JC 427-1991 in English
VALIDSynthetic mica powder for welding rods
- Issued on:1991-03-22
- Implemented on:1991-12-01
- File Format:PDF
- Delivery:Via email within 1~3 business days
$388.00
| Standard No: | JC 427-1991 |
| Document status: | VALID |
| Title in English: | Synthetic mica powder for welding rods |
| Title in Chinese: | 电焊条用合成云母粉 |
| Language: | English |
| File Format: | Electronic (PDF) |
| Delivery: | Via email within 1~3 business days |
| Issued on: | 1991-03-22 |
| Implemented on: | 1991-12-01 |
| Professional Classification: | JC-Building Material |
| Related Keywords: | synthetic mica powder
mesh specification rods introduction analysis mesh volumetric method al₂o₃ determination |
Introduction
Analysis of the core content of the standard
| Technical dimension | 0.800mm(20 mesh) | 0.520mm(30 mesh) | 0.391mm(40 mesh) |
|---|---|---|---|
| Allowance of particle size | +1.188/-0.187mm | +0.800/-0.150mm | +0.520/-0.123mm |
| Sieve residue control | ＜30%(14 mesh) | ＜20%(20 mesh) | ＜30%(30 mesh) |
Key technical requirements
Component control: SiO₂≥38%, MgO 24-29%, Fe₂O₃+Al₂O₃≤0.03%, special requirements can be negotiated
Physical indicators: The appearance must be silver-white flaky crystals, moisture ≤0.5%, loose density <0.6g/cm³
Test method essence
Typical test process
- Sample preparation: Grind in agate mortar to 120 mesh, dry at 105-110℃ for 2h
- SiO₂ determination: GB 205 potassium fluorosilicate volumetric method
- Al₂O₃ determination: EDTA back titration method, pH 5.7-6.0 buffer system
- F element detection: ion selective electrode method, 700℃ melting pretreatment
Standard implementation suggestions
1. When purchasing, suppliers should be required to provide a complete composition analysis sheet
2. Different types of welding rods should choose the corresponding particle size:
- Low hydrogen steel welding rod: 40 mesh specification is preferred
- High strength steel welding rod: 30 mesh specification is better
3. Storage should be kept in a dry environment, and the recommended relative humidity is ≤60%
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