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D5400-15 – Standard Test Method Technical Guide
ASTM D5400-15 (Reapproved 2021) provides standardized test methods for evaluating hydroxypropylcellulose. These methods are under the jurisdiction of ASTM Committee D01 on Paint and Related Coatings. The procedures cover five key properties: moisture content, viscosity, pH, residue on ignition, and hydroxypropoxy content. Values stated in SI units are the standard.
📐 Scope and Key Test Methods
The standard outlines the testing of hydroxypropylcellulose through the following specific sections:
| 🔬 Test Method | 📏 Sections | 🎯 Key Detail |
|---|---|---|
| Moisture Content | 4 – 9 | Volatile content at 105 ± 3°C |
| Viscosity | 10 – 16 | Standard viscosity method |
| pH | 17 – 21 | Ref. ASTM E70 (Glass Electrode) |
| Residue on Ignition | 22 – 28 | See safety details in Section 26.6 |
| Hydroxypropoxy Content | 29 – 36 | Ref. ASTM D3876 (Gas Chromatography) |
⚙️ Detailed Procedure: Moisture Determination
The moisture content is used to calculate total solids and active polymer in the material. The procedure is critical for formulation calculations.
Apparatus
| 🔧 Apparatus | 📐 Specification |
|---|---|
| Oven | Gravity convection, 105 ± 3°C |
| Weighing Dish | Glass or aluminum, 50 mm x 25 mm, with cover |
| Balance | Analytical |
Procedure
Weigh approximately 5 g of the sample to the nearest 0.001 g in a tared, covered weighing dish. Dry to a constant weight in the oven.
💡 Expert Tip: Always use distilled water (Section 3.2) and ACS reagent grade chemicals (Section 3.1) to prevent impurities from skewing your moisture, pH, or viscosity results.
🧪 Hydroxypropoxy Content and Reagents
The determination of hydroxypropoxy substitution is performed using gas chromatography as outlined in ASTM D3876. The standard stresses the use of Reagent grade chemicals for all tests.
⚠️ Important Safety Reminder: ASTM D5400 does not fully address all safety concerns, if any, associated with its use. Per Section 26.6, specific hazard statements exist for the Residue on Ignition test. Users must establish appropriate safety, health, and environmental practices.
❓ Frequently Asked Questions
🔍 What properties does ASTM D5400 test?
It covers the testing of hydroxypropylcellulose for moisture, viscosity, pH, residue on ignition, and hydroxypropoxy content.
💡 How is the moisture test conducted?
A sample of about 5 g is weighed to 0.001 g and dried in a gravity convection oven at 105 ± 3°C. The loss in weight represents the volatile content, designated as moisture.
⚡ What is the significance of the moisture test?
It is used to calculate total solids in the sample and determines the amount of active polymer present, which is critical for formulation.
📌 Which referenced ASTM standards are used?
This standard references ASTM D3876 (Gas Chromatography for substituted cellulose ethers) and ASTM E70 (pH of aqueous solutions).