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D538-85 – Standard Test Method Technical Guide
🧪 Product Types and Chemical Composition
Trisodium phosphate is a white, uniform product suitable for washing, cleaning, and scouring processes where a moderately strong alkaline material is desired. It is available in three types specified by the purchaser based on hydration and physical form:
| 🟦 Type | 📏 Description | 📐 Approximate Formula |
|---|---|---|
| I | Anhydrous powder or granules | Na₃PO₄ |
| II | Granular material | Na₃PO₄·H₂O |
| III | Flake or crystalline material | Na₃PO₄·12H₂O |
This material may be hazardous if not properly managed. Users should obtain precautionary information for safe use, storage, and disposal from suppliers.
⚠️ Warning: In case of personal accident, apply appropriate first aid, telephone the nearest Poison Control Center for assistance, and get medical attention immediately.
⚙️ Ordering Information and Weight Calculation
Trisodium phosphate is purchased by net weight. However, due to possible weight gain or loss from atmospheric conditions, the net weight is calculated based on a product containing 97% of trisodium phosphate. The payable net weight (W) is determined by the formula:
W = (R × T) / 97
Where W is the net weight to be paid for, R is the net weight as received, and T is the total trisodium phosphate calculated as Na₃PO₄ for Type I, Na₃PO₄·H₂O for Type II, or Na₃PO₄·12H₂O for Type III.
| 🟦 Parameter | ⚡ Specification |
|---|---|
| Basis for net weight | 97% trisodium phosphate |
| Sampling and testing | In accordance with ASTM D501 |
💡 Tip: If the calculation results in a figure greater than 100%, the seller waives the right to invoice the purchaser for any amount in excess of 100%.
❓ Frequently Asked Questions
🔍 What are the three types of trisodium phosphate specified in ASTM D538-85?
The standard specifies Type I (anhydrous powder or granules), Type II (granular material approximately Na₃PO₄·H₂O), and Type III (flake or crystalline material approximately Na₃PO₄·12H₂O).
💡 How is the net weight for trisodium phosphate calculated?
The net weight to be paid for (W) is calculated using the formula W = (R × T) / 97, where R is the net weight as received and T is the trisodium phosphate content based on the specific type.
⚡ What safety precautions are recommended for handling trisodium phosphate?
Obtain precautionary information from suppliers for safe use, storage, and disposal. In case of accident, apply first aid and contact a Poison Control Center immediately.
📌 How should trisodium phosphate be sampled and tested?
Sampling and chemical analysis must be performed in accordance with ASTM Standard Test Methods D501 for alkaline detergents.