Ratio Range and Metering Accuracy
Specification one is the ratio range, typically 1:1 to 10:1, which must cover every fluid you run today and plan to run. Specification two is metering accuracy; look for plus or minus one percent or better at your target shot size, not just at the maximum. Ask vendors to demonstrate accuracy at your smallest dispense weight, because that is where errors hide.
Tank Capacity, Viscosity, and Material Handling
Specification three: tank capacity and agitation. Thermally conductive dispensing machine or heavily filled epoxies settle, so heated, agitated tanks with level sensors are essential. Specification four: maximum viscosity, which should exceed your thickest compound with margin, verified through your actual material rather than datasheet numbers. Filled abrasives demand hardened pump components, so state your filler content upfront.
Mixing, Motion, and Software
Specification five: mixing method. Static mixers are cheap and clean; dynamic mix heads suit extreme ratios and viscosities but require maintenance cycles. Specification six: software capability, including multi-layer pouring, line-versus-dot dispensing machine, weight compensation for gear-pump backlash, and recipe storage for quick changeovers. A machine scoring well on all six specifications will stay productive for a decade of product changes.
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