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D1845-86 – Standard Test Method Technical Guide
📐 Scope and Significance
These test methods are established for the chemical analysis of strontium chromate pigment. They may be used to confirm the stated strontium oxide and chromium oxide content. The standard is under the jurisdiction of ASTM Committee D01 on Paint and Related Coatings and is approved for use by U.S. Department of Defense agencies. Analytical procedures covered include determination of strontium, chromium, chloride, sulfate, moisture, coarse particles, mass color, and tinting strength.
⚙️ Apparatus and Reagents
Essential apparatus includes a Gooch crucible and an electric furnace capable of 800°C. Reagent grade chemicals conforming to ACS specifications shall be used. Water refers to Type II of Specification D1193. Sample preparation requires mixing thoroughly and passing through a No. 325 (4‑µm) sieve.
| ⚡ Apparatus | 📏 Specification |
|---|---|
| Gooch Crucible | Standard filtering crucible |
| Electric Furnace | Capable of 800°C |
| Sieve | No. 325 (4‑µm) |
📊 Analytical Procedures
The standard outlines the following procedures in the order presented:
| 🟦 Procedure | 📏 Sections | 🎯 Key Reagent / Aspect |
|---|---|---|
| Strontium by Strontium Sulfate Method | 7‑10 | Acetic Acid (glacial) |
| Chromium by Thiosulfate Method | 11‑14 | Thiosulfate |
| Chloride Content | 15 | — |
| Sulfate Content | 16 | — |
| Moisture and Other Volatile Matter | 17 | Per Test Methods D280 |
| Coarse Particles | 18 | Per Test Methods D185 |
| Mass Color and Tinting Strength | 19 | Per Test Methods D387 |
⚠️ Ensure all reagents are of high purity. Reagent grade chemicals conforming to ACS specifications are required unless it is first verified that the reagent is sufficiently pure for use without lessening determination accuracy.
✅ Always use Type II water conforming to Specification D1193 for all test methods unless otherwise indicated in the procedure.
❓ Frequently Asked Questions
🔍 What does D1845‑86 cover?
It provides test methods for the chemical analysis of strontium chromate pigment, including determination of strontium, chromium, chloride, sulfate, moisture, coarse particles, mass color, and tinting strength.
💡 What type of water is specified?
Type II water as defined in Specification D1193.
⚡ What furnace temperature is required?
An electric furnace capable of reaching and maintaining 800°C.
📌 How should the sample be prepared?
The sample must be mixed thoroughly and passed through a No. 325 (4‑µm) sieve before analysis.