Why should a solder joint be less than 110degc?

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Apparently you didn't read the entire sentence...

Above that, there is a limitation for the component’s solder joint not to exceed 110 °C in continuous operation.
Click to expand...

Soldering isn't operating.

The statement means the resistor film is in excess of 110C if the solder joints are at 110C.
 

Continous operation is the keyword I guess. Obviously it won't melt the solder paste, but device won't tolerate this operating (quasi ambient) temperature.
 

The way the Vishay word salad is packed, makes me think
this is about thin film resistivity stability and/or trim stability.
The criterion may not be failure but tolerance drift.
 

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