JC 936-2004 English PDF (JC936-2004)
JC 936-2004 English PDF (JC936-2004)
See Chinese contents: JC 936-2004
JC 936-2004: [JC/T 936-2004] One-component polyurethane foam
BUILDING MATERIAL INDUSTRY STANDARD
OF THE PEOPLE’S REPUBLIC OF CHINA
Registration number. 14592-2004
One-component polyurethane foam
ISSUED ON. OCTOBER 20, 2004
IMPLEMENTED ON. APRIL 01, 2005
Issued by. National Development and Reform Commission of PRC
Table of Contents
Foreword ... 3
1 Scope ... 4
2 Normative references ... 4
3 Classification ... 5
4 Raw materials ... 5
5 Technical requirements ... 5
6 Preparation of specimen and test piece ... 6
7 Test methods ... 11
8 Inspection rules ... 13
9 Marking, packaging, transportation, storage ... 15
Appendix A (Informative) Method for detecting chlorofluorocarbons (CFCs) in one-component polyurethane foam sealant ... 17
One-component polyurethane foam
This standard specifies the classification, raw materials, technical requirements, preparation of specimens and test pieces, test methods, inspection rules, marking, packaging, transportation and storage of single-component
polyurethane foam sealants.
This standard applies to aerosol-filled one-component polyurethane foam sealant which uses the polyol and polyisocyanate as main raw materials
(hereinafter referred to as PU sealant).
2 Normative references
The provisions in following documents become the provisions of this standard through reference in this standard. For the dated references, the subsequent amendments (excluding corrections) or revisions do not apply to this standard; however, parties who reach an agreement based on this standard are
encouraged to study if the latest versions of these documents are applicable. For undated references, the latest edition of the referenced document applies. GB/T 6343 Cellular plastics and rubbers - Determination of apparent (bulk) density (GB/T 6343-1995, neq ISO 845.1988)
GB 8624-1997 Classification on burning behavior for building materials
GB/T 8626 Test method of flammability for building materials
GB/T 8811 Test method for dimensional stability of rigid cellular plastics (GB/T 8811-1988, idt ISO 2796.1980)
GB/T 10294 Thermal insulation - Determination of steady-state thermal
resistance and related properties - Guard hot board apparatus (GB/T 10294- 1988, eqv ISO/DIS 8302)
GB 13042 Packing containers - Aerosol cans
GB/T 13520 Unplasticized polyvinyl chloride extruded boards
State Environmental Protection Administration (former), etc. HK 
No.366 Notice on the prohibition of the use of chlorofluorocarbons in the aerosol industry
3.1 PU sealants are classified into grades B2 and B3 according to the
combustion performance grade, as shown in clauses 5.2 and 5.3 of GB 8624- 1997.
3.2 PU sealants are divided into gun type (Q) and tube type (G) according to the packaging structure.
3.3 Product’s marking
The product is marked in the following order. name, combustion performance grade, packaging structure, standard number.
Example. A grade B2 gun-type one-component polyurethane foam sealant is marked as. one-component polyurethane foam sealant B2 Q JC 936-2004.
4 Raw materials
The raw materials of PU sealant shall comply with the provisions of the HK  No.366 from the Environmental Protection Administration (former). It is prohibited to use CFCs1.
5 Technical requirements
The PU sealant is a liquid in the aerosol can, the ejected material is a foam of uniform color, without undispersed particles and impurities. It is a rigid foam- plastic having uniform cells after curing.
5.2 Physical properties
The physical properties of PU sealant shall be in accordance with the provisions of Table 1.
1 Note. CFCs. It refers to foaming agent monofluoromethylene chloride (F-11), difluoromethylene chloride (F-12) trifluorotrichloroethane (F-113) which may be used in PU sealant.
7 Test methods
Perform visual inspection at the time of preparation of the test piece. 7.2 Density
It is performed according to the provisions of GB/T 6343.
7.3 Dimensional stability
It is performed according to the provisions of GB/T 8811. The test conditions are (23 ± 2) °C. Perform test 72 h after preparing test piece.
7.4 Thermal conductivity
It is performed according to the provisions of GB/T 10294. The average
temperature at the test point is 35 °C.
It is performed according to the provisions of GB/T 8626. Use edge ignition. 7.6 Tensile bond strength
It may select one or more substrates in 18.104.22.168.
7.6.1 Test equipment
22.214.171.124 Tensile testing machine. The accuracy is not more than 2 N, the load ranges (0 ~ 1000) N, it is equipped with a dedicated tensile fixture, the tensile speed can be adjusted to 5 mm/min.
126.96.36.199 Vernier caliper. The accuracy is 0.02 mm.
188.8.131.52 Constant-temperature bath. The volume can accommodate the test
piece, the controllable temperature is (23 ± 1) °C.
7.6.2 Test procedures
184.108.40.206 Tensile bond strength under standard conditions
Remove the pad from the test piece which has been prepared and cured
according to 220.127.116.11. Use the vernier caliper to measure the size of the bonded part. Load it into the tensile machine, stretch the fixture until it is damaged. Record the damage load (N) and the state of destruction.
τ - Shear strength, in kilocalories (kPa);
F - Damage load, in Newtons (N);
L - Length of the bonded part of the test piece, in millimeters (mm);
b - Width of the bonded part of the test piece, in millimeters (mm).
The test results take the arithmetic mean of the five test pieces, accurate to the integer position.
7.8 Foaming multiple
According to the provisions of 6.2.2, inject in layers the sample materials from an aerosol can into the formwork which has an inner size of 400 mm x 400 mm x 600 mm. Empty the aerosol can. After 72 h, use a balance which has an accuracy of 0.1 g to weigh the mass (M) of the foam block. Then, respectively from the upper, middle, lower parts of the foam block, take 5 specimens in total. Follow the provisions of 7.2 to determine the density of the foam specimen (ρ). Use its average value to calculate the volume of the foam block (Vf). Use the formula (3) to calculate the foaming multiple, accurate to the integer position. Where.
f - Foaming multiple;
Vf - The volume of the foam block, in liters (L);
M - The mass of the foam block, in grams (g);
ρ - The density of the foam block, in kilograms per cubic meter (kg/m3); V0 - The indicated capacity of aerosol can, in liters (L).
8 Inspection rules
8.1 Classification of inspections
8.1.1 Exit-factory inspection
The manufacturer shall, according to the provisions of this standard, perform exit-factory inspection for each batch of products. The exit-factory inspection When the appearance quality does not meet the requirements of 5.1, the batch of products is judged to be unqualified.
In the inspection results, if two or more items fail, the batch of products is judged to be unqualified. If one item fails, it is allowed to double the specimen from the same batch of products for single item re-inspection. If it still fails, the batch of products is judged as unqualified.
9 Marking, packaging, transportation, storage
The outer packaging of each product shall be marked with the following. a) Name of product;
b) Label of product;
c) Net capacity and foaming multiple;
d) Date of manufacture, shelf life;
f) Name and address of the factory;
g) Hazardous substances and signs of flammable products;
h) Method of use;
i) Safety precautions.
9.2.1 Packaging materials
The product is packed in pressure-resistant metal can. Its technical
performance shall meet the requirements of GB 13042, wherein the
deformation pressure is not less than 1.5 MPa, the burst pressure is not less than 1.8 MPa.
9.2.2 Packing specifications
Specifications can be. 250 ml/piece, 500 ml/piece, 600 ml/piece, 750 ml/piece. It can also be determined according to the user’s needs.
Method for detecting chlorofluorocarbons (CFCs) in one-component
polyurethane foam sealant
A.1 Scope of application
The method is suitable for the detection of chlorofluorocarbons (CFCs) in aerosol canned one-component polyurethane foam sealant.
A.2 Principles of test
Based on the high-efficiency separation ability of the gas chromatography for the mixture as well as the accurate identification capability of the mass spectrometer for the purified material, use the gas chromatographic-mass spectrometer to qualitatively analyze the components of gas which is extracted from the aerosol can.
A.3 Test equipment
A.3.1 Gas chromatography-mass spectrometer
Gas chromatographic conditions. Quartz capillary column, carrier gas is high- purity nitrogen, column temperature is 40 °C, perform test under constant- temperature. The temperature at the sample inlet is 100 °C, the pre-column pressure is 110 kPa.
Mass spectrometry conditions. EI ion source, electron energy 70 ev, ion source temperature 150 °C, electron multiplier voltage 1.2 kV, detection mode is full scanning.
Rubbery, covered with aluminum foil thermal insulation layer, for sampling of gas specimens.
2 ml, which is used for extracting gas from the airbag.
A.4 Sampling of gas
Place the aerosol can which is filled with the specimen upright. Place it in a constant-temperature test chamber at 25 °C for 24 h. Carefully install the gun