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LL
6301 grades are medium density LDPE grades, with a relatively high molecular
weight. Compared to LDPE grades of equivalent density, LL 6301 grades
exhibit a higher heat
deflection temperature and a significantly greater resistance to long term
creep.The relatively high molecular weight of the LL 6301 grades means that
molded articles are very tough and exhibit excellent environmental stress
cracking resistance. LL 6301 grades have excellent mechanical
properties and some applications which have taken advantage of these
properties are threaded closures, caps, houseware and technical parts.
The superior properties of LL 6301 grades make it ideal grades to substitute
lower melt make it ideal grades to substitute lower melt index, low density
resins and still significant improvement in properties such as ESCR,
gloss and stiffness. Another outstanding feature is that articles molded
from LL 6101 grades exhibit very low warpage.
The intrinsically high stiffness of LL 6301 grades offers the advantage of
material savings by downgauging wall thickness whilst retaining top load
strength. The grade is also available in powder form (LL 6301 RQ) which is
used in compounding
applications. |
LL 6301 grades can readily be processed
on commercially available injection molding machines. The optimum
conditions depend on many parameters e.g. application, mould design, etc.
but as a guideline the normal processing temperature should lie in the
range of 210-230 °C. The grade shows an improved cycle time: the higher
crystallization point of linear LDPE and its greater intrinsic stiffness
versus LDPE allow mold ejection at higher temperatures.
The LL6301 RQ powder version can be conveyed and fed through systems
designed to handle pelletized grades. However some minormodification may
be necessary.
The LL6301 grades are stabilized for protection against oxidation and
yellowing during processing under normal injection molding
conditions.
While LL 6301 YM contains an UV stabilizer, LL
6301 XR and RQ are not suitable for use in outdoor applications since they
don't contain any ultra violet light stabilization.
LL 6301 XR and LL 6301 YM are available as pelletized products. LL 6301 RQ
is supplied in powder form.
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