Powder Coating
SQI Performance Coating
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The Powder Coating Process:

Step 1 – Processing of an Order

When placing an order use the "Printable Order Form" (pdf format or Word format) to provide the necessary information. Include the completed order form when sending your part for powder coating to SQI. A customer inquiry can be made via phone or E-mail.

When the parts are received at SQI, a customer service representative will review the completed order form and the enclosed parts. The information and part count will then be logged in and work instructions and color specifications will be generated. An ID tag and a job router sheet listing the proper work instructions for each part is then printed. This router tracks part preparation, blast time, cleaning of parts, powder coating type and color, baking time, and packaging instructions after coating. This router stays with your parts through out each operation to ensure that your parts are processed exactly as desired and that they are returned to you with the high quality coating you expect.

Step 2 – Part Preparation

Part preparation can include many steps depending on the desired processing and part type. We review the customer’s coating and masking instructions to make sure that only the correct areas are powder coated. Tapped holes and other openings are plugged or taped to ensure that the blast media or coating does not enter these critical surfaces. All our masking tape and plugs are a special high temperature silicone made to withstand the elevated temperatures of the powder coating process.

Step 3 – Part Pretreatment (Cleaning)

The most important step in the powder coating process is the pretreatment of the parts. Proper pretreatment cleaning ensures that the powder coating will attain the maximum adherence properties. When this step is over looked, the coating performance may be severely decreased over time. Our processes are designed for maximum performance and long life.

We review each of your parts and determine the proper pretreatment steps well before the powder coating is applied. These steps may include pressure blasting with aluminum oxide or glass beads and / or elevated temperature chemical washing, rinsing & sealing. Castings and used parts where oil or grease is well embedded often offer challenges for proper cleaning.

Step 4 – Part Coating

After the parts are clean, they are placed on racks for the coating process. It is important that each part be hung properly onto the rack to ensure grounding for the electrostatic charge that is essential for the powder coating process. In addition to the proper grounding, parts are also hung on specially designed hangers to minimize or eliminate the mark from the hanger. After the parts are placed on the rack, powder coated is applied using a special powder-coating gun. The powder is positively charged during discharge from the gun and is attracted to the negatively charged part. All sides of the part are visually inspected under bright lighting to ensure complete coverage of the workpiece.

Step 5 – Curing of the Powder Coating

The racked parts are then moved into one of our convection curing ovens that operates at 400 degrees F. As heat is applied during the 20 to 30-minute convection curing cycle the powder melts and flows over the surface and cures to a tough durable high-quality coating. The part curing is critical to get the proper hardness and performance of the powder coating. Our ovens are calibrated using an infrared and thermal couple inspection devices to ensure that the correct curing temperatures are used.

Step 6 – Cooling & Inspection

Upon exit from the oven, parts are allowed to cool to room temperature before removal for inspection. The parts are then removed from the racks and inspected visually for both color and quality. Parts that do not pass our 100% inspection process are reviewed and re-routed for additional work.

Step 7 – Packaging & Shipping

After inspection, all the parts are sent to our packaging area. All masking and plugs are then carefully removed from the parts. Parts are again visually inspected for proper coverage. All part surfaces are then clean to remove any residue from the tape or plugs. The parts are carefully wrapped and boxed for protection during shipping. Parts can be shipped by UPS or can be held for customer pick up. Large parts may be shipped by common carrier.