Rob- cps stands for centipoise, a unit of viscosity. KCPS is thousands of centipoise. ASTM, and possible IPC, have methods for testing paste viscosity. Also, try suppliers such as alphametals (Cookson). Michael Alderete Rob wrote... ------------------------------ Date: Mon, 22 Mar 1999 14:31:17 -0500 From: Rob Watson <[log in to unmask]> Subject: Paste Viscosity Boy, I am full of questions today... As you can tell, I am really digging into the screen printing operations. I have one more question, I have a troubleshooting guide for the SMT process. Actually, a presentation someone gave me from a SMTA meeting about 2 years ago. Anyways, this guide recommends that solder paste viscosity be between 1000 KCPS +/- 10%. Does anyone know what this is? How would you go about testing to verify this? What test methods and equipment would you use to do this? Thanks again for your support in advance, Rob Watson Sanmina Corp. ------------------------------