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Innovative Plastic Materials from an Innovative Manufacturer

Innovative Plastic Materials from an Innovative Manufacturer

Innovative Plastics Manufacturer

Produces Innovative Sheet and Rod Materials

Gehr Plastics has been a major global manufacturer in the plastic sheet and rod industry since 1932. During this period, Gehr has become a leader in a variety of product lines, and also become known for very large sizes in both sheet and rod. Currently Gehr can produce Acetal rod up to 20″ in diameter and sheets up to 8″ thick.   Some of the many plastic materials the Gehr produces:ECO GEHR plastic rod

Winner of the 2008 Bioplastics Award

Radel R5500 Performance Plastics

Radel Rod is produced in many medical grade colors

Being innovative also means looking forward. Gehr was selected as the Bioplastics manufacturer of the year in 2008, partly for the new line of plastic materials which have a bio base. These materials have a variety of bio based forms, including: a PLA base, Cellulose based, Polyamide and Wood – Plastic Composite (WPC). One such material is ECOGEHR PLA-L which is a blend of polylactic (polylactic acid), some lignine, fatty acid and wax. This biopolymer is new to our industry and can be used in temperatures ranging from -22 °F to +140 °F. This complete line of materials is one of the only available in the plastic industry to be comprised of many renewable raw materials. Gehr leads the way in this exceptional and innovative product line.

ClearGehr Polyamide Rod

This brand new product is a Clear Polyamide rod. The outside surface is as extruded, and can be polished. This enables the production of a relatively clear sight glass quality material with most of the high end properties of Polyamide – Nylon material. We have supplied this material for small machined parts where neither Polycarbonate nor Acrylic would work well. Because of the natural inherit chemical resistance of Polyamide, this high end ClearGehr rod can out perform all normal transparent plastics. Give us a call to see if this new innovative product will work in your difficult application.

FDA Approved Wear Grade Acetal

Have you been looking for an extended wear Acetal material (like the PTFE filled Acetals – Delrin AF), but need it to be FDA approved? Then perhaps you should consider WearGehr. This proprietary filled Acetal material has excellent wear resistance, and retains the FDA approval of the base Acetal, unlike the PTFE filled Acetal materials which are not FDA approved. It is made in a blue color for easy identification, also it remains very machinable. Contact us for more information on this excellent high tech material. Call us at 866-832-9315 or send us a note here.

Unitrex Lf20 – Replacement for PCTFE and Vespel SP-1 for many demanding applications?

Unitrex Lf20 – Replacement for PCTFE and Vespel SP-1 for many demanding applications?

Unitrex Lf20 – PTFE Filled PEEK

A newly released form of Filled PEEK is now available. This PEEK is filled with PTFE and is called Unitrex Lf20, and it is filled with 20% PTFE. This new grade of PTFE Filled PEEK plastic was originally produced by Nytef Plastics. It is an extruded thermoplastic that comes in both rod and sheet form. This grade has significantly improved properties over the standard unfilled grades of PEEK. The PTFE filler provides excellent wear properties and has a very low co-efficient of friction, which makes this a great material for sliding and wear applications, and is made to last for long periods of abuse. Unitrex Lf20 has great machinability and dimensionally stability. It has a wide range of uses in such fields as medical, semi-conductor, and aerospace seals, where standard PEEK is too rigid. These properties enable this material to replace Polyimide (Vespel®) and PCTFE (formerly Kel-F) in many applications of high chemical resistance and the ductility for use in seals. This Filled PEEK works extremely well in Medical, Semi-Conductor and Aerospace Seal applications.

PTFE Filled PEEK vs. PTFE Filled AcetalUnitrex LF20 - Mechetec PEEK

Comparable to Lf13 which is 13% PTFE filled Delrin® (Delrin® AF), which is also good for most of the same types of applications but cannot withstand the high temperatures than that of Unitrex Lf20. The PTFE Filled PEEK has a melting point of 650 degrees F while the PTFE Filled Delrin® – Unital® Lf13 has a melt point of 347 degrees F, making both materials high temperature plastics.

Because the Nytef Unitrex Lf20 is filled with PTFE (which has the lowest co-efficient of friction of any plastic), it is ideal for sliding and wear applications. It also has a kinetic and static friction resistance of 0.1 which makes it the perfect choice for jobs were heat from friction should not be generated and part longevity is critical. Unitrex Lf20 offers superior properties to many other plastics, such as high heat and chemical resistance but also great friction resistance along with improved properties to make it a great plastic for a wide spectrum of uses.

Why Change from Vespel SP-1 or PCTFE to Unitrex Lf20?

While this new PTFE Filled PEEK will not replace the Vespel SP-1 and PCTFE in all applications, it certainly will in many applications (see table for comparison). The main reason to make a change is, drum roll please, COST. The Unitrex Lf20 is up to 30% less expensive that the other materials. With similar and comparable properties, consider making the change.

Unitrex® Lf20 also exhibits a far superior chemical resistance to that of its Acetal counterpart due to PEEK having a far better range of chemical resistance to aqueous and organic environments as well as acids and alkalines. Acetal Copolymer tends to degrade when exposed to such chemicals like sulfuric acid and chlorine while PEEK only tends to be attacked by halogens and hydrocarbons such as in crude oils. For additional properties and to compare the Unitrex LF-20 to Dupont Vespel SP-1 and PCTFE see the table below. Here is a copy of the full data sheet on Nytef Unitrex Lf20.

Standard Properties Table

Properties TestMethod Unit UnitrexLF20 Nominal Value PCTFE(Kel-f) Nominal Value VespelSP-1 Nominal Value
Specific Gravity ASTM-D-792 1.42 2.1 – 2.14 1.43
Tensile Strength ASTM-D-638 psi 11,500 4,800 – 5,300 12,500
Tensile Modulus ASTM-D-638 psi 460,000 207,000
Flexural Modulus ASTM-D-790 psi 500,000 180,000 450,000
Rockwell Hardness ASTM-D-785 84-D 90-D 45 – 60 E
Melting Point DSC degress F 650 410 – 415 680+
Flammability UL 94 @ 3.0mm V-0 V-0 V-0
Kinetic Coef. of Friction ASTM-D-1894 0.1
Static Coef. of Friction ASTM-D-1894 0.1

For additional details on these and other materials, please contact us here or call us at 866-832-9315

Unitrex and Unital are registered trademarks of Polymer Industries
Delrin and Vespel are registered trademarks of E.I. Dupont