Some standard content:
National Standard of the People's Republic of China
Foam-in-place packaging materials
Foam-in-place packaging materials 1 Subject content and scope of application
GB/T15718—1995
This standard specifies the classification, technical requirements, test methods, inspection rules and packaging of foam-in-place packaging materials. This standard applies to polyurethane foam provided in the form of two liquid foam-in-place (FIP) systems. 2 Reference standards
GB 191
Picture mark for packaging, storage and transportation
GB265 Determination of kinematic viscosity of petroleum products
Batch-by-batch inspection counting sampling procedures and sampling tables (applicable to inspection of consecutive batches)GB 2828
GB4122
General terms for packaging
GB/T4857.2 Basic tests for packaging and transport packagesGB6388
GB 8167
GB8168
GB 8332
GB 9641
Transport packaging delivery and receipt mark
Dynamic compression test method for cushioning materials for packaging Temperature and humidity conditioning treatment
Static compression test method for cushioning materials for packaging Test method for combustion performance of foam plastics Horizontal combustion method Test method for tensile performance of rigid foam plastics GB/T14745 Test method for creep characteristics of packaging cushioning materials GB15719 On-site foaming packaging
SG233 Polystyrene foam plastic packaging materials SJ/Z3216 Protection, packaging and packing level of electronic products 3 Terminology
The terms in this standard conform to the definitions in GB4122 and are supplemented by the following terms. 3.1 Cram time
The time required from the uniform mixing of components A and B to the start of foaming. 3.2 Rise time
The time required from the uniform mixing of components A and B to the expansion of most (95%) of the foam. 3.3 Tack-free time
The time from when the A and B components are evenly mixed to when the semi-cured foam can be touched without sticking. 4 Product classification
4.11 Class—Hard
Type 1—
Ordinary strength.
High strength.
Approved by the State Administration of Technical Supervision on October 18, 1995 740
Implemented on April 1, 1996 GB/T 15718-1995
Grade A [For its cushioning characteristic curve, see Appendix A (reference) Figure A1]. Grade B [For its cushioning characteristic curve, see Appendix A (reference) Figure A2]. 4.33 Class - Semi-rigid
The cushioning characteristic curve is shown in Figure A3 of Appendix A (reference). 5 Technical requirements
5.1 Materials
The raw materials used to produce polyurethane foam shall meet the requirements of this specification. 5.1.1 Components
The components are composed of two components: A material (polymeric isocyanate) and B material (polyurethane resin). A and B materials shall be mixed in a foaming equipment that meets the requirements of the polyurethane foam-in-place packaging system according to the foaming procedure specified in GB15719. The daily components shall not contain impurities. 5.1.2 Instructions
The product manual shall be provided to the user. The manual shall at least provide the chemical and physical properties of the product, operating instructions and precautions, and shall also include the necessary pretreatment and temperature range of the chemical components before foaming. For details, see Table 1. Table 1 Material properties
1. Adjustment of processing temperature, C
2. Maximum viscosity at 25℃, count/s
3. Mixing ratio (/)
4. Emulsion time, s
5. Rise time, 5
6. Debonding time, s
7. Reaction temperature, C
8. Curing time with 90% mechanical properties, h9. Curing time to meet the compression deformation requirements of 5.6, h5.1.3 Temperature
Class 1 (hard)
16~30 (Material A)
16～30 (Material B)
1000 (Material A)
1250 (Material B)
1. 0±0. 1
Class 2 (soft)
16~32(A material)
16~32(B material)
1000(A material)
1250(B material)
16~-35(A material)
16~24(B material)
1000(A material)
1250(B material)
(semi-hard)
16~24(A material)
16-~24(B material)
1000(A material)
1250(B material)
The foam should have the properties shown in Table 1. Unless otherwise specified, the ambient temperature for the listed properties is 20℃~30℃. 5.1.4 Toxicity
The ingredients shall not contain toluene diisocyanate (TDI) and TDI derivatives, methylene fluoride (chloromethane) or any substance suspected of being a carcinogen. The absence of toluene diisocyanate and its derivatives shall be determined before the initial mixing of the ingredients for the first product test. 5.2 Density
When necessary, the density of the foam-in-place material shall be specified to an accuracy of ± 10%. The density shall be determined in accordance with 6.3.1. 5.3 Hydrolytic stability
When necessary, the material shall meet the requirements of 5.3.1 or 5.3.2. 5.3.1 Class 1
After aging in accordance with 6.3.2.1, the change in compressive strength shall not exceed 10% of the pre-aging strength. 5.3.2 Class 2 and Class 3
After aging treatment according to 6.3.2.2 and tested according to 6.3.2.2, the stress required for compression deformation of 20% to 40% shall not exceed 10% of the stress before aging.
5.4 Water absorption (Class 1)
GB/T 157181995
When measured according to 6.3.3, the maximum weight after water absorption shall not exceed 170%. 5.5 Creep (Class 2 and 3)
When tested according to 6.3.4, the maximum deformation of the material under continuous load shall be less than 15% 5.6 Permanent deformation (Class 2 and 3)
The permanent deformation shall not exceed 20% of the original thickness. 5.7 Flexibility (Class 2, 3)
When tested according to 6.3.6, there should be no cracks, tears or falling off. It is applicable to materials with a density of not more than 0.64kg/tn. 5.8 Retention time
The manufacturer shall submit the following certificate: The composition still meets the requirements of this specification from the time of delivery to the original packaging after being placed in storage (10~32C) for one year.
5.9 Quality requirements for test samples
The test samples shall meet the following requirements:
a. The sample pores shall be uniform and without consolidation lines; b. The maximum diameter of the cavitation holes is 1.3cm, and the density of the cavitation holes with a diameter of 1.3cm shall not exceed 1/100cm (10cm×10cm). 5.10 Low temperature dimensional stability (Class 1)
When tested according to 6.3.14, the average linear change shall not exceed 5%. 5.11 Volume change
The volume change of the foam after aging treatment shall not exceed 7% of the original volume before aging treatment (see 6.3.7). 5.12 Relative flammability
The relative flammability of flame retardant foam shall be carried out in accordance with 6.3.8. The flame front of each test sample shall not reach or exceed the 12.5 cm mark specified in the test. Beyond the 12.5 cm mark, the sample shall not have visible signs of burning or melting. 5.13 Compressive strength (Class 1)
The minimum compressive strength shall be as follows:
Type 1 -136 kPa (parallel to the rising direction), -81.6 kPa (perpendicular to the rising direction); Type 2 - -204 kPa (horizontal to the rising direction); 102 kPa (perpendicular to the rising direction).
When no type is specified, the requirements of Type 1 shall apply. 5.14 Dynamic cushioning characteristics (Class 2, 3)
When tested in accordance with 6.3.10, the maximum acceleration-static pressure curves of Class 2 A, B and Class 3 shall be within the specified error range (see Appendix A Reference) Figures A1, A2, A3].
5.15 Maximum reaction temperature
The maximum reaction temperature (see 6.3.12) shall not be higher than the values listed in Table 1. 5.16 Tensile strength (Class 1)
Unless otherwise specified, the test shall be carried out in accordance with the provisions of 6.3.13. The tensile strength shall be a minimum of 240 kPa in the direction parallel to the sample and a minimum of 200 kPa in the direction perpendicular to the sample.
5.17 Oil resistance (Class 1)
Unless otherwise specified, the test shall be carried out in accordance with the provisions of 6.3.15. There shall be no softening of the sample after immersion in oil. 6 Test method
6.1 Preparation of test samples
GB/T15718-1995
Mix the raw materials according to the requirements of 5.1.1 and inject them into a container of 30cm×30cm×30cm or larger. They should be able to rise freely. Sampling can be done after the foam solidifies for 24 hours. The sample should be sampled from 4.0ctm away from the hexahedron of the foam material, and the selected sample should have no consolidation line or cavitation holes with a diameter of no less than 1.3cm, and the density of cavitation holes with a diameter of 1.3cm should not exceed 1/100cm2 (10cm×10cm). 6.1.1 Selection of test samples
Test samples should be randomly selected. All test samples should have no skin and be cut well to avoid curling or edge pressing. 6.1.2 Size of test samples
The test sample is a regular rectangular parallelepiped with a bottom area of at least 10cm×10cm. In general, the thickness of the test sample is not less than 2.5cm.
6.1.3 Measurement of test samples
6.1.3.1 Length and width
Measure the length and width of the test sample with a measuring tool with an accuracy of not less than 0.05mm at the two ends and the three middle positions, and calculate the average value to the nearest 0.01cm. 6.1.3.2 Thickness
Place a flat rigid plate on the upper surface of the test sample, subject the test sample to a compression load of 0.20±0.02kPa for 30s, and measure the thickness of the four corners with a measuring tool with an accuracy of not less than 0.05cm under load, and calculate the average value to the nearest 0.01cm. 6.2 Pretreatment of test samples
Before the test, select one of the conditions in GB/T4857.2 and pretreat the test sample for more than 24 hours. 6.3 Test method
6.3.1 Density
Prepare two specimens according to 6.1, determine the thickness of each specimen according to 6.1.3, and measure the weight of the specimen to an accuracy of 0.01 g. The density of the specimen shall be determined according to formula (1):
D=IxWXT
Wherein: D-density, g/cm;
m---sample weight, g;
L-sample length, cm;
W-sample width, m
T-sample thickness, cm. The density of the batch of materials shall be the average density of the individual samples. 6.3.2 Hydrolytic stability
6.3.2.1 Class 1
The test samples shall be placed at 70±1°C and (95±5)% relative humidity for 14 days, then placed in an environment of 49±1°C for 24 hours, and then placed at room temperature for at least 30 minutes before the compression test. 6.3.2.2 Class 2 and Class 3
Three test samples shall be prepared according to 6.1 and placed on a press. The test samples shall be pre-compressed before the test, that is, pressurized between two parallel rigid plates. For Class 2 and 3 foam materials, they should be compressed 10 times at a compression speed of 25-50 mm/min, with each compression amount being 40% of the original thickness. After 3 minutes of recovery, a preload of 0.200.02 kPa should be added, and the thickness of the sample should be measured to an accuracy of 0.01 cm. The pre-compressed thickness should be used as the zero point, and the sample should be loaded at a speed of 5.0 cm/min, and the load at the 20% and 40% strain of the thickness before the start of loading should be recorded. 6.3.3 Water absorption (Class 1)
The test sample is a piece and is checked for compliance with the requirements of 5.4. The water absorption is determined by the following immersion force method. The sample is placed in a desiccator for 24 hours and weighed on a balance. The result is used as the weight before immersion G1. Then, the sample is immersed in a glass container filled with distilled water to a depth of 50 mm. After the sample is immersed in water for a specified time, it is taken out of the water and placed on a 15 cm × 15 cm sieve. After dripping water for 1 minute, the wet sample is weighed and the result is taken as the weight after water absorption G2. The water absorption rate of the sample is calculated using formula (2): 713
Where: W. — water absorption rate of the sample, %;
weight of the sample before immersion in water, g;
C2 — weight of the sample after immersion in water, g.
Test conditions shall meet the following requirements:
Use a balance with an accuracy of 0.01g;
Test sample weighed accurately to 0.01g;
GB/T 15718--1995
The volume of the test sample shall be 10cm×10cm×(2.5±0.1)cm; The test sample shall be immersed in a distilled water container maintained at 23-27°C; d.
The immersion time is 96±1h.
6.3.4 Creep (Types 2 and 3)
The creep test shall be carried out in accordance with GB/T14745.
6.3.5 Permanent deformation (Type 2, 3)
The samples in this test are the samples tested according to 6.3.4. After unloading the load for 4 hours, measure the sample thickness according to 5.3.4 and calculate the permanent deformation by formula (3):
Where: E—permanent deformation,%;
T—initial thickness (without load), cm;
Tr—thickness measured 4 hours after unloading, cm. 6.3.6 Flexibility (Type 2, 3)
(3)
The size of each sample should be 15cm×15cm×1.3cm, the thickness error should be 0.1cm, and the thickness should be cut parallel to the rising direction of the foam. The sample should be bent 180° along a round bar with a diameter of 1.3cm as quickly as possible. The test should be carried out at room temperature and -40°C respectively. When testing at low temperature, the sample should be conditioned at -40℃ for at least 4h, and then measured. 6.3.7 Volume change
Measure three test samples according to 6.1.3, calculate and record the volume, and then condition according to the temperature and humidity specified in 6.3.2. Calculate its volume and express it as a percentage of the initial volume. Test whether it meets the requirements of 5.11. 6.3.8 Relative flammability
The test method for the flammability of foam materials is carried out in accordance with GB8332. The size of the test sample is 15cm×15cm×0.2cm6.3.9 Compression strength (Class 1)
Carry out compression test in accordance with GB8168, and check whether it meets the requirements of 5.3.1 and 5.13. 6.3.10 Dynamic cushioning characteristics (Classes 2 and 3) Test in accordance with GB8167, and check whether it meets the requirements of 5.14. 6.3.11 Viscosity of raw materials
The viscosity of raw materials shall be determined according to the method of GB265 and checked to see if it meets the requirements of Table 1. 6.3.12 Maximum reaction temperature
The mixed chemical substances expand in a 30cm×30cm×30cm container and completely fill the entire container. A temperature sensor, thermocouple or thermometer is placed in the center of the container to monitor for 2 hours and record the maximum temperature. 6.3.13 Tensile strength (Class 1)
When the tensile strength is specified, three samples shall be taken in parallel and perpendicular to the direction of foam rise and tested according to GB9641. And check whether it meets the requirements of 5.16.
6.3.14 Low temperature dimensional stability (Class 1)
GB/T15718-1995
Take five samples in the direction of foam rise and test them at a test temperature of 40±3℃ according to Chapter 12 of SG233. 6.3.15 Oil resistance
6.3.15.1 Sample preparation
A foam body with a size of 30cm×30cm×30cm should be cast. The foam body should be cut off at least 5cm from all sides and at least 7.5cm from the top and bottom to make it neat. Use a round die with an inner diameter of 2.7cm to cut out 5 samples with a thickness of 2.5cm. The test samples should be conditioned at 23±1℃ and relative humidity of (50±5)% for at least 24h. 6.3.15.2 Test extent
Immerse the sample in oil with an aniline point of 93±3℃, a kinematic viscosity of 19.2～21.5mm2/s and a flash point of 240℃. The environmental conditions in the test room are 23±1℃, 50±5%. Take out the sample after 70h and compare it with the one without oil immersion to see if there is any sign of softening or corrosion. 7
Inspection rules
Unless otherwise specified in the contract or order, the supplier shall be responsible for completing all inspections specified in this standard. Unless otherwise specified in the contract or order, as long as the relevant competent authorities approve it, the supplier may use its own equipment or any other equipment that can complete the inspection requirements of this standard. The ordering party has the right to inspect any inspection item described in this standard to determine whether the product meets the requirements of this standard. 7.1 Inspection classification
The inspections specified in this standard are divided into:
a. Finalization inspection;
b. Delivery inspection.
7.2 Finalization inspection
Finalization inspection shall be carried out before the new product is put into production in the laboratory approved by the contractor or the place designated by the relevant competent authorities. Finalization inspection shall consist of the inspection items in Table 2. If any of the items in Table 2 is unqualified, the product shall be judged to have failed the finalization inspection. Table 2 Finalization test items
Density (when required by the contract)
Hydrolytic stability
Water absorption
Permanent deformation
Softness
Standing time
Sample quality requirements
Low temperature dimensional stability
Volume change
Flammability
Compressive strength
Dynamic cushioning
Maximum reaction temperature
Tensile strength
7.3 Acceptance inspection
7.3.1 Inspection items
The acceptance inspection shall consist of the tests in Table 3.
Class 2, Class 3
5.15 and Table 1
5.15 and Table 1
Test Method No.
7.3.2 Sampling
7.3.2.1 Batch
Density (when required)
Dynamic Buffer
CB/T15718-1995
Table 3 Acceptance Test Requirements
Requirement No.
Test Method No.
When sampling, a batch should consist of two parts, A material and B material, formed once with the same volume. And the A and B components formed twice should be delivered and accepted at the same time.
7.3.2.2 Sampling Plan
The sampling plan should be in accordance with the GB2828 one-time sampling plan, the general inspection level is 1, and the qualified quality level AQI. is 2.5%. 8 Marking, packaging, transportation, storage
8.1 Marking
8.1.1 The transport packaging container should have a shipping and receiving mark, which should comply with the provisions of GB6388. 8.1.2 The transport packaging box should have a storage and transportation pictorial mark, which should comply with the provisions of GB191. 8.1.3 Each container should be labeled with the following information, and the label should be waterproof: a. Gross weight and net weight (kg); Manufacturer’s name and address; Model: Handling measures: Each polymeric isocyanate should have the following label: "Caution: If inhaled, it may cause respiratory allergies and skin inflammation. Appropriate protection should be used to avoid contact with eyes, skin and clothing; avoid inhalation of gas"; e. Storage time and expiration date (year, month, day); Manufacturing date (year, month, day); Mixing ratio by weight or volume; Manufacturing quantity or batch number; Operating and storage temperature range; Composition specifications ("A" is polymeric isocyanate, "B" is polyurethane resin). All containers shall be color coded on the top and sides as follows: 8. 1.4
“A\ component: red or yellow;
“B\ component: blue.
8.2 Packaging
8.2.1 Packing
The packing shall be Class A or specified packing grade. For packing grade, see SJ/Z3216. The A and B component raw materials of Class A packing shall be separately packed into metal containers that comply with relevant regulations, and the containers shall be able to withstand a pressure of 20.7 kPa.
8.2.2 Unitized load
When specified, the container shall be padded with wood.
8.3 Transportation
Packages may be transported by vehicles, trains and other means of transport. During transportation, they shall be covered with cloth. 8.4 Storage
The packaged products shall be stored in a warehouse with an ambient temperature of 10～～38℃ and a storage period of 1 year. 716
GB/T 15718
Appendix A
Category 2 and 3 foam-in-place packaging materials cushioning curves (reference)
Class 2 Grade A
Peak G static stress curve
Drop height: 610mm
Specimen size: 200mm×200mm×76mm
Static stress W/A (g/cm3)
Figure A12 Class A polyurethane foam characteristic curve Class 2 Grade B
Peak value G-static stress curve
Drop height: 610mm
Specimen size: 200mm×200 mm×76mm3.8
Static stress W/A (g/cm2)
2 Class B polyurethane foam characteristic curve
Additional instructions:
GB/T15718-1995
Peak G-static stress curve
Drop height: 610mm
Specimen size: 200mm×200mm×76mm3.8
Static stress w/A (g/cm2)
Figure A33 Class polyurethane foam characteristic curve
This standard is proposed by the Ministry of Electronics Industry of the People's Republic of China. This standard is under the jurisdiction of the Standardization Institute of the Ministry of Electronics Industry. 25.0
This standard was drafted by the Standardization Institute of the Ministry of Electronics Industry and Yantai Development Zone Huajing Packaging Technology Company. The main drafters of this standard are: Dai Hong, Luo Xuan'an, Mu Huaiping, Liu Hong, and Zhang Zhiliang. 7484 Storage
The packaging is required to be stored in a warehouse with an ambient temperature of 10～～38℃ and a storage time of 1 year. 716
GB/T 15718
Appendix A
Category 2 and 3 foam-in-place packaging material cushioning curves (reference)
Category 2 Grade A
Peak G static stress curve
Drop height: 610mm
Specimen size: 200mm×200mm×76mm
Static stress W/A (g/cm3)
Figure A12 Class A polyurethane foam characteristic curve Class 2 Grade B
Peak value G-static stress curve
Drop height: 610mm
Specimen size: 200mm×200 mm×76mm3.8
Static stress W/A (g/cm2)
2 Class B polyurethane foam characteristic curve
Additional instructions:
GB/T15718-1995
Peak G-static stress curve
Drop height: 610mm
Specimen size: 200mm×200mm×76mm3.8
Static stress w/A (g/cm2)
Figure A33 Class polyurethane foam characteristic curve
This standard is proposed by the Ministry of Electronics Industry of the People's Republic of China. This standard is under the jurisdiction of the Standardization Institute of the Ministry of Electronics Industry. 25.0
This standard was drafted by the Standardization Institute of the Ministry of Electronics Industry and Yantai Development Zone Huajing Packaging Technology Company. The main drafters of this standard are: Dai Hong, Luo Xuan'an, Mu Huaiping, Liu Hong, and Zhang Zhiliang. 7484 Storage
The packaging is required to be stored in a warehouse with an ambient temperature of 10～～38℃ and a storage time of 1 year. 716
GB/T 15718
Appendix A
Category 2 and 3 foam-in-place packaging material cushioning curves (reference)
Category 2 Grade A
Peak G static stress curve
Drop height: 610mm
Specimen size: 200mm×200mm×76mmwwW.bzxz.Net
Static stress W/A (g/cm3)
Figure A12 Class A polyurethane foam characteristic curve Class 2 Grade B
Peak value G-static stress curve
Drop height: 610mm
Specimen size: 200mm×200 mm×76mm3.8
Static stress W/A (g/cm2)
2 Class B polyurethane foam characteristic curve
Additional instructions:
GB/T15718-1995
Peak G-static stress curve
Drop height: 610mm
Specimen size: 200mm×200mm×76mm3.8
Static stress w/A (g/cm2)
Figure A33 Class polyurethane foam characteristic curve
This standard is proposed by the Ministry of Electronics Industry of the People's Republic of China. This standard is under the jurisdiction of the Standardization Institute of the Ministry of Electronics Industry. 25.0
This standard was drafted by the Standardization Institute of the Ministry of Electronics Industry and Yantai Development Zone Huajing Packaging Technology Company. The main drafters of this standard are: Dai Hong, Luo Xuan'an, Mu Huaiping, Liu Hong, and Zhang Zhiliang. 748
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