The most important step in deciding a spray gun model is determining the type of fluid that will be used. For oil, paint, water, and alcohol, one can use a standard brass or aluminum spray gun, but stainless steel or polyphenylene sulfide (PPS) resin is necessary when using corrosive fluids. For high-viscosity fluids or fluids with solid substances, the selection becomes more limited.
The selection can be narrowed down further according to three basic elements. The first is spray pattern. The spray pattern, or shape of the spray, can include round, flat-fan, wide round, wide flat-fan, and small round patterns. The pattern should be matched to the size and shape of the object to be applied to. The second item is the number of air inlets. Lumina automatic spray guns include single-inlet models and models with two or three inlets. Single-inlet models (such as the ST-5 and HM-1) do not allow for the particle size or force of the spray to be adjusted. For applications in which it is desirable to avoid overspraying or to be able to finely adjust the force of the spray, we recommend models with two air inlets (such as the ST-6 and HM-6). (For details, see the section entitled “What is the difference between the ST-5 and ST-6 or the HM-1/HM-3 and HM-6?”) Once you have determined a spray gun type, the last thing to decide is nozzle size. The ST series is compatible with four nozzle sizes ranging from 0.5 mm to 2.0 mm. Please select a nozzle size depending on fluid viscosity and spray volume. (Also, please read the section below entitled “Concerning spray gun selection.” For consultations involving spray gun selection, please contact us via the Contact page.)