: Paste spilling over edges or connecting two separate pads.

: Requirements for the solder paste material itself. IPC-7527 Solder Paste Printing Standards | PDF - Scribd

The standard categorizes deposits into four primary shapes to help inspectors judge quality:

: Prevent rework and scrap by identifying issues like bridging, misalignment, and insufficient paste at the earliest possible stage. Key Content and Classifications

: Provide a "common language" for engineers, operators, and quality inspectors to define what constitutes a "good" print.

IPC-7527 provides specific thresholds for common printing errors. For example, is generally considered acceptable if the paste is centered within approximately 20% of the pad width , though Class 3 often requires tighter precision. Other critical defects covered include:

: Often seen in specific types of paste or print speeds.

: Major requirement is function of the completed assembly.

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