Lighter PP Auto Parts Possible With New Synthetic Mineral Fibers From Milliken Hyperform® HPR Grades Increase Stiffness, Temperature Resistance

SPARTANBURG, S.C. — November 15, 2010 — The new Hyperform® HPR family of reinforcing additives
from Milliken provides processors with a new option for making high performance polypropylene parts
with low weight.

Hyperform® HPR-803 is intended primarily for the automotive sector. Milliken plans future
innovations aimed at applications in automotive, appliances and elsewhere.

“We envisage HPR-803 being used mainly in automotive applications, but are not limiting our
project scope,” says Adam Watson, in charge of marketing for the Hyperform HPR range. “It enables
the production of polypropylene compounds that have mechanical performance similar to or better
than mineral filled compounds, but at lower weight.”

HPR-803 fibers have a high aspect ratio of around 40:1. “We expect PP compounds containing
HPR-803 to replace talc-filled types and possibly other non-PP-based materials too,” says Watson.
“Tests have also demonstrated that HPR-803 works very well in combination with talc, giving
processors and end users the opportunity to convert to the new technology in a step-by-step

Hyperform HPR-803 is added at levels typically one third of those required for talc. This
means parts will be lighter, by up to 15%, and cars may use less fuel and have lower carbon dioxide

Several projects currently underway demonstrate the value of Hyperform HPR-803 in producing
lightweight parts with high stiffness. Watson cites development trials with an injection molded
bumper support. “Milliken demonstrated that a compound containing nine percent of HPR-803 could
deliver 10% weight savings over a 20% talc-filled compound, and still maintain dimensional,
stiffness and impact requirements,” he says.

HPR-803 also enabled the parts to be produced with a shorter cooling time and hence lower
overall cycle time. Furthermore, test parts demonstrated excellent performance under thermal
stability performance testing.

The value proposition does not stop at energy savings – aesthetics are also improved with
Hyperform HPR-803. The natural color of the additive is whiter than talc, so processors can cut
down on pigment usage to get the color they want. Parts containing the new reinforcing additive
exhibit a noticeably better surface finish and also higher weather resistance than glass fiber
reinforced PP parts with similar mechanical properties.

For compounders, Hyperform HPR-803 is easier to handle than chopped glass and therefore
presents less of a health and safety issue. Compounds containing HPR-803 exhibit good flow
characteristics, and can be handled in the same way as other PP compounds.

Recycled material exhibits little loss of mechanical properties, unlike glass filled
compounds. Wear on equipment is reduced at all stages of processing. Early data indicate that there
may be energy savings realized from compounding HPR-803, compared with talc and glass fiber

Hyperform HPR-803 is available directly from Milliken as a free-flowing powder, and can be
incorporated during compounding via a side-feeder. Milliken is working with compounders around the
world to develop compounds and masterbatches designed for various applications.

Posted on November 16, 2010

Source: Milliken Chemical