Metton® LMR: Mechanical Properties

The Metton LMR reaction injection molding process can provide large parts in low pressure molds with the mechanical property performance similar to injection molded engineering thermoplastics. The combination of Metton LMR’s process and material capabilities result in a new design freedom for replacing traditional materials such as metal, wood and fiberglass.

Injection molded engineering thermoplastics have a similar benefit package for smaller parts. Small parts for Metton LMR are in the 8 to 10 ft² (1 m²) range which is the upper end for cost and size capability for standard injection molding. In addition, Metton LMR parts do not require identical part geometry for multi-cavity molds.

Fiber reinforced products tend to have poorer durability, but higher equivalent section modulus. In most semi-structural applications, Metton LMR can be designed to provide equivalent part stiffness for performance and generally at a significant weight reduction.

This section contains polymer property data necessary to initially assess the compatibility of Metton LMR with a particular application. The Metton LMR product family includes a standard M15XX product line and a flame-retardant product which meets the requirements for classification as U.L. V-O. The Metton M15XX includes the products M1534, M1537, M1539 and M1540. The Metton V-0 product uses a special three stream RIM injection machine.

Please request our Metton LMR Design Guide for more detailed guidelines.

Typical Design Properties of Metton (LMR) Polymer*

1. M15XX test plaques molded at 5.5-mm (0.215-in.) and cavity and core temperatures of 87°C and 57°C respectively.

2. M2100 V0 test plaques molded at 3.2-mm (0.125-in.) and cavity and core temperatures of 87°C and 57°C respectively.

3. HDT will vary with part thickness.  Generally about 108°C (226°F) for 3.2mm (0.125 inch) thick plaques and 120°C (248°F) for 5.5mm (0.217-inch) thick plaques

4. Dynamic Mechanical Analysis

5. M15XX meets UL yellow-card flame-resistance criteria of UL94-HB at a thickness of 0.125” (3.2mm) and above.  M21XXVO meets flame-resistance criteria of UL94-VO at a thickness of 0.125” (3.2mm) and above  [testing indicates it will pass UL 94-5V at a thickness above 0.225” (5.7mm)].

Mechanical Properties are based on conservative values either long-term aged or freshly molded. More details on long-term aging performance available in Metton LMR Technical Bulletin Vol. 3, No. 7. Metton America, Inc. (MAI) cannot anticipate all conditions under which this information and its product or the products of other manufacturers used alone or in combination with its products, may be utilized. As such, MAI accepts no responsibility for results obtained by the application of this information or the safety and suitability of its Metton LMR products used either alone or in combination with other products. Users are advised to perform such test as they may deem appropriate to determine the safety and suitability of such product or product combination for their own purposes. Unless otherwise agreed in writing MAI supplies it products and other information without any expressed or implied warranty, and buyers and users assume all responsibility and liability for loss or damage from the application and/or use of the products, either alone or in combination with other products, or other information provided by MAI.