What's Cross-Link:

Cross Link Wire is a bit different, mostly in the insulation. "Cross-link" refers to the chemistry of the insulation. Cross-linkage is where many long-chain molecules attach to each other and form a stronger bond, resulting in insulation that is more closely bonded with the wire than PVC. These bonds result in more durable wire that is better suited for extreme conditions over GPT wire. For example, cross-link can generally take a higher current and is rated for temperatures between -40 degrees and 257 degrees Fahrenheit. It's also more resistant to grease, solvents, and other common chemicals fleet vehicles are exposed to.

For this reason, cross-link is commonly used in heavy-duty applications where you need wire that can take a beating, such as fuse blocks inside engine compartments, and in electrical systems more likely to be exposed to open air and the elements. This ruggedness is one reason for the higher cost associated with cross-link.