| N0049 | Neon | 010401 | N0040 |
| N0051 | Neptunium | 010402 | N0041 |
| N0069 | Neutralizers (Toxic gas –) | 010403 | N0057 |
| N0084 | Nitrate of uranium | 010405 | U0009 |
| N0085 | Nitrate paper | 010416 | P0104 |
| N0086 | Nitrates | 010572 | N0069 |
| N0087 | Nitric acid | 010095 | A0880 |
| N0088 | Nitric monoxide | 010093 | P0964 |
| N0089 | Nitrite (Bismuth –) for chemical purposes | 010494 | B0437 |
| N0091 | Nitrogen | 010092 | A0877 |
| N0092 | Nitrogenous fertilisers | 010094 | A0879 |
| N0093 | Nitrogenous lime [manure] | 010141 | C1647 |
| N0094 | Nitrous oxide | 010093 | P0964 |
| N0122 | Nuclear reactors (Moderating materials for –) | 010179 | M0419 |
| N0139 | Nuts (Gall –) | 010319 | N0091 |
| O0015 | Oenological bactericides [chemical preparations used in wine making] | 010096 | B0010 |
| O0021 | Oil (Synthetic materials for absorbing –) | 010620 | A0015 |
| O0027 | Oil dispersants | 010352 | H0135 |
| O0034 | Oil-bleaching chemicals | 010353 | H0136 |
| O0036 | Oil-purifying chemicals | 010354 | P0992 |
| O0038 | Oil-separating chemicals | 010233 | H0137 |
| O0046 | Oils for currying leather | 010601 | H0161 |
| O0049 | Oils for preparing leather in the course of manufacture | 010349 | H0153 |
| O0051 | Oils for tanning leather | 010350 | H0160 |
| O0052 | Oils for the preservation of food | 010348 | H0155 |
| O0057 | Oleic acid | 010407 | O0041 |
| O0063 | Olivine [chemical preparations] | 010408 | O0049 |
| O0069 | Opacifiers for enamel or glass | 010264 | O0067 |
| O0096 | Organic-bleaching chemicals | 010129 | B0465 |
| O0132 | Oxalates | 010411 | O0153 |
| O0133 | Oxalic acid | 010412 | O0154 |
| O0136 | Oxygen | 010413 | O0161 |
| P0045 | Paints (Chemical preparations for the manufacture of –) | 010575 | C1353 |
| P0059 | Palladious chlorides | 010415 | P0047 |
| P0103 | Paper pulp | 010156 | P0183 |
| P0111 | Paperhanging (Adhesives for –) | 010203 | C1014 |
| P0113 | Papers (Diazo –) | 010245 | P0097 |
| P0181 | Peat [fertiliser] | 010539 | T0404 |
| P0186 | Peat pots for horticulture | 010445 | P0855 |
| P0187 | Pectin [photography] | 010420 | P0247 |
| P0236 | Perborate of soda | 010421 | P0304 |
| P0237 | Percarbonates | 010422 | P0305 |
| P0239 | Perchlorates | 010423 | P0310 |
| P0257 | Persulphates | 010424 | P0326 |
| P0258 | Persulphuric acid | 010425 | P0327 |
| P0269 | Petroleum dispersants | 010351 | P0345 |
| P0280 | Phenol for industrial purposes | 010426 | P0357 |
| P0284 | Phonograph records (Compositions for the manufacture of –) | 010603 | C1083 |
| P0285 | Phonograph records (Renovating preparations for –) | 010246 | D0219 |
| P0286 | Phosphates [fertilisers] | 010427 | P0360 |
| P0288 | Phosphatides | 010429 | P0362 |
| P0289 | Phosphoric acid | 010433 | P0364 |
| P0290 | Phosphorus | 010430 | P0363 |
| P0294 | Photographic developers | 010435 | R0271 |
| P0295 | Photographic emulsions | 010267 | E0274 |
| P0296 | Photographic paper | 010322 | P0110 |
| P0299 | Photographic sensitizers | 010436 | S0220 |
| P0304 | Photography (Chemical preparations for use in –) | 010211 | P0372 |
| P0305 | Photography (Reducing agents for use in –) | 010027 | A0146 |
| P0307 | Photometric paper | 010417 | P0106 |
| P0308 | Photosensitive plates | 010213 | P0575 |
| P0328 | Picric acid | 010437 | P0406 |
| P0340 | Pigments (Chemical preparations for the manufacture of –) | 010575 | C1353 |
| P0423 | Plant growth regulating preparations | 010634 | R0187 |
| P0444 | Plasticizers | 010143 | P0580 |
| P0445 | Plastics (Dispersions of –) | 010605 | D0211 |
| P0447 | Plastics, unprocessed | 010438 | M0212 |
| P0448 | Plastisols | 010439 | P0586 |
| P0457 | Plates (Photosensitive –) | 010213 | P0575 |
| P0460 | Plates (Sensitized photographic –) | 010269 | P0574 |
| P0463 | Plates for offset printing (Sensitized –) | 010406 | P0576 |
| P0492 | Plutonium | 010442 | P0633 |
| P0513 | Polish removing substances | 010238 | D0097 |
| P0529 | Polonium | 010443 | P0706 |
| P0555 | Potash | 010446 | P0834 |
| P0556 | Potash water | 010448 | E0063 |
| P0557 | Potassium | 010447 | P0836 |
| P0558 | Potassium dioxalate | 010123 | B0427 |
| P0563 | Potato flour for industrial purposes | 010444 | P0716 |
| P0569 | Pots (Peat –) for horticulture | 010445 | P0855 |
| P0600 | Power steering fluid | 010643 | F0308 |
| P0605 | Praseodymium | 010449 | P0891 |
| P0607 | Precious metals (Salts of –) for industrial purposes | 010391 | S0202 |
| P0614 | Preservatives (Brickwork –), except paints and oils | 010381 | B0799 |
| P0615 | Preservatives (Cement –), except paints and oils | 010196 | C0837 |
| P0616 | Preservatives (Concrete –), except paints and oils | 010117 | B0334 |
| P0617 | Preservatives (Flower –) | 010209 | F0288 |
| P0618 | Preservatives (Masonry –), except paints and oils | 010380 | M0017 |
| P0622 | Preservatives for pharmaceutical preparations | 010210 | C1161 |
| P0623 | Preservatives for tiles, except paints and oils | 010540 | T0549 |
| WIPO Nice Classification - Class 1 7/10 | |||