300 Mini Pumps are designed for convenient and accurate metering of Group A, B, and C WEST SYSTEM 105 Resin-based epoxy. The 300 Mini Pump Set Contains one resin pump and two hardener pumps. Pumps mount directly on the resin and hardener containers and eliminate the mess involved with measuring by weight or volume.
300 Mini Pumps are calibrated to deliver the proper working ratio with one full pump stroke of resin for each one full pump stroke of hardener. 105/205-206 pumps deliver approximate 0.8 fl oz of resin/hardener with one full stroke of each pump. 105/207-209 pumps deliver approximately 0.9 fl oz of resin/hardener with one full stroke of each pump.
Made of durable polypropylene, the Mini Pumps give years of dependable service. Read and follow the priming, ratio verification and operating instructions that come with the pumps.
As packaged, the pumps are ready to install on the Group Size B containers. A package of extension tubes for Group Size A containers is included with the set. Group Size C extension tubes are included in the 105-C Resin and in the 207-SC or 209-SC packages.
300 Mini Pump Supplement (pdf)
Many WEST SYSTEM® Epoxy users take their new Mini Pumps out of the bag, mount them on the resin and hardener cans, and begin dispensing and mixing epoxy, without ever having read the instructions. Most use them for years without a problem. Of those who do experience a problem, we’ve found that it most often could have been prevented by—you saw this coming—reading the instructions. The instructions offer simple steps that you can take to help assure that every batch of epoxy you apply to your project will cure properly and reach its maximum strength.
The ratio of each pair of Mini Pumps is controlled by the installation of a clip, that limits the stroke (and volume) of one or both of the pumps. All Mini Pumps are carefully inspected during this operation and during packaging. But the final test of a pump’s performance can’t be made until it is actually pumping resin or hardener, a test we can’t perform and still keep Mini Pumps affordable. The ratio verification test described in the instructions confirms that both pumps are dispensing the correct volume and that the ratio of resin to hardener is within a critical narrow range.
Read more about Mini Pumps at Epoxyworks. com