ADDITIVES | FLAME RETARDANTS
strategies in flame retardancy formulations. It says this is driving development of standards that go beyond the UL94-V0 classification towards a heat barrier that can enclose the thermal runaway of a battery for a certain time. Nabaltec says that since the first of January
2021, China, which is making big strides in electro- mobility, has already defined a new traction battery standard (GB 38031-2020) that demands a thermal propagation test. It requires that in the event of thermal runaway in an individual cell inside a Lithium-ion battery, there must be at least five minutes until thermal propagation leads to battery ignition or explosion. This will allow passengers enough time to escape an EV. According to Nabaltec, no final targets for a potential fire standard for battery enclosures currently exist outside of China, but substantial work is ongoing at OEMs and suppliers to develop them. “It is expected that new standards all around the world will be implemented to tackle this thermal propagation issue of the battery module in EVs,” it says. “Currently, aluminium metal-based housings are used for EV battery covers but the metal starts to
melt at 660°C and can break down very quickly. The challenge is to encapsulate the generated heat inside the battery and to improve the pressure strength of the battery housing,” Nabaltec says. The company’s Actilox HTB specialty filler blends
are developed for use in glass-fibre reinforced unsaturated polyester resins, PP or PA. Actilox HTB provides thermosets and thermoplastics with an integral heat barrier by ceramification of the polymer phase while maintaining a solid mechani- cal stability even after exposure times of 20 or 30 minutes to heat flux at 1,000°C, says Carsten Ihmels, Head of the Department R&D and Technical Service for Thermoset Applications. In lieu of a standard, Nabaltec developed a
screening test based on a torch test for its Actilox HTB ceramifying fillers. The torch test can be performed with either horizontal or vertical test specimens. In the case of a horizontally-oriented test specimen, weight can be added to the top of the specimen during the test to study the kinetics of the ceramification and simulate mechanical abrasion. The specimens were subjected to a propane/ butane torch flame at 1,650 Watts at 5cm distance
ENHANCED SOLUTIONS FOR AUTOMOTIVE IMERYS GRAPHITE & CARBON
Carbon based specialties for thermal and electrical conductivity and electromagnetic shielding.
C-THERM™ C-THERM™
| C-THERM™ PLUS HD
Low loading Formulation flexibility Improved processing
Contact us at
imerys.com MAX HD HIGH ASPECT RATIO GRAPHITE ENSACO® CONDUCTIVE CARBON BLACK
Low loading Easy dispersion Low moisture pick-up
TIMREX® GRAPHITE
High thermal conductivity High electrical conductivity Lubrication effect Superior purity
Page 1 |
Page 2 |
Page 3 |
Page 4 |
Page 5 |
Page 6 |
Page 7 |
Page 8 |
Page 9 |
Page 10 |
Page 11 |
Page 12 |
Page 13 |
Page 14 |
Page 15 |
Page 16 |
Page 17 |
Page 18 |
Page 19 |
Page 20 |
Page 21 |
Page 22 |
Page 23 |
Page 24 |
Page 25 |
Page 26 |
Page 27 |
Page 28 |
Page 29 |
Page 30 |
Page 31 |
Page 32 |
Page 33 |
Page 34 |
Page 35 |
Page 36 |
Page 37 |
Page 38 |
Page 39 |
Page 40 |
Page 41 |
Page 42 |
Page 43 |
Page 44 |
Page 45 |
Page 46 |
Page 47 |
Page 48 |
Page 49 |
Page 50 |
Page 51 |
Page 52 |
Page 53 |
Page 54 |
Page 55 |
Page 56
