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1) First of all, look at the bulk density: perlite ore in the heating process at a high temperature for a long time, and then heated to a high temperature above 1200℃, the surface burning glass, forming a closed cell environment, so called closed cell perlite is also called glass glass beads. The proportion of obturator perlite is larger and 80kg/m³ is lower. Generally in 110-150 mesh kg/m³ Above, higher than 150 mesh is not suitable for wall insulation. There are also some businesses opportunism, with not normal expansion of mineral sand raw material to pass as glass bubbles, high strength, but the general bulk density will be 200 kg/m³ Above, can not be used for wall insulation. Opening expanded perlite due to relatively large particles, irregular, void is not called large, opening, bulk density is relatively light, generally in 80kg/m³ The following.

2) Particle size: the general glass bubbles are mostly 30~50 mesh. If a large amount of fine powder is found in the glass bubbles, it is usually perlite ore (commonly known as raw material) which has not been calcined at sufficient temperature. These powders cannot achieve thermal insulation effect, and because ore is not calcined, the proportion is very large. It is recommended to choose glass bubbles with uniform particle size and less fine powder. Some particles are relatively large, in about 10 mesh, the surface is irregular, the surface has obvious openings.

3) Look at the hardness/strength: the perforated expanded perlite will be broken by hand, and most of it will be broken after mechanical mixing with the addition of rubber powder, while the glass surface of the glass glass beads is greater than the hardness of perlite, and the breakage rate is relatively low after mixing. However, it is still not recommended to stir glass bubbles in the blender for too long.

4) Look at the floating rate of the water: take a certain amount of glass bubbles in the water, the more glass bubbles sink to the bottom or faster, indicating that the more holes, the worse the surface vitrification, the perlite with holes will naturally sink to the bottom after absorbing water. But now it is rare to see glass bubbles floating on the surface for long periods of time.

5) Look at the water absorption rate: take out the glass bubbles soaked in water and weigh them. The overweight part is the water absorbed by glass bubbles. The higher the water absorption rate is, the lower the obturator rate is.