Organic materials are protected from the harmful effects of heat, atmospheric oxygen or ultra-violet radiation by incorporating in or applying to the organic material a compound of the formula <FORM:1114861/C3/1> where X represents a hydrogen atom or an organic residue bound to the sulphur atom through a carbon atom, Y represents a benzene ring linked to the triazine ring through a cyclic carbon atom and which is substituted in the ortho position to the bond with the triazine ring by an hydroxyl group and in the para position by an hydroxyl or etherified hydroxyl group or by a group of the formula <FORM:1114861/C3/2> where n: 1 or 2 and D represents a hydrocarbon or substituted hydrocarbon residue, and Z represents a benzene residue which may be substituted. The compounds are suitably employed in an amount of 0.01 to 10% by weight of the organic material to be treated which includes polyacrylonitrile, PVC, a polyolefin, polyvinylidene chloride, a copolymer from vinyl chloride and vinylidene chloride, an alkyd lacquer, a polyester resin, a vinyl resin, a polystyrene resin, natural rubber-like materials, synthetic vulcanizable materials, polyesters, polyamides, alkyd resins, aldehyde resins, e.g. condensation products of formaldehyde with phenol, urea or melamine, and epoxy resins. The compounds may also be incorporated in lacquers and films of acetylcellulose, cellulose propionate, cellulose butyrate, cellulose acetate/butyrate and cellulose acetate/propionate mixtures, and nitrocellulose. In examples the compounds are incorporated with (25)an acetonic solution of acetyl cellulose, (26) a polyvinylchloride foil, (27) a polyethylene foil, (28) a polypropylene sheet, (29) a polyester sheet obtained by reacting monostyrene with an unsaturated polyester resin based on maleic acid, phthalic acid, and ethylene glycol, (30) a polyamide filament derived from caprolactam, (31) a polyacrylonitrile foil, (32) a polystyrene sheet, (33) a foamed fleece derived from commercial tolylene diisocyanate and a branched ester derived from adipic acid/diethylene glycol and trimethylol propane, (34) a nitrocellulose lacquer.ALSO:Organic materials, such as pelts hides and leather, are protected from the harmful effects of heat, atmospheric oxygen or ultraviolet radiation by incorporating in or applying to the organic material a triazine compound of the formula: <FORM:1114861/C6-C7/1> where Z represents a benzene residue, which may be substituted, X represents a hydrogen atom or an organic residue bound to the sulphur atom through a carbon atom, and Y represents a benzene ring, which is linked to the triazine ring through a cyclic carbon atom, and is substituted, in the ortho position to the bond with the triazine ring, by a hydroxyl group, and in the para position by a hydroxyl or etherified hydroxyl group or by a group of the formula: <FORM:1114861/C6-C7/2> where n = 1 or 2 and D represents a hydrocarbon or substituted hydrocarbon residue. The compounds are suitably employed in an amount of 0.01 - 10% by weight of the organic material to be treated. Other organic materials, which may be protected are feathers and hairs.ALSO:Hydroxyphenyl-1,3,5-triazines of the formula <FORM:1114861/C2/1> where X represents a hydrogen atom or an organic residue bound to the sulphur atom through a carbon atom, Y represents a benzene ring linked to the triazine ring through a cyclic carbon atom and which is substituted in the ortho position to the bond with the triazine ring by a hydroxyl group and in the para position by a hydroxyl or etherified hydroxyl group or by a group of the formula <FORM:1114861/C2/2> where n = 1 or 2 and D represents a hydrocarbon or substituted hydrocarbon residue, and Z represents a benzene residue which may be substituted, are obtained by reacting one mole of a halo-1,3,5-triazine having a halogen atom attached to a first carbon atom of the triazine nucleus, having a group -SX or -Y1 attached to a second carbon atom of the triazine nucleus, and having attached to the third carbon atom of the triazine nucleus a group -Z or, when the second carbon atom has the group -SX attached, a halogen atom or a group -Z, where Y1 is a group of the formula <FORM:1114861/C2/3> with one mole of a compound of the benzene series that contains two hydroxyl groups in the meta position relative to each other, to introduce a desired group Y, or with two moles of such a benzene compound to introduce desired groups Y and Z, or with one mole of a mercaptan or thiophenol or alkali metal salt thereof to introduce a desired group -SX, in an anhydrous organic solvent and, if necessary, in the presence of a Friedel-Crafts catalyst or an acid acceptor and then, when necessary to provide a desired etherified hydroxyl group or group of formula <FORM:1114861/C2/4> in the p-position on group Y or on groups Y and Z, the product of the preceding step is etherified with an organic halide in an inert organic solvent in the presence of an acceptor, or is esterified or converted to a urethane group with an acid halide or anhydride or with an isocyanate in the presence of a tertiary amine or an inert organic solvent. Compounds which are claimed to be novel and which fall within the scope of the general formula of the compounds prepared above have the general formula <FORM:1114861/C2/5> wherein X1 is a 2-benzthiazolyl group or a group of formula <FORM:1114861/C2/6> wherein h and k are identical or different and each represents a hydrogen or halogen atom or an alkyl group containing up to 8 carbon atoms, l represents a hydrogen or halogen atom or an alkyl group containing up to 8 carbon atoms, or a thiol, carboxyl, nitro, amino, or phenyl group, or a carbalkoxy or alkoxy group containing up to 8 carbon atoms, R represents a hydrogen atom or an alkyl group containing up to 18 carbon atoms which may be substituted by a chlorine atom or by a hydroxyl, cyano, carboxyl, carbalkoxy, or carbamyl group, an aralkyl or alkenyl group containing up to 9 carbon atoms or a residue of the formula <FORM:1114861/C2/7> where n = 1 or 2 and D2 is an alkyl group containing up to 18 carbon atoms or a phenyl group which may be substituted by a chlorine atom or by a phenyl or hydroxyl group or by an alkyl or alkoxy group containing up to 8 carbon atoms u is a hydrogen or halogen atom or an alkyl or alkoxy group containing up to 8 carbon atoms or a phenyl group, and v is a hydrogen or halogen atom or an alkyl group containing up to 8 carbon atoms, or when X1 is other than a 2-benzthiazolyl group the substituents u and v are independently groups -OR in the ortho and para positions respectively to the bond with the triazine ring. The reaction of the halogenotriazines with the 1,3-dihydroxybenzenes may be effected at 0-150 DEG C. in an inert solvent preferably in the presence of 0.3-3 mols per mol of 1,3-dihydroxybenzene of a Friedel-Crafts catalyst, e.g. sodium aluminium fluoride, tin tetrachloride, boron trifluoride, ferric chloride and aluminium tribromide or trichloride. The free hydroxyl groups in the products may be etherified, as described above, with an organic halide or an alkylating agent which is employed in an inert solvent in the presence of a preferably stoichiometric proportion of an acid acceptor at 20-100 DEG C. The free hydroxyl groups in the products may also be converted into urethane groups by reaction with an appropriate isocyanate, preferably in the presence of a tertiary amine and optionally in an inert organic solvent. The free hydroxyl groups in the products may also be esterified by reaction with an acid halide or acid anhydride in the presence of a tertiary amine, optionally in the presence of an inert solvent, at a temperature of from 0 DEG C. to the boiling point of the system the esterification may also be effected in a high-boiling solvent in the absence of a tertiary amine with an acid halide or anhydride at a temperature of 80-170 DEG C. Many examples are given and the products are stated to be useful for protecting organic materials from the harmful effects of heat, atmospheric oxygen or ultra-violet radiation.ALSO:Organic materials are protected from the harmful effects of heat, atmospheric oxygen or ultra-violet radiation by incorporating in or applying to the organic material a compound of the formula: <FORM:1114861/D1-D2/1> where X represents a hydrogen atom or an organic residue bound to the sulphur atom through a carbon atom Y represents a benzene ring linked to the triazine ring through a cyclic carbon atom and which is substituted in the ortho position to the bond with the triazine ring by a hydroxyl group and in the para position by a hydroxyl or etherfied hydroxyl group or by a group of the formula: <FORM:1114861/D1-D2/2> where n : 1 or 2 and D represents a hydrocarbon or substituted hydrocarbon residue and Z represents a benzene residue which may be substituted. The compounds are suitably employed in an amount of 0.01 - 10% by wt. of the organic material to be treated which may be a textile material in any desired form e.g. in the form of fibres, filaments, yarns, woven or knitted fabrics or as felt, and articles manufactured therefrom such textile materials may consist of natural materials of animal origin, e.g. wool, or silk, or of vegetable origin such as cellulose materials from cotton, hemp, flax, linen and jute also of semi-synthetic materials such as regenerated cellulose or synthetic materials accessible by polymerisation or copolymerisation, e.g. polyacrylonitrile, polyvinyl chloride or polyelefines, or those which are accessible by polycondensation such as polyesters and polyamides, or p polyadducts, e.g. polyurethanes. Other organic materials which may be treated include paper, cardboard and paper pulps used in the manufacture of paper (e.g. hollander pulps).ALSO:Organic materials are protected from the harmful effects of hea