How to tell whether calcium carbonate is added to PPR?

A relatively simple way is to determine whether calcium carbonate is added by testing the density of PPR water pipes. The density of normal PPR water pipes should be 0.89-0.91g/cm3. The density of calcium carbonate is above 2.7g/cm3, so if calcium carbonate is added, the overall density of the PPR water pipe will be higher than the normal 0.89-0.91g/cm3 density range.

How to measure it specifically? We can first cut off a small section of the pipe for testing. Everyone knows that density = mass/volume. The mass here is easy to solve. You can know it by weighing it. The volume of the pipe fittings is not easy to measure. At this time, we can use the physics knowledge of junior high school and use the drainage method to measure the volume of the pipe. Finally, the measured value is taken into the formula to calculate the density.

In addition, there is now a "one-dollar method to check whether impurities are added to the water pipe", which can also be used as a reference. It uses the principle of water buoyancy. The specific method is to cut a 60g PPR pipe, take a one-yuan coin and insert it into the cut PPR pipe, put it in water, if it floats, it means no impurities have been added, if it sinks, it means the pipe has been added with calcium carbonate impurities. This experiment also uses the principle that the density of the water pipe with calcium carbonate added is greater than that of the water pipe without calcium carbonate added.