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3MTM DyneonTM Fluoroelastomers
Improved performance in AdBlue® systems at high temperatures.
Fluoroelastomers for SCR systems.
Why AdBlue® technology?In the past few years there has been a continuous flow of innovations and regulations aimed at reducing the emissions from the cars of today and the future and making them cleaner than they have ever been before.
EURO 5 emission standards required diesel engines to have nitrogen oxide (NOx) emissions no higher than 180 mg/km. These targets could be reached by “just” increasing the efficiency of the engine.
Diesel engines are 20% more energy efficient than petrol engines, resulting in lower fuel consumption (approx. 20%) and lower carbon dioxide (CO2) emissions (approx. 15%).
This makes diesel engines an important factor for the implementation of European climate protection targets – despite the fact that NOx emissions from diesel engines are several times higher than those of petrol engines.The current emission standard in Europe (EURO 6) challenges the automo-tive industry with respect to CO2, particle, hydrocarbon, and NOx emissions.
All newly registered cars have had to meet EURO 6 emission standards since September 2015. EURO 6 reduced the NOx target emission value to 80 mg/km, which is now only one third higher than those of petrol engines.These values call for different measures to reach the targets. One preferred way to achieve EURO 6 is additional treatment of the exhaust emissions by using selective catalytic reduction (SCR) technology, known in Europe under the AdBlue brand.
Introduction
What is SCR technology?The approach is based on a chemical reaction, mechanically triggered by injecting an aqueous solution of 32.5% urea into the exhaust pipe.
The solution reacts with the NOx, and chemically reduces it to nitrogen and water (steam) in a process known as selective catalytic reduction (SCR).
In Europe this SCR solution is known as AdBlue technology.
AdBlue Technology
ENGINE ELECTRONICCONTROL UNIT
ENGINE
SCR
Diesel particle filter
Catalytic convertor
Ureum splitter + gas mixing
Level sensor
Temp sensor
Injector
Tankheating
NOx SensorTemp sensors
The AdBlue® system.
Supporting the transition to cleaner diesel engines with fluoroelastomer (FKM) from 3M.New substances in the automotive environment mean new challenges for the materials involved. This refers to the containment system as well as the seals used.
Generally, urea solutions are not a challenge for traditional sealing materials. However, in the newer SCR systems wider temperature ranges (low as well as high) and possible cross contamination present new challenges. Conse-quently, traditional sealing materials may no longer be suitable.
In order to make the system safe for users under almost all circumstances, the system has to be resistant to cross-contamination caused by fuels and lubricants that may be put into the SCR system by mistake. It is a well-known fact that EPDM sealing materials swell when they come into contact with fuels and oils and this can cause the seal to fail.
Bearing in mind the huge differences in temperatures in the different regions of the world where a vehicle might be operated during its lifetime, other alternatives such as HNBR might not be right the material of choice.
This is where 3M™ Dyneon™ Fluoroelastomers come into the picture. Using different monomers and monomer ratios, a number of products are available for different low temperature applications while maintaining the other advantages of FKM such as high temperature and chemical resistance.
Standard FKM used in automotive applications will not perform adequately as it tends to swell in urea solutions at elevated temperatures.
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Chemical Resistance
Resistance of Dyneon FKM to AdBlue®.
A traditional approach to the problem has been to lower the level of or even omit the acid acceptor in order to improve the chemical resistance of PO-cura-ble fluoroelastomers. With respect to AdBlue, the elimination of the acid acceptor has shown a signifi-cant improvement and a reduction of the volume swell.
However, the swell still remains at a high level. Only when using Dyneon’s proprietary, patented technolo-gy does the swell remain at a level where the per-formance and reliability of the seal is not negatively affected.
* Manufactured using Dyneon patented technology for improved resistance towards AdBlue.** Test conditions: 504 h/80 °C*** Test conditions: 336 h/85 °C
FPO 3730(-13°)**
(Acid acc. ZnO)
FPO 3731(-13°)**
special*
FPO 3730(-13°)**
No AA
LTFE 6320Z(-30°)**
(Acid acc. ZnO)
LTFE 6320Z(-30°)**
special*
LTFE 6320Z(-30°)**
No AA
LTFE 6400(-40°)***
ZnO
E-19788(-40°)***
special*
The following grades are currently available:3M™ Dyneon™ Fluoroelastomer FPO 3731 (TR-10 = -6 °C; fully commercial) and E-19788 (TR-10 = -40 °C; experimental stage)
Other grades using this technology are available upon request.
AdBlue is a trademark of VDA (Verband der deutschen Automobilindustrie), a German Car Manufacturers’ Association.
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Technical Information and Test Data
Technical information, test data, and advice provided by Dyneon personnel are based on information and tests we believe are relia-ble and are intended for persons with knowledge and technical skills sufficient to analyse test types and conditions, and to handle and use raw polymers and related compounding ingredients. No license under any Dyneon or third party intellectual rights is grant-ed or implied by virtue of this information.
General recommendations on health and safety in processing, on work hygiene and on measures to be taken in the event of acci-dent are detailed in our material safety data sheets.
You will find further notes on the safe handling of fluoropoly- mers in the brochure “Guide for the safe handling of Fluoro- polymers Resins” by PlasticsEurope, Box 3, B-1160 Brussels, Tel. +32 (2) 676 17 32.
The present edition replaces all previous versions. Please make sure and inquire if in doubt whether you have the latest edition.
Important Notice
All information set forth herein is based on our present state of knowledge and is intended to provide general notes regarding products and their uses. It should not therefore be construed as a guarantee of specific properties of the products described or their suitability for a particular application. Because conditions of pro-duct use are outside Dyneon’s control and vary widely, user must evaluate and determine whether a Dyneon product will be suita-ble for user’s intended application before using it. The quality of our products is warranted under our General Terms and Condi-tions of Sale as now are or hereafter may be in force.
Dyneon is a 3M company.Dyneon is a trademark of 3M.09/2016 All rights reserved.© Dyneon 2016 | ADBL201609EN
Dyneon GmbH3M Advanced Materials DivisionCarl-Schurz-Straße 141453 NeussPhone: +49 (0) 2131 14 22 65Fax: +49 (0) 2131 14 38 57www.dyneon.de
Technical Service Fluoroelastomers 3M Belgium BVBA/SPRL3M Advanced Materials DivisionHaven 1005, Canadastraat 112070 ZwijndrechtBelgiumPhone: +32 (0) 3 250 78 68Fax: +32 (0) 3 250 79 04
Dyneon Customer Service EuropePhone: 00 800 395 366 27Fax: 00 800 396 366 39ItalyPhone: 800 791 018Fax: 800 781 019
3M Advanced Materials Division6744 33rd Street NorthOakdale, MN 55128USAPhone: +1 800 810 8499Fax: +1 800 635 8051
Where to go for more information?
