Hollow Bath Ball Blanket LW Scientific’s Water Bath Blankets are an incredible addition to your lab or clinic and save you money and time. Use them instead of a lid on your water bath. Immerse your tubes through the ball thermal layer, and never have to worry about removing a lid and replacing it! The thermal ball layer retains the water vapor, and the heat! Because it is so efficient at retention, it lowers the work load on your water bath’s heaters and motors, making them last longer and use less energy. Our Hollow Bath Balls can be used up to boiling (100°C).