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Reinforced compounds with extremely high dimensional stability

Reinforced compounds with extremely high dimensional stability

It is well-known that in molding of thermoplastic compounds, the presence of fibrous structural reinforcements is the first cause of deformation due to differential shrinkage.

In fact, the fiber orientation during the filling stage results in even strong local differences in the elastic modulus values.

The anisotropy of the mechanical properties results in force systems that cause relative displacements between the various points of the product, and therefore dimensional changes as well as different types of warping.

It is also well-known that deformation is one of the toughest problems to solve, even using sophisticated tools such as the computer numerical simulations.

The percentage content of reinforcement is not particularly discriminating as to dimensional stability, since even a small fraction of fiber contained in the compound can cause significant deformations.

LATI decided to tackle the problem by conceptually reviewing the idea of reinforced compound. This research led to a new opportunity for the market of structural thermoplastic injection molded products.

The result is a family of high-end compounds ensuring extremely high dimensional stability despite the high percentage (up to 50 percent) of glass fiber reinforcement.

The new formulations, which today are designed for PPA, PPS, and PEEK, but also available for other resins, are extremely interesting, and do not involve any reduction of the main mechanical properties of conventional structural grades.

G/40 I6
G/40 D6
Elastic Modulus (Mpa) ISO 527(1) 15000 15000 13000
Load at break (Mpa) ISO 527(1) 185 190 170
Elongation at break (%) ISO 527(1) 1,3 1,7 1,4
Charpy (notched) ISO 179-eA 10 9 10
Charpy (unnotched) ISO 179-eU 35 40 30

Physicochemical properties of the matrices, and consequently the resistance to chemicals, moisture, and material temperature, remain unchanged.

It is clear that the new products featuring high dimensional stability are the answer for those cases where a compromise between mechanical strength and respect of project dimensions is not acceptable: precision engineering, electronics, robotics, automation, etc.

No limit has been accepted during the material optimization process, so the conversion of materials is as easy as that of standard products on conventional machines and molds.

02 October 2012
email: marketing@it.lati.com
LATI Industria Termoplastici S.p.A.
Via F. Baracca, 7 21040
Vedano Olona (VA) - Italy
Tel. : +390332409111 - Fax: +390332409307

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