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電阻率18.25MΩ·cm被認(rèn)為是超純水的最佳理論水質(zhì)指標(biāo)。隨著微電子產(chǎn)業(yè)的發(fā)展,僅用這一項(xiàng)指標(biāo)來(lái)衡量超純水是遠(yuǎn)遠(yuǎn)不夠的。超純水中的微粒、TOC、溶解氧、二氧化硅、細(xì)菌及其它PPT級(jí)的金屬離子,成為影響微電子產(chǎn)業(yè)及其他產(chǎn)業(yè)產(chǎn)品質(zhì)量及產(chǎn)品良率的主要因素。
半導(dǎo)體行業(yè)典型的工藝流程
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美國(guó)ASTM電子半導(dǎo)體行業(yè)超純水的水質(zhì)標(biāo)準(zhǔn)
| Parameter | Type E-1 | Type E-1.1 | Type E-1.2 | 
| Linewidth(microns) | 1.0-0.5 | 0.5-0.25 | 0.25-0.18 | 
| Resistivity,25℃ | 18.2 | 18.2 | 18.2 | 
| *Temperature | 
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 | 
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| *Pressure | 
 | 
 | 
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| Endotoxin unit(EU/ml) | 0.03 | 0.03 | 0.03 | 
| TOC(μg/L) | 5 | 2 | 1 | 
| Dissolved oxygen(μg/L) | 1 | 1 | 1 | 
| Residue after evaporation(μg/L) | 1 | 0.5 | 0.1 | 
| SEM particles/L(micron range) | 
 | 
 | 
 | 
| 0.1-0.2 | 1000 | 1000 | 200 | 
| 0.2-0.5 | 500 | 500 | 100 | 
| 0.5-0.1 | 50 | 50 | 1 | 
| 10 | - | 
 | - | 
| On-line particles/L(micron range) | 
 | 
 | 
 | 
| Particles(>0.05micron) | 
 | 
 | 
 | 
| 0.05-0.1 | 500 | 500 | 100 | 
| 0.1-0.2 | 300 | 300 | 50 | 
| 0.2-0.3 | 50 | 50 | 20 | 
| 0.3-0.5 | 20 | 20 | 10 | 
| >0.5 | 4 | 4 | 1 | 
| Bacteria/100 mL | 
 | 
 | 
 | 
| 100ml Sample | 1 | 1 | 1 | 
| 1L Sample | 1 | 1 | 0.1 | 
| Silica | 
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| 
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| Silica-total(μg/L) | 3 | 0.5 | 0.5 | 
| Silica-dissolved(μg/L) | 1 | 0.1 | 0.05 | 
| lons and metals(μg/L) | 
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 | 
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| Ammonium | 0.1 | 0.10 | 0.05 | 
| Bromide | 0.1 | 0.05 | 0.02 | 
| Chloride | 0.1 | 0.05 | 0.02 | 
| Fluoride | 0.1 | 0.05 | 0.03 | 
| Nitrate | 0.1 | 0.05 | 0.02 | 
| Nitrite | 0.1 | 0.05 | 0.02 | 
| Phosphate | 0.1 | 0.05 | 0.02 | 
| Sulfate | 0.1 | 0.05 | 0.02 | 
| Aluminum | 0.05 | 0.02 | 0.005 | 
| Barium | 0.05 | 0.02 | 0.001 | 
| Boron | 0.05 | 0.02 | 0.005 | 
| Calcium | 0.05 | 0.02 | 0.002 | 
| Chromium | 0.05 | 0.02 | 0.002 | 
| Copper | 0.05 | 0.02 | 0.002 | 
| Iron | 0.05 | 0.02 | 0.002 | 
| Lead | 0.05 | 0.02 | 0.005 | 
| Lithium | 0.05 | 0.02 | 0.003 | 
| Magnesium | 0.05 | 0.02 | 0.002 | 
| Manganese | 0.05 | 0.02 | 0.002 | 
| Nicke | 0.05 | 0.02 | 0.002 | 
| Potassium | 0.05 | 0.02 | 0.005 | 
| Sodium | 0.05 | 0.02 | 0.005 | 
| Strontium | 0.05 | 0.02 | 0.001 | 
| Zinc | 0.05 | 0.02 | 0.002 | 
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| *Temperature and pressure values to be determined | |||