Page 285 - Engineering Plastics Handbook

Liquid Crystal Polymer (LCP) 247

TABLE 11.5 Typical Grades of GF Filled LCPs
DTUL, °C
200 250 300 350
L304G35
SIVERAS ®
L204G35
E5008
SUMIKASUPER LCP ® E4008
E6008
E7008
S135
® B130 T130
VECTRA E130i
A130 C130
FC-110
®
XYDAR G-430
G-330 RC-210
7130
ZENITE ®
6130

®
SIVERAS can realize a much lower level of flash than other type II
LCPs on the market because of its low injection pressure due to its
excellent flowability.
®
3. Mechanical properties. SIVERAS has the highest level of mechani-
cal properties among all the commercial LCPs; in particular, it has
the highest weld strength, which is the most desired property of LCP
materials.

®
SIVERAS low-warpage grade
Although the anisotropic character of LCP can be suppressed by a higher
load of GF, the flowability that is the strong point of LCP is sacrificed by
the high load of GF as much as 50%. To avoid the loss of flowability, LCP
compositions contain shorter GF, or the combination of GF and other inor-
®
ganic fillers is developed and commercialized. SIVERAS low-warpage
grade L204M50 exhibits very small difference of mold shrinkage
between flow direction and the transverse direction, and it can actualize
the injection-molded articles with a very low level of warpage. In addition
to the low warpage, a higher level of flowability is desired in LCP because
small and complicated electronic parts should be molded with low injec-
®
tion pressure to avoid deformation. The characteristics of SIVERAS low-
warpage grades are shown in Table 11.6.

®
SIVERAS specialty filler grades
Recently, the application of LCP is expanding not only in the field of elec-
tric and electronics but also in the field of automobile and industrial