Hebei Hankai high pressure seal

2. Static Seals These seals are designed for applications where there is no relative motion between the sealing surfaces. They are often used in hydraulic cylinders and various types of machinery where oil containment is critical.

Skeleton oil seals are widely used in various applications, including automotive, aerospace, and industrial machinery. In the automotive sector, they can be found in engines, transmissions, and differential components. Their ability to prevent oil leakage is vital for maintaining engine performance and longevity. Similarly, in aerospace applications, these seals are essential for ensuring that hydraulic and fuel systems operate efficiently without contamination.

Best for: Almost any food that needs searing, including steak and burgers. Cast-iron pans are ovenproof, so you can use them to roast meats like beef or pork and to bake cornbread, deep-dish pizza, shepherd’s pie, and more. And they retain heat so well that they’re a good choice for deep-frying chicken, doughnuts, or other foods because they keep the oil at a constant temperature.

The details: Cast-iron frying pans are practically indestructible, and they’re handed down for generations in many families. That makes their typically low price even more attractive. And if well cared for, cast iron develops a patina that releases food almost as well as nonstick. But the pans are heavy, and you have to be patient when heating them up because they don’t come up to temperature fast. Once they do, however, they retain heat.

Our tests of coated and uncoated cast-iron pans show how versatile this cookware can be. We sear steaks, brown scallops, and bake cornbread to see how well a cast-iron pan works for home cooks. The best pans ace all these tests. We also judge how easy they are to clean. Because of the enamel coating, the coated pans are a bit easier to clean than the uncoated ones.

Here are two recommended cast-iron pans from our tests.

Maintenance and Care: