Semco® Model 250-A Sealant Gun: Precision Dispensing Excellence for Aerospace

The industry-leading Semco® Model 250-A sealant gun represents the gold standard in precision material application across aerospace. This professional-grade pneumatic dispensing system delivers unparalleled performance when applying sealants, adhesives, potting compounds, and specialized materials packaged in Semco disposable cartridges or Semkit® packages for multi-component formulations.

Engineered for durability and precision, the Model 250-A features robust construction combining premium metals and high-performance engineered plastics designed to withstand demanding production environments. The standard configuration accommodates 20oz disposable cartridges with black anodized aluminum retainers secured via precision-machined aluminum bezels. For operations in space-restricted areas, the removable handle provides enhanced clearance and maneuverability without sacrificing control.

The ergonomic design incorporates a metal multi-axis swivel air fitting compatible with various hose assemblies available in 5ft and 10ft. Connection options include Aro, Hansen, Schrader air fittings, or universal ¼" female fittings for alternative air supply systems. This adaptability ensures seamless integration with existing production infrastructure.

When paired with PPG Industries' Semco precision-molded cartridges, plungers, nozzles, sem-luer adapters, and sem-needles, the Model 250-A delivers unmatched dispensing accuracy. The system's responsive trigger mechanism provides precise control over material flow, allowing operators to apply exact amounts of material exactly where needed—whether as individual drops, measured shots, or continuous beads.

Operation is intuitive and efficient: simply attach the air hose to a regulated compressed air source, load the cartridge into the retainer, secure to the adapter assembly, and dispense with trigger control. Material flow is governed by viscosity, air pressure, orifice size, and trigger duration, offering complete application versatility for your most demanding precision dispensing requirements.