3M to Introduce New Rubber Processing Aid at ACS Spring Technical Meeting / Symposium

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Experiments show 3M™ Dynamar™ RA 5300 provides improved injection molding performance, better mold release.

Download a White Paper About 3M Dynamar RA 5300
Watch a video of the extrusion process using RA 5300 at the 3M™ Dynamar™ RA 5300 website.

Just in time for the American Chemical Society’s (ACS) Spring Technical Meeting and Rubber Division Symposium, April 18-20 in Akron, Ohio, 3M is unveiling a promising new process aid for fluroelastomer (FKM) compounds that offers processing and performance improvements over many existing products.

3M™ Dynamar™ RA 5300 has been shown to perform at a higher level with less sacrifice to the desirable properties of an FKM compound, and shows potential as a replacement for conventional materials such as Carnauba Wax. An Executive Summary white paper which describes the results of 3M laboratory experiments with Dynamar RA5300, other conventional processing aids and a control compound without process aid is available.

Capillary Rheometry was used to compare the flow properties of each compound over a range of shear rates, and processability of the four compounds was evaluated for Garvey die extrusion. An additional comparison of processing characteristics was made via an injection molding trial to evaluate flow, mold release and mold fouling.

Some key points from the experiments –

  •     The Dynamar RA 5300 product and control compound exhibited similar results and characteristics throughout the experiments in terms of scorch times, cure times and maximum torque values.
  •     In a physical property comparison, the RA 5300 produced slight differences to the control in terms of hardness, tensile strength and modulus values, with no significant change in elongation at break. In compression set results, the control and RA 5300 compounds exhibited virtually identical characteristics.
  •     After heat aging for 70 hours at 270°C /518° F, the compound containing RA 5300 had relatively low losses in tensile strength and elongation increase when compared to the control.
  •     Extrusion with a Garvey die shows the advantage of using RA 5300 in comparison with other conventional processing aids or the control, as the sample containing RA 5300 produced better surface finish, and better defined lines than any of the other samples.
  •     Flow comparisons from the injection molding experiments produced insignificant differences, but all samples except for those produced using RA 5300 stuck in the mold grooves, pulled the part away from the nozzle tip and had to be pried from the mold using a wooden tool. Parts molded using RA 5300 released totally from the groove and could be pulled out without the use of any tooling.

Based on the results of these and additional experiments conducted at the same time, 3M™ Dynamar™ RA 5300 shows distinct promise as a process aid in fluroelastomer compounds. For detailed information regarding the equipment and experiment set up used to evaluate product performance, download the Executive Summary white paper on RA 5300 here.

To learn more about the product, and to watch a video of the extrusion process using RA 5300, visit the 3M™ Dynamar™ RA 5300 website.

Visit 3M at the ACS Spring Technical Meeting / Rubber Division Symposium at the Hilton Akron/Fairlawn Hotel, April 18-20, 2011 in Akron, Ohio. Presentation is April 20th at 2:45pm.

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Jodi Miller
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