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D363-90 – Standard Test Method Technical Guide
📘 Scope and Intended Use
ASTM D363-90 (Reapproved 2000) defines the standard specification for Tricresyl Phosphate (99.0% grade) manufactured from commercial cresylic acid. This specification is essential for the paint, varnish, lacquer, and related coatings industries, where the material serves as a plasticizer, flame retardant, and chemical intermediate. Compliance ensures a high-purity product suitable for demanding chemical formulations.
⚠️ Safety First: Per Section 1.2, always consult the supplier’s Material Safety Data Sheets (MSDS) for complete hazard information and safe handling guidance when working with materials covered under this specification.
⚙️ Physical and Chemical Property Requirements
To conform to D363-90, tricresyl phosphate must meet the stringent limits established in Section 3 of the standard. These properties are critical for ensuring material performance and compatibility in coating systems.
| 🧪 Property | 📐 Requirement | ⚖️ Test Method |
|---|---|---|
| Apparent Specific Gravity (20/20°C) | 1.150 – 1.180 | D268 / D4052 |
| Apparent Specific Gravity (25/25°C) | 1.147 – 1.177 | D268 / D4052 |
| Color, Pt-Co Scale (max) | 100 | D1209 |
| Volatile Matter, weight % (max) | 0.20 | D1468 |
| Potassium Permanganate Test | Pass (≥ 30 min retention)* | D1721 |
| Unsaponifiable Matter, weight % (max) | 0.50 | D1399 |
| Water Content, weight % (max) | 0.10 | D1364 |
| Acidity, mg KOH/g sample (max) | 0.10 | D1613 |
*The color of the added KMnO₄ must be retained for a minimum of 30 minutes.
📊 Key Quality Metrics: The unsaponifiable matter limit (0.5% max) and acidity limit (0.1 mg KOH/g max) serve as crucial controls. They ensure the material is free from excessive residual alcohols, phenols, or phosphoric acid that could negatively affect curing reactions and film integrity in coatings.
📜 Testing Protocols and Compliance
Sampling: Section 4 mandates that all sampling be conducted in accordance with Practice E 300 for Sampling of Industrial Chemicals, ensuring representative and reliable test results.
Packaging: Package sizes must be mutually agreed upon by the purchaser and supplier. According to Section 6, the packaging must comply with applicable carrier rules and regulations. When explicitly specified in the purchasing contract, packaging must conform to U.S. Federal Specification PPP-C-2020 (Chemicals, Liquid, Dry, and Paste: Packaging of).
💡 Testing Tip: When determining apparent specific gravity, the standard allows any method accurate to the third decimal place. While Guide D268 outlines traditional hydrometer methods, utilizing Test Method D4052 with a digital density meter provides superior precision, speed, and requires a smaller sample volume.
❓ Frequently Asked Questions
🔍 What is the primary application for D363-compliant tricresyl phosphate?
This grade is primarily utilized as a plasticizer and flame retardant additive in paints, varnishes, lacquers, and related coatings. It also functions as a chemical intermediate in the production of specialized functional fluids.
💡 What does the Potassium Permanganate Test indicate about the material?
Conducted per Test Method D1721, this test measures the presence of oxidizable impurities. The strict requirement that the pink color be retained for a minimum of 30 minutes ensures a high level of chemical stability and the absence of reactive contaminants like unsaturated compounds or reducing agents.
📌 Does the standard mandate specific packaging requirements?
Yes. While the exact package size is subject to negotiation between buyer and seller (Section 6.1), the physical packaging itself must fully comply with all applicable transportation carrier regulations. Furthermore, if detailed in the procurement contract, it must strictly adhere to U.S. Federal Specification PPP-C-2020.
⚡ How is the material sampled for quality control?
Section 4 explicitly requires that sampling be performed according to Practice E 300. This practice provides standardized, safe procedures for obtaining representative samples of industrial chemicals, ensuring the integrity of subsequent compliance testing.