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D301-95 – Standard Test Method Technical Guide
📐 Sampling and Sample Preparation
The standard outlines specific sampling procedures for soluble cellulose nitrate. Samples must be taken from no less than 10% of the barrels in each lot, with a minimum of two barrels. Two samples of approximately 0.5 dm³ (1 pt) are collected from well-separated points at least 0.3 m (1 ft) beneath the surface and composited to represent the lot.
| 🟦 Parameter | 📏 Requirement |
|---|---|
| Sampling frequency | ≥ 10% of barrels (minimum 2 barrels per lot) |
| Sample volume | Approximately 0.5 dm³ (1 pt) per sample |
| Sampling depth | At least 0.3 m (1 ft) beneath surface |
Samples must be dried before testing, as per Section 4. The material is flammable and requires careful handling.
⚙️ Test Methods and Procedures
This standard covers various test methods including ash determination (Sections 5-7), nitrogen content (Sections 8-10), stability (Sections 11-13), viscosity (Sections 14-18), and toluene dilution (Sections 22-24). Viscosity is tested using the ball-drop method per Test Method D1343, while nitrogen can be determined via Test Method D4795.
| 🎯 Property | ⚡ Test Method |
|---|---|
| Ash | Sections 5-7 |
| Nitrogen | Sections 8-10; Alternative D4795 |
| Stability (134.5°C) | Sections 11-13 |
| Viscosity | Sections 14-18; Ball-drop per D1343 |
| Toluene Dilution | Sections 22-24 |
The stability test is conducted at 134.5°C, with a minimum requirement of 25 minutes. Detailed procedures are specified in the standard.
⚠️ Safety Alert: Soluble cellulose nitrate is highly flammable, especially when dry. Always wet with water or alcohol during handling and storage. See specific hazard statements in Sections 12.2, 13.3, 16.1, and 16.2.
📊 Key Specifications and Quality Criteria
The standard defines acceptance criteria for soluble cellulose nitrate based on various properties. These are calculated on a dry-weight basis and must meet the following requirements:
| 📐 Property | 📏 Specification |
|---|---|
| Appearance | No discoloration, free from lumps and foreign matter |
| Ash content | ≤ 0.30% |
| Nitrogen content | Within agreed limits per type |
| Stability (134.5°C) | ≥ 25 minutes |
| Viscosity | Within agreed limits per type |
| Toluene dilution | Equivalent to reference standard |
All specimens must meet the solubility and film test requirements equivalent to the reference standard for the specific type.
💡 Technical Tip: Viscosity testing using the ball-drop method (D1343) requires precise temperature control. Ensure the specimen is at equilibrium before measurement.
❓ Frequently Asked Questions
🔍 What is the purpose of the toluene dilution test?
The toluene dilution test evaluates the solubility behavior of cellulose nitrate, ensuring it meets the performance required for coating applications.
💡 How is the nitrogen content determined?
Nitrogen content is measured using methods detailed in Sections 8-10 or the alternative method D4795. It is calculated on a dry-weight basis and must fall within agreed limits.
⚡ Why is stability important?
Stability at 134.5°C indicates the thermal resistance of cellulose nitrate, with a minimum of 25 minutes ensuring safe handling and storage.
📌 What are the safety precautions for handling?
Cellulose nitrate is flammable and should be kept wet with water or alcohol. Refer to hazard statements in Sections 12.2, 13.3, 16.1, and 16.2.