Some standard content:
Chemical Industry Standard of the People's Republic of China
HG/T2003-91
Electronic Component Paint
Published on June 27, 1991
Ministry of Chemical Industry of the People's Republic of China
Implemented on February 1, 1992
Chemical Industry Standard of the People's Republic of China
Electronic Component Paint
1 Subject Content and Scope of Application
HG/T2003-91
This standard specifies the technical requirements, test methods, inspection rules and marking, packaging, storage and transportation requirements for electronic component paints for resistors, capacitors and potentiometers.
This standard applies to electronic component paints for resistors, capacitors, potentiometers, etc. with alkyd, phenolic, epoxy, silicone and other resins as paint bases. 2 Reference standards
GB1721
GB1727
GB1728
GB1729
GB1735
GB1736
GB1738
GB1740
GB1981
GB3186
GB6742
GB6751
Determination of appearance and transparency of varnish, clear oil and thinnerGeneral preparation method of paint film
Determination of drying time of paint film and putty film
Determination of color and appearance of paint film
Determination of heat resistance of paint film
Preparation method of insulating paint film
Insulation Determination of water absorption of paint film
Determination of moisture and heat resistance of paint film
Test method for solvent-free paint for electrical insulation
Sampling of paint products
Bending test of paint film (cylindrical shaft)
Determination of volatile and non-volatile matters in paints and varnishes GB6753.1
GB9286
Determination of grinding fineness of paint
Determination of outflow time of paint ISO flow cup method Cross-cut test of paint and varnish film
Paint product packaging markWww.bzxZ.net
GB9750
3 Product categories and models
The electronic component paint is divided into resistor paint, capacitor paint and potentiometer paint. The resistor paint can be divided into assembly line type and non-assembly line type. 4 Technical requirements
The product shall meet the technical requirements listed in Table 1: Approved by the Ministry of Chemical Industry of the People's Republic of China on June 27, 1991 and implemented on February 1, 1992
Appearance and transparency of original paint, grade
Color and appearance of paint film
Viscosity (No. 6 cup), s
(No. 4 cup), s
Fineness.um
Flexibility, mm
Adhesion, grade
Drying time:
120±2
140± 2℃,h
150±2
160±2
180±2
Non-volatile matter, %
Water absorption, %
Moisture and heat resistance:
Alkyd, phenolic (48h), grade
Epoxy (240h), grade
Silicone (360h), grade
Temperature change resistance:
3 cycles
Volume resistivity:
Normal state, a·cm
Water immersion,·cm|| tt||not greater than
not less than
not less than
not greater than
not greater than
not greater than
not greater than
not greater than
not greater than
not greater than
not greater than
not greater than
not less than
not greater than
not greater than
not greater than
not less than
HG/T2003—91
Resistance Capacitor paint
Capacitor paint
Conform to standard sample and color difference range, flat and smooth 30
Assembly line type
Non-assembly line type
The paint film does not crack, bubble or fall off
1X1013
1×1011
Potentiometer paint
No mechanical impurities
Note: If the four test conditions of the product's drying time, moisture and heat resistance, temperature change resistance and volume resistivity are otherwise specified (or required), the test can be carried out in accordance with the provisions (or requirements).
5 Test method
5.1 Appearance and transparency of the original paint
Perform according to GB1721.
5.2 Color and appearance of the paint film
Perform according to GB1729.
5.3 Viscosity
Test according to GB6753.4, using No. 4 or No. 6 cup. 5.4 Fineness
Test according to GB6753.1.
5.5 Flexibility
Test according to GB6742.
5.6 Adhesion
Test according to GB9286.
5.7 Drying time
HG/T2003—91
Test according to Method A of the actual drying time in GB1728. 5.8 Non-volatile matter
Test according to GB6751.
5.9 Water absorption
Test according to GB1738.
5.10 Resistance to moisture and heat
5.10.1 Test conditions: temperature 40±2℃, relative humidity (96±2)%. 5.10.2 The substrate is a thin steel plate. The test time depends on the product regulations. 5.10.3 Test in accordance with GB1740. 5.11 Resistance to temperature change
5.11.1 Test conditions: 23±1℃, 15min; 55±2℃, 30min;
23±1℃, 15min;
85±2℃, 30min.
5.11.2 The substrate is a tinplate.
Put the prepared test plate at 23±1°C for 15 minutes, put it in a freezer at -55±2°C for 30 minutes, take it out and put it at 23±1°C for 15 minutes, and then put it in an oven at 85±2°C for 30 minutes. The temperature and time of the above four stages constitute a test cycle.
5.11.4 Test and evaluate according to the provisions of GB1735. 5.12 Volume resistivity
5.12.1 Prepare the paint film according to the provisions of GB1736. 5.12.2 Test according to the provisions of GB1981. 6 Inspection rules
6.1 All the technical requirements listed in this standard are type inspection items. Except for the three items of moisture and heat resistance, temperature change resistance and volume resistivity (which shall be inspected at least once a year), the remaining items of various paints are factory inspection items. 6.2 The product shall be inspected by the inspection department of the manufacturer in accordance with the provisions of this standard. The manufacturer shall ensure that all products leaving the factory meet the technical requirements of this standard. The product shall have a certificate of conformity and, if necessary, instructions for use and precautions. 6.3 The receiving department has the right to inspect the product in accordance with the provisions of this standard. If it is found that the quality does not meet the technical requirements of this standard, the supplier and the buyer shall jointly resample and re-inspect in accordance with GB3186. If it still does not meet the technical requirements of this standard, the product shall be unqualified and the receiving department shall have the right to return the product.
6.4 The product shall be sampled in accordance with the provisions of GB3186. The sample shall be divided into two parts, one for sealed storage for future reference and the other for inspection. 6.5 The supplier and the buyer shall check and verify the product packaging, quantity and marking. If the packaging is damaged or leaking, the quantity is inconsistent, or the marking does not meet the requirements, the relevant departments shall be notified in time for handling. 6.6 When there is a dispute between the supplier and the buyer over product quality, the product quality supervision and inspection agency shall perform arbitration inspection. 7 Marking
Perform in accordance with the provisions of GB9750.
8 Packaging, storage and transportation
HG/T2003—91
8.1 The product should be stored in a clean, dry and sealed container with the filling amount not exceeding 95% of the volume. When storing, the product should be kept ventilated, dry, and protected from direct sunlight. It should be isolated from fire and away from heat sources. When the temperature is too high in summer, efforts should be made to cool it down. 8.2 When transporting the product, it should be protected from rain and sunlight and should comply with relevant regulations. 8.3 Under the storage conditions in accordance with Articles 8.1 and 8.2, the effective storage period of the product is calculated from the date of production, depending on the product. If the storage period is exceeded, it can be inspected according to the items specified in this standard and can still be used if the results meet the requirements. 9 Safety, hygiene and environmental protection regulations
9.1 This product contains organic solvents such as benzene, alcohols, ketones, etc., which are flammable, explosive and toxic substances. 9.2
Safety measures such as ventilation, fire prevention, anti-static and anti-poisoning should be adopted in the construction site, and the safe operation procedures and relevant regulations of coating operations should be followed.
The maximum allowable concentration of toxic substances commonly used in construction in the air and the safety parameters of explosion and fire prevention are listed in Table 2: 9.3
Xylene
Cyclohexanone
Maximum allowable concentration
Stability
Flammable and explosive
Flammable and explosive
Explosion limit
Autoignition point
HG/T2003—91
Appendix A
Construction reference
(reference)
Various component paints must be used within the specified service life of the product. A1
Resistor paint and capacitor paint must be adjusted to a paint liquid viscosity suitable for coating components of different specifications, or the viscosity can be adjusted according to the provisions of the product manual.
After the component is dipped in paint, the excess paint droplets on the surface should be removed, and it can be placed in the drying room only after the surface is dry. A3
Potentiometer paint is added with carbon black by the user, or acetylene black is ground to adjust the required resistance value. The diluent is xylene, butanol, cyclohexanone, or a mixed solvent of xylene: butanol = 3:1 (weight ratio). Additional remarks:
This standard is proposed by the Science and Technology Department of the Ministry of Chemical Industry of the People's Republic of China. This standard is under the jurisdiction of the National Technical Committee for Standardization of Paints and Pigments. This standard was drafted by Shanghai Kailin Paint Factory. The main drafter of this standard is Xu Xi.
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