Page 286 - Engineering Plastics Handbook

248 Engineering Plastics

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TABLE 11.6 Characteristics of SIVERAS Low-Warpage Grades
L204G35 L204M50 L204M35

Unit Standard Low warpage
Specific gravity 1.68 1.84 1.69
Tensile strength MPa 145 130 125
Elongation % 3.0 2.6 3.0
Flexural strength MPa 190 170 175
Flexural modulus GPa 14.0 16.5 13.7
Izod impact strength J/m 70 60 75
DTUL (18.2 MPa) °C 250 250 245
Flammability UL-94 V-0 V-0 V-0
Mold shrinkage (MD) % 0.06 0.20 0.18
Mold shrinkage (TD) % 0.50 0.29 0.32
Flowability (0.5 mmt) mm 74 65 90

machinery. To fit the desires of the new fields, many new special grades
of LCP are being developed that contain various highly functional fillers.
Both fibrous and granular functional fillers can be used. Examples of typ-
ical fibrous fillers are carbon fibers, rockwool fibers, potassium titanate
whiskers or metal fibers, as well as the granular fillers, talc, mica, kaolin,
silica, clay, glass beads, glass micro balloons, and carbon black. SIVERAS ®
has several specialty grades such as high-stiffness grade, antiabrastion
grade, and antistatic grade other than the regular GF or filler grades
shown in Fig. 11.5.

®
SIVERAS new grade with
highest weld strength
Toray recently succeeded in developing a new series of LCP with vastly
improved weld strength and toughness, which have been problems of LCP
that needed to be solved for a long time [19]. The new lineup of LCP was
developed by using our own polymer nanotechnology consisting of precise
molecular design, nanoscale control of molecular mobility and molecular

Standard Grade Specialty Grade

L204G35J High-strength grade
High flow/low warpage added
High stiffness/ High
antiabrasion filler Antistatic
L204G35H (excellent flowability) L204M35 (low warpage) L204A35 L204M50 L204G50EC
Heat resistance added (for lead-free soldering) Heat resistance added

L304G35H (excellent flowability) L304M35 (low warpage) L304A35 L304M50
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Figure 11.5 Variation of SIVERAS grades.