What is solder Graping?
Solder graping is the incomplete coalescence of solder powder into a solder joint. It’s called “graping” because it looks like a bunch of grapes.
What is Graping oxide?
Graphite oxide (GO), formerly called graphitic oxide or graphitic acid, is a compound of carbon, oxygen, and hydrogen in variable ratios, obtained by treating graphite with strong oxidizers and acids for resolving of extra metals. The maximally oxidized bulk product is a yellow solid with C:O.
Is graphene oxide safe in humans?
Lungs. Initial studies suggest that graphene is safe for long-term occupational exposure, but inhalation of graphene oxide should be avoided, depending on the size of the particles.
What is graping in solder paste and why does it matter?
Graping has increasingly become a problem for manufacturers as lead-free pastes become standard, requiring higher reflow temperatures. The trend towards smaller electronics also contributes to graping. That’s because smaller paste volumes lead to more oxidation, especially at the surface of the solder powder.
What is “graping”?
The phenomenon where small/fine pitch pad deposits (0402, 0201, 01005 etc) appear to not reflow has been recently termed “Graping”, due to the reflowed solder deposits likeness to a bunch of grapes. Graping is often confused with a cold solder joint.
What is partially coalesced solder?
The solder that is partially coalesced looks like a cluster of grapes which is where the phenomenon’s name is derived. Graping occurrence has continued to increase since it was first identified in 2006. The viscosity of the flux decreases as the temperature of the reflow oven increases.
What is the advantage of the nanoslic stencil coating over graping?
Graping is typically seen on smaller pads, where there might not be a high enough volume of solder paste. Our NanoSlic stencil coating provides the benefit of increased solder paste volume, even through apertures down to 0.300 AR (area ratio). Apertures can typically be enlarged for higher solder paste volume.