The permit was repealed on 21-11-16.
PERMONITE.—A potassium perchlorate explosive made by the Carbonite Syndicate at Schlebusch in Germany. A number of mixtures have been placed on the market, but they do not differ from one another very much. One which was on the old British Permitted List was—
| Potassium perchlorate | 32·2 |
| Ammonium nitrate | 41 |
| Nitroglycerine | 3·5 |
| Collodion cotton | 0·3 |
| Trinitro-toluene | 12 |
| Starch | 8 |
| Wood meal | 3 |
See also [Gesteins Leonit].
PERRUMPIT.—A German coal-mine explosive containing ammonium nitrate, sodium nitrate, vegetable meal, fatty oils, graphite and aluminium, cooling agents such as ammonium oxalate or sodium chloride, and not more than 15 per cent. of trinitro-toluene.
PERSALIT is a German perchlorate explosive made by the Westfälisch-Anhaltische Sprengstoff A.-G. It contains not more than 77 per cent. of an alkali or alkali earth perchlorate, organic matter such as hydrocarbons, resins, meal or nitrated hydrocarbons (with the proviso that if the percentage of perchlorate exceed 70, there must not be more than 10 per cent. of trinitro-toluene). There must also be not less than 4 per cent. of ammonium nitrate, and there may be an addition of sodium nitrate or other salt that does not increase the sensitiveness.
WETTER-PERSALIT is a similar explosive, but has been modified to make it more suitable for use in coal mines. It contains not more than 35 per cent. of potassium perchlorate, not more than 25 per cent. of ammonium nitrate, aromatic nitro-compounds of which not more than 20 per cent. must be trinitro-toluene, vegetable meal, not more than 6 per cent. of nitroglycerine, sodium nitrate, and neutral salts. It is similar to [Neu-Leonit].
PETROKLASTIT or HALOKLASTIT is a modified gunpowder mixture used in Germany in potash mines and stone quarries. It contains sodium nitrate, sulphur, coal-tar pitch, potassium nitrate, not more than 1 per cent. of potassium bichromate, and may have up to 10 per cent. of charcoal, as, for instance—
| Sodium nitrate | 69 |
| Potassium nitrate | 5 |
| Sulphur | 10 |
| Coal-tar pitch | 15 |
| Potassium bichromate | 1 |
It is more powerful than ordinary blasting powder, and somewhat less sensitive to blows. This explosive is also made in Switzerland.