1.industrial grade
2. toothpaste grade
ltem |
toothpaste grade(Y) |
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(一)Level |
(二)Level |
(三)Level |
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Appearance |
White or yellowish powder or needle, without caking |
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Active matter (%)≥ |
95.0 |
93.0 |
93.0 |
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Petroleum ether soluble substances (%)≤ |
1.2 |
1.2 |
1.2 |
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Inorganic salts(%)≤ |
Na2SO4 |
2.5 |
3.2 |
4.0 |
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NaCl |
0.15 |
0.15 |
0.15 |
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Water (%)≤ |
2.0 |
2.0 |
3.0 |
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pH Value (1% aq. solution) |
8-9.3 |
8-9.3 |
8-10 |
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Whiteness (WG)≥ |
90 |
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Foam volume/mm,≥ |
180 |
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Heavy metal(Pb)/(mg/Kg),≤ |
15 |
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Arsenic content(As)/(mg/Kg),≤ |
3 |
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Aerobic bacterial count/(CFU/g),≤ |
100 |
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Total number of molds and yeasts/(CFU/g),≤ |
100 |
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Fecal coliform/g |
not detectable |
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Pseudomonas aeruginosa/g |
not detectable |
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Staphylococcus aureus/g |
not detectable |
3.Latex grade standard rubber
Item |
Latex level(powder、needle、liquid) |
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Polymer grade |
Seed stage |
Liquid K12 |
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Appearance |
White or yellowish powder or needle, without caking |
Yellowish Transparent Liquid |
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Active matter (%)≥ |
94.0 |
92 |
28.5-30.5 |
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Petroleum ether soluble substances (%)≤ |
0.8-1.0 |
1.5-2.0 |
1.5 |
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Inorganic salts(%≤ |
Na2SO4 |
3.0 |
3.0 |
1.5 |
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NaCl |
0.15 |
0.15 |
0.05 |
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Water (%)≤ |
3.5 |
3.5 |
- |
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PH Value (1% aq. solution) |
8-10 |
7.5-9.5 |
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Whiteness (WG),≥ |
90 |
- |
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Colour Klett(30% active matter),≤ |
- |
60 |
3. NCCLS
Item |
Reagent grade |
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99% |
97% |
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Appearance |
White sheet crystal |
WhitePowder |
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Solubility (1%, alcohol) |
completely dissolved |
- |
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Solubility (10%, aqueous solution) |
completely dissolved |
- |
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Chroma APHA(20%, deionized water),≤ |
15 |
- |
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Active matter (%),≥ |
99(In dry basis) |
97 |
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Petroleum ether soluble substances (%),≤ |
0.2 |
1.0 |
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Na2SO4(%),≤ |
0.1 |
1.5 |
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NaCl(%),≤ |
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Water (%),≤ |
1.0 |
2.0 |
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PH Value (1% aq. solution) |
6.0-8.0 |
6.0-11 |
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Phosphate,≤ |
1ppm |
- |
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Plumbum(Pb),≤ |
2ppm |
- |
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Iron(Fe),≤ |
1ppm |
- |
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Nitrogen,≤ |
5ppm |
- |
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Arsenic(As),≤ |
0.1ppm |
- |
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Fraction content(%),≥ |
99.0 |
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Absorption value (3%, deionized water) |
230nm,≤ |
0.4 |
- |
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260nm,≤ |
0.1 |
- |
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280nm,≤ |
0.1 |
- |
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410nm,≤ |
0.01 |
- |
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