Precision #laserwelding of sensitive #electronic components depends on the effective transmission of #laser light. SABIC’s LNP™ EXL materials combine unique properties with high levels of near-infrared transmission for the laser welding of electronic control units, #actuators and #battery modules. Key properties of these filled and unfilled PC copolymers include flame retardance, #chemicalresistance and excellent impact.

1. Classification: General Business Use
LASER WELDING WITH LNP™ EXL
POLYCARBONATE COPOLYMER THERMOPLASTIC
Laser welding is a fast, affordable, vibration -
free joining technology used within the mobility
industry worldwide. Offering high precision,
laser welding is ideal for the reliable welding of
both simple and complex 3D geometries with
high throughput.
While the laser welding of polymers has been
demonstrated for many years, materials that
show a significant scattering of laser irradiation
pose challenges to the laser welding process.
The low transmission to the laser light can
cause inconsistencies in the weld, leading to
long cycle times and larger reject rates of the
final part. Where the materials contain additives
and fillers such as glass fiber, talcum or
inorganic flame retardants (FR), the attenuation
of the incident radiation reaching the laser
‘absorbing’ member is considerable. Hence,
filled, FR materials with good laser-weldability
are uncommon.
With increasing levels of electrification in today’s
world, the applications requiring filled and un-filled
FR solutions are growing. However, the
thermoplastic options available with the required
physical properties and high levels of laser
transmission are limited and restrict the options for
welding. SABIC’s LNP EXL resins are provided in
both filled and unfilled variants with non-
chlorinated, non-brominated UL94 FR packages
and provide a unique combination of features with
high levels of near infrared transmission.
LNP EXL resin is uniquely positioned to support the
assembly of applications such as electronic control
units (ECUs), actuators, battery modules and other
sensitive electronic equipment that require
vibration-free joining. LNP EXL resin offers
processability with excellent mechanical properties,
chemical resistance against a range of automotive
chemicals and high levels of laser transmission.
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LNP EXL resin is
available in a range of
opaque colors,
including black, while
retaining high levels
of laser transmission
LNP EXL resin is also
available in semi-
transparent options,
allowing the join
interface to be viewed
for on-line optical
characterization
LNP EXL resin offers benefits for the laser welding assembly of housings
or enclosures for batteries and sensitive electronic equipment such as
ECUs and actuators.
Laser transmission
980 nm (%)
Comparative laser transmission data
PROPERTY
FR PBT/PET
resin
LEXAN™
EXL5689
resin
LEXAN
EXL9330
resin
Expt.
LNP
resin
15% GF 9% GF unfilled
10-30%
GF
Flammability
UL94
V0
(mm)
1.5 1.5 1.5 0.4 – 1.5
Flexural
modulus
ISO 178
(MPa)
5400 3400 2200
4000-
8000
Notched IZOD
impact (23°C)
ISO 180
(kJ/m2
)
6 25 70 10-20
Heat deflection
temperature
ISO 75,
1.8 MPa
(°C)
185* 132 124 126-139
Laser
transmission
980 nm
(%)
7 58 64 55-80
LNP EXLresin properties compared to FR PBT/PET resin
* ASTM D 648

2. Classification: General Business Use
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CONTACT DETAILS:
AMERICAS
SABIC Americas
2500 City West Boulevard
Suite 100
Houston, TX 77042
USA T +1 7134302301
ASIA PACIFIC
SABIC Shanghai
2550 Xiupu Road, Pudong
Shanhai 201319
China
T +86 21 2037 8188
EUROPE
SABIC Bergen op Zoom
Plasticslaan 1
4612 PX Bergen op Zoom
The Netherlands
T +31 164 292 911
LNP™ COPOLYMERS LNP COPOLYMERS LNP COPOLYMERS
Nithin Raikar
nithin.raikar@sabic.com
Huazhen Yao
huazhen.yao@sabic.com
Tony Farrell
Tony.farrell@sabic.com
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