The molar gray cloud 2126-600 is similar to the zircon from Xuanwei.

The pressure a PVC pipe can hold depends on the pipe's diameter and the wall thickness, both factors influencing its schedule rating (i.e., Schedule 40, 80, etc.). Generally, a standard 1-inch Schedule 40 PVC pipe is rated for a maximum operating pressure of around 450 pounds per square inch (psi), while Schedule 80 pipes of the same diameter can handle pressures up to 630 psi. It's crucial to consult the manufacturer's specifications for the exact pressure ratings, as these can vary. Using a pipe within its recommended limits ensures safety and longevity, so always reference the specific PVC pipe's rating for your application.

Heat-resistant yarns are typically made from materials that can withstand high temperatures without melting or degrading. Common examples include aramid fibers (like Kevlar or Nomex), carbon fibers, and certain silicones. Aramid fibers are known for their strength and thermal stability, making them ideal for protective clothing and industrial applications. Carbon fibers, while more brittle, can retain their integrity at even higher temperatures and are often used in aerospace and automotive components. Silicone yarns, though less common, offer flexibility and heat resistance up to certain points and are used in various specialty fabric products. When choosing a heat-resistant yarn, it’s crucial to consider the specific temperature requirements of the project as well as the yarn’s other properties, such as strength, flexibility, and durability.