Disclosed is a biaxially-oriented polyester film produced from a polyester comprising: (1) diacid residues comprising between about 95 and about 100 mole percent of terephthalic acid residues; (2) diol residues comprising between about 95 and about 100 mole percent of 1,4-cyclohexanedimethanol residues; and (3) about 0.5 to about 5 mole percent of another dicarboxylic acid or diol residue, wherein the polyester comprises a total of 100 mole percent diacid residues and a total of 100 mole percent diol residues. In one embodiment, the biaxially-oriented film has a thickness of 70 to 150 microns (3-5 mils). In another embodiment, the biaxially-oriented film undergoes not more than 3% shrinkage when immersed for 10 seconds in a solder bath preheated to 260.degree. C. The film can be made by stretching an essentially amorphous cast film of thickness between about 450-1800 micron (18-70 mil) at a ratio from about 2.5.times.2.5 to 3.5.times.3.5 while being held at a temperature between 90.degree. C. and 130.degree. C., and heat-setting the stretched film at an actual film temperature of from 260.degree. C. to Tm, where Tm is the melting point of the polyester as measured by differential scanning calorimetry (DSC), while maintaining the dimensions of the stretched film.