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2.
2.
The sample is evaporated, and the mass of the high-boiling residue is weighed to obtain the evaporation residue content
2.
2.
2.
2.
2.
Washing liquid: dichloromethane (analytical grade)
2.
Dry the weighing tube in an electric heating blast box at 105±2℃ for about 30 minutes, then cool it in a desiccator, weigh to 0.
2.
The thermal residue W (%) is calculated according to formula (2):
Where: m 0 -the mass of the weighing tube, g;
m 1 —The mass of the weighing tube after vaporizing the sample, g;
m—the mass of the sample, g
3 Inspection rules
3.
3.
3.
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, product net weight, product quality standard or current standard number
.
3.
4 If one indicator of the inspection result does not meet this standard, samples should be taken from twice the volume of the packaging unit (steel cylinder) for re-inspection.
Even if only one indicator does not meet the requirements of this standard, the entire batch of products will be Qualified product processing
.
3.
5 Sampling:
3.
5.
1 The sampler uses a small steel bottle or a small-mouth glass bottle with a stopper
.
The sampler and connecting pipe must be kept dry
.
3.
5.
2 Connect the sampler, the pipe and the tested F11 steel cylinder, open the cylinder valve to make the liquid sample enter the sampler, replace the sample for no less than 3 times, and analyze it immediately after sampling (when the temperature is high, the sample should be taken with Cooling device)
.
3.
5.
3 This product takes each tank produced as a batch, and the same batch of products should be of the same grade
.
3.
5.
4 Sampling shall be 5% of the total number of steel cylinders packaged with one fluorochloroform per batch , and the minimum shall be no less than two bottles
.
3.
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, it can be inspected
.
4 Packaging, marking, storage and transportation
4.
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
.
4.
2 Technical inspections of steel cylinders must be carried out regularly, and the steel cylinders containing this product are inspected every three years
.
4.
3 The filling factor is not more than 1.
25kg/L
.
4.
4 This product should be stored in a cool and dry place, not close to heat sources, and strictly prohibited from sun and rain
.
4.
5 The steel cylinder containing this product is a pressurized container.
During loading and unloading, it is strictly forbidden to hit, drag, drop, and directly expose it, and should comply with the relevant regulations of the People's Republic of China on the transportation of dangerous goods by railways and highways
.
4.
6 It is necessary to ensure that the packaging container is dry and clean, free of other impure gases, and maintain a positive pressure
.
Related Links: Industrial Monofluorochloroform (F11) (1)