The core criteria for judging the quality of pebbles include appearance smoothness, shape symmetry, texture hardness, particle size consistency and origin, which can be divided into the following dimensions:
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I. Appearance characteristics
Surface smooth and flawless
The surface of high-quality pebbles should be smooth and round, without soil residue, scratches or cracks. The cleanliness and processing technology can be preliminarily judged by touch and visual inspection.
Color and shape
The color should be uniform and bright, and natural colors such as red, yellow, and green are common;
The shape is preferably oval or round, and some unique shapes (such as flat) may enhance the ornamental value.
II. Texture and durability
Hardness and density: Pebbles with high density and hardness are more wear-resistant and pressure-resistant, and can be preliminarily judged by knocking sound or weight; Corrosion resistance: It is not easily corroded in acidic and alkaline environments and is suitable for long-term outdoor use.
3. Particle size and weight matching
According to the particle size, the reference standard weight range can be corresponded (such as pebbles with a particle size of 2-3 cm are about 10-20 grams). The particle size of the same batch of pebbles must be uniform to avoid large size differences affecting the paving effect.
4. Source and origin
Preferred origin: Pebbles in Sichuan, Yunnan and other places have better quality due to excellent geological conditions; Collection method: The quality of pebbles screened manually is usually better than that of mechanical batch collection.
5. Economic evaluation
By comparing market prices and origin information, choose products with high cost performance and avoid low-priced and inferior products.
Summary: When purchasing, it is necessary to comprehensively observe the appearance, test the texture, verify the source, and select matching particle size and shape in combination with actual uses (such as landscape, decoration, etc.). For special needs (such as filtration filter material), you can further pay attention to the professional parameters of pebble filter material.