Flux materials for heated solder placement and associated techniques and configurations

A flux material for a heated solder placement process, the flux material comprising:

• a rosin material and a thixotropic agent that is configured to resist softening at a temperature greater than 80° C.;
• wherein the rosin material includes one or more of rosin ester, hydrogenated rosin resin, dimerized resin, or modified resin;
• wherein the thixotropic agent includes one or more of an organic bentonite, amide wax, or hydrolyzed castor oil;
• wherein the rosin material represents 10% to 80% by weight of the flux material without a metal powder;
• and
• wherein the thixotropic agent represents 10% to 80% by weight of the flux material without the metal powder.

A package assembly comprising:

• a package substrate having one or more pads;
• a flux material disposed on the one or more pads, the flux material including a rosin material and a thixotropic agent that are configured to resist softening at a temperature greater than 80° C.;
• and
• a solderable material coupled to the one or more pads using the flux material;
• wherein the rosin material includes one or more of rosin ester, hydrogenated rosin resin, dimerized resin, or modified resin;
• wherein the thixotropic agent includes one or more of an organic bentonite, amide wax, or hydrolyzed castor oil;
• wherein the rosin material represents 10% to 80% by weight of the flux material without a metal powder;
• and
• wherein the thixotropic agent represents 10% to 80% by weight of the flux material without the metal powder.