Physical Address
304 North Cardinal St.
Dorchester Center, MA 02124
D5439-95 – Standard Test Method Technical Guide
ASTM D5439-95 (Reapproved 2019) outlines a standardized test method for determining toluene insoluble sediment in Moellon. Derived from Test Method D473, this method uses solvent extraction to quantify sediment, critical for quality control in petroleum products. Results are reported in SI units, and users must follow safety guidelines.
⚙️ Apparatus and Specifications
The extraction apparatus includes a 1-L wide-neck Erlenmeyer flask, a metal coil condenser, an extraction thimble, and a thimble basket. Key specifications are listed below:
| 🟦 Component | 📏 Specification | 🎯 Requirement |
|---|---|---|
| Extraction Flask | Wide-neck Erlenmeyer | 1 L capacity |
| Condenser Coil | Metal coil, 25 mm diameter, 50 mm length | Outside diameter: 5-8 mm, wall thickness: 1.5 mm |
| Tin Coating | For copper or brass base | Minimum thickness: 0.075 mm |
| Extraction Thimble | Refractory porous, pore size index P15 | 25 mm diameter, 70 mm height, weight 15-17 g |
| Water Cup | Glass, conical | 20 mm diameter, 25 mm deep, capacity ~3 mL |
The condenser coil exposure surface area is approximately 115 cm². The thimble basket must be corrosion-resistant and made of platinum, stainless steel, or similar materials as per Fig. 2. The water cup is used for high-water-content samples to avoid interference.
💡 Technical Tip: Verify that the thimble weight and dimensions are within specified ranges to ensure proper extraction efficiency. Use boiling chips to maintain even solvent boiling.
📊 Test Method and Significance
This test method determines toluene insoluble sediment in Moellon by extraction. The sample is loaded into the thimble, and toluene meeting ISO 5272 is used as the solvent. The residue after extraction is weighed to calculate sediment content. The method is derived from ASTM D473 and references D4057 and D4177 for sampling.
Values are expressed in SI units, and it is the user’s responsibility to establish safety and environmental practices. The standard emphasizes compliance with regulatory limitations.
⚡ Critical Note: Always perform the test in a well-ventilated area due to the use of toluene. Ensure proper disposal of hazardous waste. The standard does not cover all safety concerns, so assess risks before use.
❓ Frequently Asked Questions
🔍 What is the scope of D5439-95?
It covers the determination of toluene insoluble sediment in Moellon, useful for quality assessment of this petroleum product.
💡 What are the condenser requirements?
The condenser is a metal coil with specific dimensions: 25 mm diameter, 50 mm length, tube OD 5-8 mm, and wall thickness 1.5 mm. Tin coating must be at least 0.075 mm thick if on copper or brass.
⚡ Why is the water cup necessary?
The water cup is used when testing samples with high water content to prevent water from interfering with the extraction process.
📌 Which standards are referenced in D5439-95?
It references ASTM D473, D4057, D4177, and ISO 5272 for method derivation and sampling procedures.