More electrically insulating than Garolite XX, these tubes are often machined into insulating washers, bushings, transformer spacers, and parts of terminal boards. Made of phenolic resin with paper reinforcement, they’re lightweight yet strong. While not as strong as Garolite XX, they absorb less water, so they work well in humid environments. These tubes won’t split during machining. They also won’t wear down tooling as fast as phenolic products with glass cloth reinforcement.