JB/T 4254-2016 in English
VALIDliquid sealant
- Issued on:2016-04-05
- Implemented on:2016-09-01
- File Format:PDF
- Delivery:Via email within 1~3 business days
$252.00
| Standard No: | JB/T 4254-2016 |
| Document status: | VALID |
| Title in English: | liquid sealant |
| Title in Chinese: | 液态密封胶 |
| Language: | English |
| File Format: | Electronic (PDF) |
| Delivery: | Via email within 1~3 business days |
| Issued on: | 2016-04-05 |
| Implemented on: | 2016-09-01 |
| ICS Classification: | 25.080.01-Machine tools in general |
| Chinese Classification: | J50-Machine tool in general |
| Professional Classification: | JB-Machinery |
| Related Keywords: | key test methods pressure resistance test
glue semi-drying/drying glue test standards viscosity clause heat exchange pressure resistance ≥4.90 clause sealant introduction background steel flange test piece |
Introduction
Background of Standard Revision and Technological Evolution
The 2016 version of the standard replaces the 1999 version. The main technical changes include: media specification update (No. 32 mechanical oil is changed to No. 32 hydraulic oil, and No. 90 unleaded gasoline is adjusted to No. 93 motor gasoline), test method standardization (viscosity/density determination refers to the latest GB/T standard), and structural adjustment (new chapters on term definitions and inspection rules are added).
Analysis of core technical requirements
| Performance indicators | Non-drying glue | Semi-drying/drying glue | Test standards |
|---|---|---|---|
| Viscosity (mPa·s) | ≥5000 | ≥1000 | GB/T 2794-2013 |
| 150℃ pressure resistance (MPa) | 3.92 | 6.86 | 5.4 Clause |
| Heat exchange pressure resistance | ≥4.90 | Clause 5.5 | |
Detailed explanation of key test methods
Pressure resistance test (Clause 5.4)
Use 45 steel flange test piece, 6 M12 screws tightened with (27.4±1.0)N·m torque:
- Stepped pressurization: 0.3MPa/15min per level
- Temperature conditions: room temperature/80℃/150℃ three levels
- Judgment standard: 2 test deviations ≤0.5MPa
Corrosion test (Clause 5.7)
The specimen is coated on HT200 cast iron, 45 steel, and H62 brass test pieces:
- Wet and hot conditions: 49℃±1℃/RH≥93%
- Test cycle: 96 hours of continuous exposure
- Qualified judgment: no rust or gloss loss on the surface
Implementation suggestions and precautions
Selection guide
Select the glue type according to the working conditions: Non-drying glue is suitable for areas that are frequently disassembled, and drying glue is more suitable for high temperature and high pressure environments.
Key points of process control
- Coating thickness: 0.1-0.15mm on one side
- Curing time: ≥3min at room temperature (Clause 5.4.2)
- Prohibited scenarios: Metal combinations that fail the corrosion test
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