LBT-1B56 Asphalt Solubility Tester (New Standard)
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Description
Product Introduction
This instrument is designed and manufactured in accordance with the requirements specified in the People’s Republic of China standard GB/T 1148‑2008, “Method for Determining the Solubility of Petroleum Asphalt,” and also complies with the requirements set forth in T0607‑2025, “Asphalt Solubility Test,” as outlined in JTG 3410‑2025, “Test Procedures for Asphalt and Asphalt Mixtures in Highway Engineering.” It has been developed and produced to meet practical application needs and is suitable for determining the solubility of residues remaining after evaporation of petroleum asphalt or emulsified asphalt (it is not applicable to the determination of the solubility of modified asphalt). This makes it an ideal analytical instrument for assessing the solubility of petroleum asphalt or emulsified asphalt in industries such as petrochemicals, construction, and highway engineering.
Technical Specifications:
1. Operating voltage: 220 V; 2. Vacuum level: 0 to -95 kPa, with stepless speed control; 3. Two test stations can be controlled independently.
3. Instrument Structure: Filtration Apparatus — A glass crucible filtration apparatus, as shown in Figure T0607‑1, comprises a glass crucible, glass joints, a suction flask, filter material, and a vacuum system.
Crucible: glass crucible, with a volume of approximately 50 mL,
2. Its structure and dimensions are shown in the figure above.
3. Filter flask: 250 mL capacity, made of glass, conical, with thick walls and a side arm. Glass joint: used to secure the glass crucible to the filter flask; the upper portion fits tightly with the crucible, while the lower portion is carefully ground to ensure a tight seal with the filter flask.
4. Operating procedure: Connect the power supply, assemble the filtration flask and crucible, place the filter paper, attach the vacuum tubing and position it in the flask holder, turn on the power switch, and rotate the voltage‑adjustment knob to start vacuum filtration. The two workstations can be controlled independently.
5. Filter material: glass fiber filter paper, rapid‑flow type, with a diameter slightly larger than the filtration aperture; tested in accordance with the method specified in Appendix A of “Laboratory Sintered (Porous) Filters—Aperture Size, Grading, and Grade” (GB 11415‑1989), it meets the requirements of P4 grade and is capable of retaining particles ≥1.5 μm. The filter material shall not be reused.
6. Test solvent: One of the following reagents may be used for testing; however, trichloroethylene shall be employed for arbitration tests. (1) Trichloroethylene: chemically pure. (2) n‑Propyl bromide: chemically pure. (3) Toluene: chemically pure.
IV. Experimental Preparation
1. Prepare the asphalt specimen according to the method specified in T0602.
2. Place the filter paper in a clean crucible, rinse both the filter paper and the crucible with a small amount of solvent, and after the solvent has evaporated, dry them in an oven maintained at 105°C ± 5°C (or 130°C ± 5°C when using toluene as the solvent) for at least 30 minutes. Remove the crucible and filter paper, transfer them to a desiccator, and allow them to cool for 30 minutes ± 5 minutes. Weigh the combined mass to an accuracy of 0.1 mg. Then repeat the drying, cooling, and weighing steps until the difference between successive weighings is no greater than 0.3 mg. Record the mass of the crucible and filter paper as m1. Keep the crucible and filter paper in the desiccator for later use. Meanwhile, dry the Erlenmeyer flask and glass stirring rod to constant weight, and determine their mass m2 to an accuracy of 0.1 mg. The entire procedure should be carried out in a well-ventilated fume hood.
3. Transfer approximately 2 g of the asphalt sample into a pre‑dried Erlenmeyer flask. Weigh the flask containing the sample together with the glass stirring rod, recording the mass m3 to an accuracy of 0.1 mg. While continuously shaking the flask, add small portions of solvent until a total of 100 mL has been added, ensuring that the sample is completely dissolved. Cap the flask and allow it to stand at room temperature for at least 15 minutes. Note: For arbitration tests or when analyzing samples with high wax content, maintain the sample solution in a water bath at 38.0 °C ± 0.5 °C for 1 hour prior to filtration. Prepare the weighed filter paper, crucible, glass adapter, and Buchner funnel, and moisten the filter paper with a small amount of solvent. Tilt the Erlenmeyer flask and carefully transfer the supernatant along the glass stirring rod into the crucible, filtering through the paper while controlling the filtration rate so that the filtrate drips slowly. Perform gentle suction filtration as needed. When insoluble material becomes apparent, retain as much of it as possible in the Erlenmeyer flask until the filtrate is clear. Rinse the flask with a small volume of solvent, stir with the glass stirring rod, and transfer any asphalt adhering to the flask into the crucible. Rinse the glass stirring rod and the flask with solvent from the wash bottle until all insoluble material has been transferred to the crucible. Wash the insoluble residue in the crucible in portions with small amounts of solvent until the filtrate is colorless; then apply strong suction filtration to remove excess solvent. Remove the crucible and rinse its outer bottom edge with a small quantity of test solvent. Place the crucible, together with the filter paper and the insoluble material, in a fume hood for ventilation or in a vacuum drying oven until no trace of test solvent odor remains. Transfer the crucible, filter paper, and insoluble material to a drying oven maintained at 105 °C ± 5 °C (or 130 °C ± 5 °C when using toluene as the solvent) and dry for at least 30 minutes. Subsequently, cool the crucible in a desiccator for 30 min ± 5 min before weighing. Repeat the drying, cooling, and weighing steps, recording the mass to an accuracy of 0.1 mg, until the difference between consecutive weighings does not exceed 0.3 mg. Record this mass as m4.
Transfer the asphalt adhering to the Erlenmeyer flask into the crucible, and rinse the glass stirring rod and the Erlenmeyer flask with solvent from the wash bottle until all insoluble material in the Erlenmeyer flask has been transferred to the crucible. Wash the insoluble residue on the crucible in portions with small amounts of solvent until the filtrate is colorless; then perform vigorous vacuum filtration to remove excess solvent. Dry the Erlenmeyer flask, the glass stirring rod, and the adhering insoluble material to constant weight, record their mass, and designate it as m5. At least two parallel determinations should be performed for each sample.
V. Data Processing
The arithmetic mean of the two parallel determinations shall be taken as the result of the sample solubility test. If the solubility is greater than 99.0%, report to two decimal places; if the solubility is not greater than 99.0%, report to one decimal place.
VI. Packing List
2 glass filtration flasks, 1.250 ml each,
2. Two glass connectors
3. Two glass crucibles
4. 1 power cord
5. 1 box of filter paper
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