Home

Quality Control >> Raw Material Quality Control

Control of Incoming Raw Materials

In powder coating manufacture, raw materials are dedicated and subsequently processed to meet a customer’s requirement. Unlike paint manufacture where the batch is processed and eventually adjusted near the end to meet quality requirements (i.e., shade, viscosity, etc.), powder coatings are very difficult to adjust toward the end of manufacture. The utmost in care must be taken to make sure the batch is correct right from the start. Consequently quality control really should emphasize raw material and process control rather than assessing properties after the batch is made.
This can be accomplished by guarantying that your raw materials are consistent and within specification. A basic compendium is listed below.

Resins and Crosslinkers
• Functionality: Acid Value, Hydroxyl Number or Epoxide Number.
• Melt Viscosity (ASTM 4287)
• Color (ASTM D1544)
• Cleanliness

Pigments
• Color (ASTM D2244)
• Oil Absorption
• % Water

Extender Pigments
• Oil Absorption
• Particle Size
• Color

Additives
• Viscosity

• Melt Point or Softening Point