Present-day cylinder shave a silica lime filler to which some manufacturers add asbestos, charcoal, and other materials to provide a lightweight filler with a higher porosity.

• 目前的钢瓶采用切成薄片的硅土石灰填充物，一些生产商在里面加入石棉、木炭和其它物质来得到多孔性更高的重量很轻的填充物。