Meter/Mix FAQ

Frequently Asked Questions - Meter/Mix Systems

What is a Meter/Mix and Dispense System?

A Meter/Mix and Dispense system performs 3 basic functions. The system will meter out the material in the desired ratio required. The metered material is then mixed completely to ensure proper curing. The final function is dispensing the material at a controlled pressure or rate (and for some systems at a predetermined shot size) to the mold or process.

How accurate is a Meter/Mix system?

Our systems are designed to meter the materials at a 10:1 or 50:50 ratio with an accuracy of plus-or-minus 1%. For most liquid silicones and epoxies, this is well within the material specifications. All systems are calibrated and tested prior to shipment.

How does a static mixer work?

A static mixer is designed to mix the A and B materials (and optional color) without using any moving parts. The inside of the mixer as helical elements which are offset in relation to each other. As the material flows through each element, it is divided into two streams, rotated 90 degrees, and then joined back together. The process is repeated through each element until the material emerges from the mixer homogenized and ready to cure.

Mixers are chosen my bore size and number of elements. The larger the bore, the higher the flow rate. Larger bore mixers require more material to fill up, however. The total number of elements required to completely mix the materials depends n a number of factors. As a rule of thumb, a minimum of 18 elements is needed to mix 2-part silicone rubber, and a minimum of 24 elements is needed if color is added.

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ST Silicones, Inc. * 95 N Central Ave. * Mechanicville * NY * 12118 * (518) 664-0745