1. Observe and feel with the naked eye.
From the appearance, high-quality rock wool board has very fine fibers, soft and dense, with a brownish yellow color, low ball slag content, and is not easy to fall off. There is no obvious prickling sensation when touched by hand, and it is not easy to deform when pressed and stretched.
However, from the appearance, inferior rock wool boards have coarse and hard fibers, a bright yellow color, a high content of ball slag, and are prone to slag dropping. There is a noticeable prickling sensation when touched by hand, and when pressed and stretched, it is prone to deformation and severe debris loss.
The main reason for this difference is that the raw materials are different, and high-quality rock wool boards are mainly made of basalt, diabase, and other raw materials. After melting, the fibers thrown out are relatively delicate. However, low-quality rock wool boards mainly use blast furnace slag as raw material, and the fibers produced after melting are relatively thick and easy to break. The second reason is that the production process and quality of the production line are different. A high-quality rock wool production line will melt the raw materials more thoroughly, spin the fibers more finely and gently, and spray glue and hydrophobic agents to assist small materials more evenly and reasonably. However, low-quality rock wool production lines perform poorly in these production processes.
2. When purchasing rock wool boards, we must ensure that the seller provides a testing report and carefully review the testing data on the report. For example, rock wool bulk density, size error, thermal conductivity, hydrophobicity, water absorption, compressive strength, tensile strength, etc. These data are important indicators that affect the quality of rock wool. In addition, the testing report must be selected from a testing unit at or above the provincial level, which is good for being at the national level and more authoritative. It should also be stamped with a red seal to prevent counterfeiting!
3. On site factory inspection. If there is enough time, it is recommended that customer friends conduct on-site factory inspections to prevent dealers from impersonating manufacturers, using inferior products as good ones, and false advertising. If you really can't find time to go to the factory for inspection, we can provide you with samples of the same specifications and ensure that the quality of the samples is consistent with that of the bulk goods.
