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GB/T 37999-2019: PDF in English (GBT 37999-2019)
GB/T 37999-2019
ICS 71.080.20
G 17
1,1,1,3,3-Pentafluoropropane (HFC-245fa) for
industrial use
Issued by: State Administration for Market Regulation;
Standardization Administration of the People's Republic of
Table of Contents
Foreword ... 3 
1 Scope ... 4 
2 Normative references ... 4 
3 Requirements ... 5 
4 Test methods ... 6 
5 Inspection rules ... 12 
6 Marks, packaging, transportation and storage ... 14 
Annex A (normative) Typical chromatogram and relative retention time of
1,1,1,3,3-pentafluoropropane content determination ... 16 
Annex B (informative) Safety ... 18 
Bibliography ... 19 
1,1,1,3,3-Pentafluoropropane (HFC-245fa) for
industrial use
WARNING - This Standard does not point out all possible safety issues.
The user is responsible for taking appropriate safety and health measures
and ensuring compliance with the conditions stipulated by relevant
national laws and regulations.
1 Scope
This Standard specifies the requirements, test methods, inspection rules, marks,
packaging, transportation and storage for 1,1,1,3,3-pentafluoropropane (HFC-
245fa) for industrial use (HFC-245fa, also called R245fa).
This Standard is applicable to 1,1,1,3,3-pentafluoropropane synthesized from
vinyl chloride, carbon tetrachloride and hydrogen fluoride as raw materials. The
products are mainly used in foaming agents and refrigerants.
Molecular formula: C3H3F5
Structural formula:
Relative molecular mass: 134.05 (according to 2016 international relative
atomic mass)
2 Normative references
The following referenced documents are indispensable for the application of
this document. For dated references, only the edition cited applies. For undated
references, the latest edition of the referenced document (including any
amendments) applies.
GB/T 191, Packaging and storage marks
4 Test methods
WARNING - Some test procedures specified in this Standard may lead to
dangerous situations, and users should take appropriate safety and health
protection measures.
4.1 General
The reagents and water used in the test method refer to the reagents confirmed
to be analytically pure, and grade three water specified in GB/T 6682 when no
other requirements are indicated.
4.2 Determination of appearance
Pour about 10mL of liquid specimen from the outlet of the sampling cylinder into
a 50mL dry colorimetric tube. Wipe off the frost or moisture attached to the outer
wall of the test tube with a dry cloth. Observe the color of the specimen and the
presence or absence of visible solid particles in a lateral perspective.
4.3 Determination of 1,1,1,3,3-pentafluoropropane content
4.3.1 Method summary
Use gas chromatography. Under selected chromatographic conditions, the
specimen is vaporized and passed through the chromatographic column to
separate the components. Use a hydrogen flame ionization detector to detect.
The content of 1,1,1,3,3-pentafluoropropane is calculated by the corrected area
normalization method.
4.3.2 Reagents or materials Nitrogen: The volume fraction is greater than 99.995%. Hydrogen: The volume fraction is greater than 99.995%. Air: Dried and purified by silica gel or molecular sieve.
4.3.3 Instruments and equipment Gas chromatograph: Equipped with a flame ionization detector (FID) for
capillary column analysis. The sensitivity of the whole machine shall meet the
requirements of GB/T 9722. The linear range meets the analysis requirements. Recorder: Chromatography workstation or processor. Injector: 1mL gas-tight syringe or automatic injection valve. Sampling cylinder: Double-valve type stainless-steel small cylinder. The Take a screw-top sample bottle with septum. Insert the injection
needle into the septum to release the pressure in the bottle. In the order of
boiling point from high to low, use a syringe to sequentially add the exact mass
of impurity components to the sample bottle. After adding, shake well. Put on a
label. Store in a refrigerator below 10°C for future use. This sample is a liquid
mixed sample.
NOTE: The impurity component refers to the component in the specimen whose boiling
point is higher than that of 1,1,1,3,3-pentafluoropropane. Use background sample 1,1,1,3,3-pentafluoropropane to repeatedly
replace the air in the gas cylinder. Vacuum again. Introduce the background
sample in the liquid phase to the gas cylinder. Slightly over exceed. Balance to
normal pressure after complete vaporization. Use a syringe to add a certain
volume of each impurity component gas one by one. Quantitatively add the
liquid in the sample bottle to the gas bottle. Make the amount of each
impurity close to the composition of the test sample. Equilibrate for
20min~30min to completely vaporize each component. After being evenly
mixed, it is the sample for calibration. Take a certain amount of calibration
sample. Determine according to the chromatographic operating conditions
given in Table 2. The mass fraction wLi of each impurity component i in the liquid mixed
sample is calculated according to formula (1):
mLi - The mass of each impurity component liquid added to the screw-top
sample bottle, in grams (g). The mass mi of the impurity component i in the liquid mixed sample
added to the calibration sample, in grams, is calculated according to formula
m0 - The mass of the liquid mixed sample added to the calibration sample, in
grams (g);
wLi - The mass fraction of each impurity component i in the liquid mixed sample.
f1 - The relative mass correction factor of 1,1,1,3,3-pentafluoropropane;
A1 - The peak area of 1,1,1,3,3-pentafluoropropane;
fi - The relative mass correction factor for component i;
Ai - The peak area of component i.
Take the arithmetic average of two parallel determination results as the report
result. The absolute difference between the two parallel determination results
of 1,1,1,3,3-pentafluoropropane is not more than 0.01%.
4.4 Determination of moisture
Determine according to the provisions of GB/T 7376-2008 5.3.
Take the arithmetic average of the two parallel determination results as the
report result. When the moisture content is ≤0.0005%, the absolute difference
between the two parallel determination results is not more than 0.0002%. When
0.0005%< moisture content≤0.0020%, the absolute difference between the two
parallel determination results is not more than 0.0003%. When the moisture is
greater than 0.0020%, the absolute difference between the two parallel
determination results is not greater than 10% of the arithmetic mean of the two
determination values.
4.5 Determination of acidity (as HCl)
Carry out according to the method specified in 5.4.2 of GB/T 33065-2016.
4.6 Determination of evaporation residue
Carry out according to the method specified in 5.4.2 of GB/T 33066-2016.
4.7 Chloride (Cl-) test
According to the regulations in GB/T 31401. The specimen size is about 33g±1g.
4.8 Determination of non-condensable gases in the gas phase
According to the regulations in GB/T 31400.
5 Inspection rules
5.1 Type inspection
All items specified in the requirements of this Standard are type inspection items.
Under normal production conditions, type inspection shall be carried out at least
once a month. Type inspection shall also be carried out in one of the following
a) When updating the key production process, and the main raw materials
have changed;
b) When production is stopped and resumed;
c) When a major quality accident occurs;
d) When there is a big difference between the exit-factory inspection result
and the last type inspection;
e) When the quality supervision agency requests it in accordance with the
5.2 Exit-factory inspection
The appearance, 1,1,1,3,3-pentafluoropropane, and moisture in the
requirements of this Standard are exit-factory inspection items.
5.3 Batching
1,1,1,3,3-pentafluoropropane for industrial use takes the products of uniform
mass as a batch. One batch of steel bottled products shall be no more than 50t,
or one batch of products is in one storage tank and one tank car.
5.4 Sampling
5.4.1 The sampling of 1,1,1,3,3-pentafluoropropane for industrial use shall be
carried out in accordance with the provisions of 7.10 in GB/T 6681-2003. The
total amount of sampling shall meet the needs of inspection.
5.4.2 The sampling cylinder and sampling tube shall be vacuum dried. The
sample shall enter the sampling cylinder in the liquid phase. Use the drain valve
of the sampling cylinder tube to adjust the sample volume. The sampling
volume shall not exceed the allowable filling volume of the cylinder.
5.4.3 Label the sampling cylinder, indicating the product name, batch number,
sampling date and the name of the sampler for inspection.
5.4.4 The number of sampling units of steel bottle packaging products shall
meet the requirements of Table 3.
and shall comply with TSG R4002.
6.2.2 1,1,1,3,3-pentafluoropropane for industrial use shall be packaged by
special steel bottle. Reusable steel cylinders are coated with aluminum white
paint. Mark the product name and tare weight with black paint.
6.2.3 Each batch of industrial 1,1,1,3,3-pentafluoropropane shall be
accompanied by a quality certificate in a certain format. The content shall
a) Name of the manufacturer;
b) Product name and model;
c) Production date or batch number;
d) Product quality inspection results or inspection conclusions;
e) Reference of this Standard.
6.2.4 When filling steel cylinders, it shall meet the requirements of GB/T 14193.
The filling factor of 1,1,1,3,3-pentafluoropropane is not more than 1.16kg/L.
Post filling signs as required.
6.2.5 The cylinder used for the first time shall be kept dry and clean. For
reusable steel cylinders, positive pressure shall be maintained in the cylinder
after the product is used.
6.3 Transportation
Steel cylinders and tank trucks containing 1,1,1,3,3-pentafluoropropane are
pressure vessels. In the process of loading and unloading transportation, it shall
be lightly loaded and unloaded. Shock, drag, drop and direct exposure are
strictly prohibited. Safety helmets should be worn for repetitive steel cylinders.
The transportation process shall comply with the relevant regulations of the
People's Republic of China on the transportation of dangerous goods by
railways and highways. It shall be accompanied by a "chemical safety technical
specification" and a "chemical safety label".
6.4 Storage
1,1,1,3,3-pentafluoropropane for industrial use shall be stored in a cool, dry
place, away from heat sources, and strictly prohibited from sunlight and rain.

Standard ID GB/T 37999-2019 (GB/T37999-2019)
Description (Translated English) 1,1,1,3,3-Pentafluoropropane(HFC-245fa) for industrial use
Sector / Industry National Standard (Recommended)
Classification of Chinese Standard G17
Classification of International Standard 71.080.20
Word Count Estimation 14,132
Date of Issue 2019-08-30
Date of Implementation 2020-07-01
Drafting Organization Zhejiang Quhua Fluorine Chemical Co., Ltd., Sinochem Lantian Honeywell New Materials Co., Ltd., Zibo Aohong Chemical Technology Co., Ltd., Shandong Dongyue Chemical Co., Ltd., China Petrochemical Corporation Beijing Chemical Research Institute, Quzhou Fluorosilicon Technology Research Institute, Zhejiang Juhua Testing Technology Co., Ltd.
Administrative Organization National Chemical Standardization Technical Committee (SAC/TC 63)
Proposing organization China Petroleum and Chemical Industry Federation
Issuing agency(ies) State Administration for Market Regulation, China National Standardization Administration