**Appearance**: Potassium dihydrogen phosphate (KHâ‚‚POâ‚„) should appear as colorless tetragonal crystals or a white crystalline powder. If the product appears as small crystals or fine powder, it is considered normal and does not indicate any quality issues.
**Content**: According to the HG2321-92 standard, agricultural-grade potassium dihydrogen phosphate must have a content of at least 92% on a dry basis, while first-grade products should meet a minimum of 96%. However, most products currently available in the market are labeled with a content of ≥98%, which is higher than the standard requirement.
**Purchasing Tips**:
(1) Genuine products should clearly state the potassium dihydrogen phosphate content on a dry basis as ≥98%. Be cautious of products that only list the total content of various elements or other substances as ≥98%, as these may be misleading.
(2) Some products may claim a 98% KH₂PO₄ content but still fail to meet quality standards. This is because the HG2321-92 standard also specifies the potassium oxide (K₂O) content, which must be ≥33.2%. If this requirement is not met, the product is considered unqualified, even if the KH₂PO₄ content seems acceptable.
**Price Consideration**: Due to its high nutrient concentration, authentic potassium dihydrogen phosphate tends to be more expensive. If you encounter a product with an unusually low price, it may be counterfeit or of poor quality. Always purchase from reliable suppliers and check for proper certification.
**Agricultural Science and Technology Newspaper**
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*Note: This information is intended to help buyers make informed decisions when purchasing potassium dihydrogen phosphate. Always verify the product specifications and source before making a purchase.*rubber seals, uses of rubber seals
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