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导读：在新买的浴盆里洗个热水澡，感觉太舒服了！别急，如果你正打算买个浴盆，听听专家怎么说，里面还有不少学问呢。 (按制作浴盆的材料分类介绍)

Before purchasing a tub for a remodeled bath or a new one, consider what tubs are made of these days. 

With hundreds of shapes and sizes to choose from, buying a tub can be overwhelming. Even for the standard 32- x 60-inch bathtub, you have several choices of materials. And the material you select determines the tub's price, durability, and cleanability. Because it involves walls, floors, plumbing lines -- and your back -- ripping out and replacing a tub isn't something you'll want to do again for a long, long time. Here are your choices.

Plastic, either fiberglass or acrylic(丙烯), offers the greatest design flexibility because it can be molded into many shapes. It's warm to the touch and insulates well, too, so water doesn't cool as fast as in enameled steel(搪瓷) or cast iron(铸铁) tubs. Plastic is also the lightest tub, weighing in between 60 and 70 pounds. Although it doesn't chip easily, abrasive cleaners will damage the surface.

Enameled steel, formed steel with a porcelain enamel coating, is the least expensive tub. But the material brings drawbacks: Steel conducts heat, meaning tub water cools quickly; the surface is prone to chipping; and it weighs about twice as much as plastic.

Cast iron tubs, like steel, are coated with enamel. However, they don't chip as easily as steel because the enamel coating is thicker than on steel tubs, and cast iron is more durable and resistant to impacts. At first, a cast iron tub will pull heat from water, but once it heats up, it will keep water warm for a long time. Cast iron's main drawback is its weight, 350 to 500 pounds, which may complicate upstairs installations.

Cast polymer(铸型用聚合物) tubs traditionally replicate the look of marble, granite, or onyx([矿]缟玛瑙), and are now available in a range of solid colors(纯色). Cast polymer costs a little more than acrylic; however, its surface doesn't stand up as well. With time, the gel-coat finish on cast polymer tubs can become brittle and expose the material underneath, leading to cracks.