formats. Bulk application is typically by robotic applicator using adoser to accurately dispense the 2 component adhesive through a static ordynamic mixing nozzle. The product is also suitable for hand held cartridge
application.

Technical Data Sheet
3M™ SA9816 Two Part Epoxy Adhesive2

Physical Properties
ColourSolids(%)
Density

Part A (accelerator)
Light brown
100
1.04

Part B (base)black1000.88

Mixedblack100
0.91

Handling and Processing
Storage
Recommended Conditions:Transported and stored at average adhesivetemperatures between 10°C and 30°C

Shelf Life* (minimum)
Part A (accelerator)
Part B (base)
6 months
6 months

The shelf life as defined above remains indicative and maximum data, subject to external and non-controllable
factors. It may not be interpreted as a warranty.

Dispensing
Mix ratio B:A• By weight• By volume
Off Ratio Tolerance• By weight• By volume
Open time (at 23°C)(maximum time from application tojoint closure)mixed adhesive
3.45 B :1.0 A
4.00 B: 1.0 A
3.14 B – 3.83 B: 1.0A (±10% of A)
3.64 B – 4.44 B: 1.0A (±10% of A)
120 minutes (this should be reduced for highertemperatures)

Curing:Curing:
3M SA9816 has a two stage curing mechanism. Initial strength is achieved by either room temperature curing
over a few hours or accelerated by induction curing; final strength is achieved through E-coat-bakeRoom Temperature Cure:
Cure:
Strength Build-Up at Room Temperature (23°C): time to handling strength

Technical Data Sheet
3M™ SA9816 Two Part Epoxy Adhesive

3This strength build up curve was developed using a 3M Test Procedure. The strength of the adhesive ismeasured by a regular small deflection on a shear sample this test uses the same sample throughout theduration of the test. At regular intervals the sample is pulled 0.25mm then returned to the starting position.
In our experience comparing automotive panel handling strength with the results achieved in this test,
good panel handling strength is achieved at around 200N in this test or 2h-3h at 23°C for 3M 9816.
Higher temperatures will accelerate, and lower temperatures will reduce the rate of strength build-up.
Although there is a significant level of strength build up at room temperature and with induction, finalstructural strength is achieved during E-coat bake. Typical strengths after minimum and maximum E-coatbake cycles are shown in the following data.

Performance Data
6111 Aluminium, Siloxane Conversion Coating with dry-film lubricant (0.93mm)
Over-Lap Shear (SAE J1523)
Exposure

Over-Lap Shear Strength (MPa)(mean average of min/max bake)
Min bakeMax bakeRoom Temperature (23°C)
Elevated Temperature (82°C)
Low Temperature (-40°C)
2000hr Salt-Spray (ASTM B117)
Cyclic Corrosion (30 cycles)*****
*****

15.5
6.0
16.6

20.8
8.5
22.2
14.9

13.7

19.5

Failure Mode
(Cohesive/Adhesive/Substrate)

Cohesive
Cohesive
Cohesive
Cohesive
Cohesive

15 minute salt water immersion (5% salt solution)
1 h and 45 minute drip dry at 23 +/- 2 °C
22 h at 50 +/- 2 °C and 90 +/- 5% RH

Peel Resistance (ASTM D1876)
Exposure

Room Temperature (23°C)

Over-Lap Shear Strength (N/25mm)(mean average of min/max bake)

Average Plateau Load: 70.8

Failure Mode
(Cohesive/Adhesive/Substrate)

Cohesive

Galvanized Steel with stamping oil (0.8mm)
Over-Lap Shear (SAE J1523)
Exposure

Over-Lap Shear Strength (MPa)(mean average of min/max bake)
Min bake
Max bake

Room Temperature (23°C)
Elevated Temperature (82°C)
Low Temperature (-40°C)
500hr Salt-Spray (ASTM B117)
Cyclic Corrosion (30 cycles)*****
*****

16.69
10.54
20.26
12.77
12.79

16.79
6.53
20.45
13.85
14.41

Failure Mode
(Cohesive/Adhesive/Substrate)

Cohesive
Cohesive
Cohesive
Cohesive
Cohesive

15 minute salt water immersion (5% salt solution)
1 h and 45 minute drip dry at 23 +/- 2 °C
22 h at 50 +/- 2 °C and 90 +/- 5% RH

Peel Resistance (ASTM D1876)
Exposure

Room Temperature (23°C)

Over-Lap Shear Strength (N/25mm)(mean average of min/max bake)

Average Plateau Load: 280

Failure Mode
(Cohesive/Adhesive/Substrate)

Cohesive

Technical Data Sheet
3M™ SA9816 Two Part Epoxy Adhesive

4Health and Safety Information: Read all Health Hazard, Precautionary, and First Aid statements found in the Material
Safety Data Sheets and/or product label prior to handling or use. Material Safety Data Sheet for this product is available fromwww.3m.co.uk/msds
Technical Information: The technical information, recommendations and other statements contained in this document are
based upon tests or experience that 3M believes are reliable, but the accuracy or completeness of such information is notguaranteed.
Product Use: Many factors beyond 3M’s control and uniquely within user’s knowledge and control can affect the use andperformance 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 andsuitable for user’s method of application.
Warranty, Limited Remedy, and Disclaimer: This 3M product is sold or made available “AS IS.” 3M MAKES NO OTHERWARRANTIES OR CONDITIONS, EXPRESS OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, ANY IMPLIED WARRANTY ORCONDITION OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE OR ANY IMPLIED WARRANTY ORCONDITION ARISING OUT OF A COURSE OF DEALING, CUSTOM OR USAGE OF TRADE.
Limitation of Liability: Except where prohibited by law, 3M will not be liable for any loss or damage arising from the 3M product,whether direct, indirect, special, incidental or consequential, regardless of the legal theory asserted, including warranty, contract,negligence or strict liability.

Automotive Division
3M United Kingdom PLC
3M Centre
Cain Road
Bracknell
RG12 8HT
www.3M.co.uk

SA9816
Issue date: September 2016
Revision: JK02
3M is a trademark of 3M Company© 3M 2016. All rights reserved.