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CAS NO (9050-31-1)
| Test | HP-55 | HP-55S | HP-50 |
| Dissolving pH | Starts @ 5.5 | Starts @ 5.5 | Starts @5.0 |
| Labelled Viscosity@20C | 40 cst | 170 cst | 55 cst |
| Viscosity in cst@20C | 32cst-48cst | 136cst – 204 cst | 44cst – 66cst |
| Nominal Phthalyl content | 31% | 31% | 24% |
| Phthalyl content | 27.0% - 35.0% | 27.0% - 35.0% | 21.0% - 27.0 % |
| Description & Solubility |
Conforms | Conforms | Conforms |
| Identification | Conforms | Conforms | Conforms |
| Water content | NMT 5.0% | NMT 5.0% | NMT 5.0% |
| Sulphated Ash | NMT 0.20% | NMT 0.20% | NMT 0.20% |
| Chloride | NMT0.07% | NMT0.07% | NMT0.07% |
| Heavy Metals | NMT 0.001% | NMT 0.001% | NMT 0.001% |
| Free Phthalic Acid | NMT 1.0% | NMT 1.0% | NMT 1.0% |
| PURITY (Dry Basis) | 99% (MIN) |
| Mn Content | 32% (MIN) |
| Chlorides | 0.002% Max |
| Fe | 0.005% Max |
| Pb | 15 PPM Max |
| Cd | 5 PPM Max |
| Hg | Nil |
| Arsenic | 5 PPM |
| Antimony | Nil |
| Bismuth | Nil |
| Zinc | 5 PPM Max |
| Nickel | 0.0064% Max |
| Cobalt | 0.0060% Max |
| Water Insoluble | 0.1% Max |
