Industrial difluorodichloromethane (F12) (3)

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The sample is boiled, and the mass of the residue at Gaozhou point is weighed to obtain the content of the evaporation residue

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Figure 3 Weighing tube and evaporation tube

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Washing liquid: dichloromethane (analytical grade)

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After drying the weighing tube in an electric heating blast box at 105±2°C for 30 minutes, cool it in a desiccator, weigh it up to 0.

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The evaporation residue W (%) is calculated according to formula (2):

Where: m ₀ -the mass of the weighing tube, g;

m1—The mass of the weighing tube after vaporizing the sample, g;

m—the mass of the sample, g

3 Inspection rules

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3 Each batch of ex-factory products should be accompanied by a quality certificate, which should indicate: product name, manufacturer name, production date, batch number, net production weight, product quality standard or current standard number
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4 If one of the test results does not meet this standard, it shall be re-inspected from twice the volume of the packaging unit (steel cylinder) sample
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Even if only one index does not meet the requirements of this standard in the re-inspection result, the whole batch will be treated as non-conforming product
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5 Sampling:

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1 The sampler uses a small steel cylinder or composite material (metallic material on the inner wall) airbag, and the sampler and connecting pipe must be kept dry
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2 Connect the sampler, the pipe and the F12 steel cylinder to be tested, open the valve of the steel cylinder, so that the liquid phase sample enters the sampler, the sample is replaced no less than 3 times, and the analysis is performed immediately after sampling
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The sampler can be equipped with a cooling device or be cryogenically cooled before sampling
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3 This product is produced in batches per tank
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The same batch of products should be of the same grade
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4 Take 5% of the total number of steel cylinders packaged in each batch of difluorodichloromethane , with at least two bottles
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6 Under the condition of normal production and stable quality, acidity and evaporation residues are sampling inspection indicators, which can be sampled 1 to 2 times a month, if the user has special requirements, additional inspections can be made
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4 Packaging, marking, storage and transportation

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1 This product is packaged in steel cylinders.
The cylinders are coated with aluminum white paint, stamped with a steel stamp, and black paint is used to indicate the product name and tare weight
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2 The packaging quantification standards and regular inspections of steel cylinders shall be carried out in accordance with the “Cylinder Safety Supervision Regulations” (79) No.
18 "Cylinder Safety Supervision Regulations" of the State Administration of Labor (79), and the filling factor shall not exceed 1.
14kg/L
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4.
3 This product should be stored in a cool and dry place, not close to heat sources, and selenium rain is strictly prohibited
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4 Steel cylinders containing wood products are pressurized containers.
Impact, drag, drop and direct exposure are strictly prohibited during loading and unloading, and should comply with the relevant regulations of the People's Republic of China on the transportation of dangerous goods by railways and highways
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5 It is necessary to ensure that the packaging container is dry and clean, free of other impure gases and maintain a positive pressure
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