Rev. LT 7 Feb1999
3.2 Laboratory scale
0 % > 250 µm
0.1% > 125 µm, (< 250 µm)
2.1% > 63 µm, (< 125 µm)
98.2 % < 63 µm
The following sizes belongs to an ISO main serie:
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International Starch Institute
Science Park Aarhus, Denmark
ISI 32-1e Determination of Starch Size Distribution by Screening
| 1. Scope | The method is applicable to starch
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LT 1970 Rev. LT 7 Feb1999 |
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| 2. Principle | Starch size distribution is determined by screening
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| 3. Apparatus | 3.1 Screening set of lit, one or more screens and bottom 3.2 Laboratory scale |
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| 4. Procedure | Weigh TARA of each screen and bottom | ||
| Weigh 100 g starch sample and transfer to top screen. | |||
| Shake stack of screens until fines through top screen is negligible. | |||
| Remove top screen and shake until fines through next screen are negligible and so on until all screens are removed. | |||
| Weigh TOTAL of each screen and bottom
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| 5. Calculation | NETTO = TOTAL - TARA of each screen and bottom | ||
| GRAND NETTO = Sum of individual NETTO | |||
| Report with one decimal each starch fraction as percent of GRAND TOTAL and characterised by the trapping mesh width (opening) in micrometer. | |||
| Example: 0 % > 250 µm 0.1% > 125 µm, (< 250 µm) 2.1% > 63 µm, (< 125 µm) 98.2 % < 63 µm
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Mesh width in parenthesis may be omitted if it is obvious that fractions are not accumulated | ||
| 6. Notes | Preferably use a 200 mm dim. vibrator sieve shaker and shake
for 15 min. The following sizes belongs to an ISO main serie: |
Screen Conversion Table | |
| DIN 4188 | equivalent ASTM | ||
| 0.063 mm | 230 mesh | ||
| 0.071 mm | 200 mesh | ||
| 0.125 mm | 120 mesh | ||
| 0.180 mm | 80 mesh | ||
| 0.250 mm | 60 mesh | ||
| 0.355 mm | 45 mesh | ||
| 7. Image |
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Sieve shaker | |
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Keywords: laboratory method determination screening granule size screen sieve starch