Table 3
Main similarities and differences between the three standards ASTM 2765-16, IEC FDIS 62788 and GB/T29848-2018.
| Equipment | |
| ASTM 2765-16 | Round-bottom flask, reflux condenser |
| GB/T29848-2018 | Reaction flask, reflux condenser |
| IEC FDIS 62788 | Soxhlet apparatus or similar |
| Solvent | |
| ASTM 2765-16 | Xylene or decahydronaphtalene |
| GB/T29848-2018 | Xylene |
| IEC FDIS 62788 | Xylene, toluene or tetrahydrofuran (THF) |
| Particle size | |
| ASTM 2765-16 | Grinded particles which pass through 30-, but not through 60- mesh |
| GB/T29848-2018 | < (3 × 3) mm2 |
| IEC FDIS 62788 | Small pieces (size not mentioned) |
| Antioxidant | |
| ASTM 2765-16 | 1%, e.g. 2,2′-methylenebis(4-methyl-6-tert-butylphenol) |
| GB/T29848-2018 | Not specified |
| IEC FDIS 62788 | 2% wt. of the EVA, e.g. 2,2′-methylenebis(4-methyl-6-tert-butylphenol) or 2,6 di-tert-butyl-4-methylphenol (BHT) |
| Extraction duration | |
| ASTM 2765-16 | 12 h (xylene) |
| GB/T29848-2018 | 5 h |
| IEC FDIS 62788 | ≥ 8 h (for xylene), for expected GC < 70% ≥ 12 h; ≥ 15 cycles per hour for other solvents time has to be adapted. |
| Placement of sample | |
| ASTM 2765-16 | Into hot solvent |
| GB/T29848-2018 | Into cold solvent, heating up |
| IEC FDIS 62788 | Not specified |
| Replacement of sample | |
| ASTM 2765-16 | Not specified |
| GB/T29848-2018 | Not specified |
| IEC FDIS 62788 | Not specified |
| Drying | |
| ASTM 2765-16 | 150 °C, to constant weight |
| GB/T29848-2018 | 140 °C, to constant weight |
| IEC FDIS 62788 | 115 °C, to constant weight, ≥4 h |
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