Singapore legislation
Schedule 4
of Fire Safety (Petroleum and Flammable Materials) Regulations
Schedule 4
THIRD SCHEDULERegulation 31(f)
FOURTH SCHEDULERegulation 2(1) and (3)(b)Flammable materialsPart 1Schedule 1 chemicals1.O-Alkyl (≤C10, incl. cycloalkyl) N,N-dialkyl (Me, Et, n-Pr or i-Pr) phosphoramidocyanidatese.g. Tabun:O-Ethyl N,N-dimethyl phosphoramidocyanidate2.Sulfur mustards: (a)2-Chloroethylchloromethylsulfide (b)Mustard gas: Bis(2-chloroethyl)sulfide (c)Bis(2-chloroethylthio)methane (d)Sesquimustard: 1,2-Bis(2-chloroethylthio)ethane (e)1,3-Bis(2-chloroethylthio)-n-propane (f)1,4-Bis(2-chloroethylthio)-n-butane (g)1,5-Bis(2-chloroethylthio)-n-pentane (h)Bis(2-chloroethylthiomethyl)ether (i)O-Mustard: Bis(2-chloroethylthioethyl)ether[S 83/2023 wef 21/08/2023]Part 2Schedule 2 chemicals1.N,N-Dialkyl (Me, Et, n-Pr or i-Pr) phosphoramidic dihalides [excluding a mixture containing not more than 30% by weight of N,N-Dialkyl (Me, Et, n-Pr or i-Pr) phosphoramidic dihalide]2.N,N-Dialkyl (Me, Et, n-Pr or i-Pr) aminoethane-2-ols and corresponding protonated salts Excluding:
N,N-Dimethylaminoethanol and corresponding protonated salts (b)N,N-Diethylaminoethanol and corresponding protonated salts(c)any mixture containing not more than 30% by weight of —
N,N-Dialkyl (Me, Et, n-Pr or i-Pr) aminoethane-2-ol; (ii)any corresponding protonated salt; or
both combined.3.Pinacolyl alcohol: 3,3-Dimethylbutan-2-ol[S 83/2023 wef 21/08/2023]Part 3Schedule 3 chemicals1.Dimethyl phosphite [excluding a mixture containing not more than 30% by weight of dimethyl phosphite]2.Ethyldiethanolamine [excluding a mixture containing not more than 30% by weight of ethyldiethanolamine]3.Methyldiethanolamine [excluding a mixture containing not more than 30% by weight of methyldiethanolamine]4.Sulfur dichloride [excluding a mixture containing not more than 30% by weight of sulfur dichloride]5.Sulfur monochloride [excluding a mixture containing not more than 30% by weight of sulfur monochloride]6.Triethyl phosphite7.Trimethyl phosphite [S 83/2023 wef 21/08/2023]Part 4Other flammable materials1.Acetal2.Acetaldehyde diethylacetal3.Acetoin (3‑Hydroxybutanone)4.Acetone5.Acetyl chloride6.Acetyl methyl carbinol (Butanolone)7.Acetylene7A.Acetylpropionyle8.Acryloyl chloride9.The following Aldehydes: (a)Acetaldehyde (b)Acrolein (c)Butyraldehyde (d)2-Ethylbutyraldehyde (e)Glycidaldehyde (f)Isobutyraldehyde (g)Methacrylaldehyde, stabilised (h)Alpha-methylvaleraldehyde (i)Propionaldehyde (j)Valeraldehyde10.Allyl acetate11.Allyl bromide12.Allyl chloride13.Allyl formate14.Allyl iodide15.Allyl methacrylate15A.Aluminium16.Aluminium alkyl halides17.Aluminium alkyl hydrides18.Aluminium alkyls19.Aluminium borohydride20.Aluminium carbide21.Aluminium ferrosilicon powder22.Aluminium hydride23.[Deleted by S 780/2020 wef 14/09/2020]24.The following Amines: (a)Aminopropyldimethylamine (Dimethylaminopropylamine - DMAPA) (b)Amylamines (c)n-Butylamine (d)Diallylamine (e)Diethylamine (f)Diisopropylamine (g)Dimethyl-N-propylamine (h)Dimethylamine (i)1,3-Dimethylbutylamine (j)Dipropylamine (k)Ethylamine (l)Isobutylamine (m)Isopropylamine (n)Methylamine (o)N-Methylbutylamine (p)Propylamine (q)Triethylamine (r)Trimethylamine25.[Deleted by S 388/2025 wef 01/07/2025]26.[Deleted by S 388/2025 wef 01/07/2025]27.Amyl acetate28.Amyl butyrate29.Amyl chlorides30.Amyl mercaptan31.Amyl nitrites32.Azobis (dimethylvaleronitrile)33.Azobis (methylpropionitrile), Azobis‑isobutyronitrile34.Azodi (methylbutyronitrile)35.Azodicarbonamide36.Barium37.[Deleted by S 388/2025 wef 01/07/2025]38.Benzotrifluoride39.Bis‑cyclopentadienyl iron (Ferrocene)40.Boron trifluoride dimethyl etherate41.1‑Bromobutane42.Bromomethylpropane43.2‑Bromopentane44.Bromopropanes45.3‑Bromopropyne46.Bromotrifluoroethylene47.Butadienes48.Butanedione49.Butane50.Butanol (Butyl alcohol)51.Butene52.Butyl acetate53.n‑Butyl formate54.Butyl acrylate55.Tert‑butylamine56.Butyl butyrate57.Tert‑butyl hypochlorite58.Butyl isobutyrate59.Butyl isovalerate (Butyl 3‑Methylbutanoate)60.Butyl nitrites61.1,2‑Butylene oxide62.Butyryl chloride63.Calcium64.Calcium carbide65.Calcium dithionite (Calcium hydrosulfite)66.Calcium hydride67.[Deleted by S 780/2020 wef 14/09/2020]68.Calcium silicide69.Carbon disulfide70.Carbonyl iron powder71.Cerium72.Cesium (Caesium)73.Chlorobutane74.Chloroprene75.2‑Chloropropane76.2‑Chloropropene77.The following Chlorosilanes: (a)Dichlorosilane (b)Dimethyldichlorosilane (c)Ethyltrichlorosilane (d)Methyltrichlorosilane (e)Trichlorosilane (f)Trimethylchlorosilane (g)Vinyltrichlorosilane, stabilised78.1‑Chloro‑1, 1‑difluoroethane79.Compressed Natural Gas (CNG)80.Crestyl methyl ether para (1‑methoxy‑4‑methylbenzene)81.Cyclobutane82.Cyclohexanone83.Cyclohexyl acetate84.Cyclopentanone85.Cyclopropane86.Decaborane87.Deuterium88.1,2‑Di‑(dimethylamino)ethane89.Diacetone alcohol89A.Dibutylsulfure90.1,1‑Dichloroethane91.1,2‑Dichloroethylene92.1,2‑Dichloropropane93.Dichloropropene94.Dicyclohexylammonium nitrite95.Diethoxymethane96.3,3‑Diethoxypropene97.Diethyl carbonate98.Diethyl ketone99.Diethyl sulfide100.Diethylhydroxylamine 85%101.Diethylzinc102.Diethynyltertramethyldisiloxane (1,3‑Diethynyl‑1,1,3,3‑tetramethyldisiloxane)103.Difluoroethane104.1,1‑Difluoroethylene105.Difluoromethane106.2,3‑Dihydropyran107.Diisobutyl ketone108.1,2‑Dimethoxyethane109.1,1‑Dimethoxyethane110.Dimethyl carbonate111.Dimethyl disulfide112.Dimethyl ether113.Dimethyl hexynol114.Dimethyl sulfide115.Dimethyl trisulfide116.2,3‑Dimethylbutane117.Dimethylcyclohexane118.Dimethyldiethoxysilane119.Dimethyldioxane120.Dimethylformamide121.2,2‑Dimethylpropane121A.2,3-Dimethylpyrazine122.Dimethylzinc123.[Deleted by S 388/2025 wef 01/07/2025]124.[Deleted by S 388/2025 wef 01/07/2025]125.[Deleted by S 388/2025 wef 01/07/2025]126.Dioxane127.Dioxolane128.[Deleted by S 388/2025 wef 01/07/2025]129.Esters130.Ethane131.Ethanol132.The following Ethers: (a)Allyl ethyl ether (b)2-Bromoethyl ethyl ether (c)Butyl methyl ether (d)Butyl vinyl ether, stabilised (e)Chloromethyl ethyl ether (f)Diallylether (g)Diethyl ether (h)Diisopropyl ether (i)Di-n-propyl ether (j)Divinyl ether, stabilised (k)Ethyl butyl ether (l)Ethyl methyl ether (m)Ethyl propyl ether (n)Methyl tert-butyl ether (o)Methyl propyl ether (p)Perfluoro (ethyl vinyl ether) (q)Perfluoro (methyl vinyl ether) (r)Vinyl ethyl ether, stabilised (s)Vinyl isobutyl ether, stabilised (t)Vinyl methyl ether, stabilised133.Ethoxy propanol133A.Ethyl 2-Methyl-3-Pentenoate134.Ethyl 3‑ethoxypropionate135.Ethyl acetate136.Ethyl acrylate137.Ethyl borate138.Ethyl butyrate139.Ethyl caproate (Ethyl hexanoate)140.Ethyl chloride141.Ethyl crotonate142.Ethyl formate143.Ethyl isobutyrate144.Ethyl isocyanate145.Ethyl isovalerate146.Ethyl lactate147.Ethyl methacrylate148.Ethyl methyl butanoate149.Ethyl methyl butyrate150.Ethyl nitrite151.Ethyl propionate152.Ethyl silicate153.Ethylacetylene154.Ethylbenzene155.Ethyldichlorosilane156.Ethylene157.Ethylene glycol diethyl ether158.Ethylene glycol dimethyl ether159.Ethylene glycol monoethyl ether acetate160.Ethyloxypropanoic acid, ethyl ester161.1‑Ethylpiperidine162.Eucalyptol (1,8‑Cineol)163.Ferrocerium164.Fluorobenzene165.Fluorotoluene166.Furan167.Hafnium powder168.Heptaldehyde (Aldehyde C7)169.Heptanone170.Hexadiene171.Hexamethyldisiloxane172.Hexamethyleneimine172A.Hexenal Bionat K172B.Hexenone (4-Hexene-3-one)173.Hexenyl formate174.Hexyl acetate175.Hydrogen176.2‑Iodobutane177.Iodomethylpropane178.Isoamyl acetate179.Isoamyl alcohol 180.Isoamyl butyrate181.Isoamyl propionate182.Isobutane183.Isobutyl acetate184.Isobutyl formate185.Isobutyl isobutyrate186.Isobutyl isocyanate187.Isobutyl isovalerate188.Isobutylene189.Isobutyryl chloride190.Isopentyl formate191.Isopentyrate192.Isoprene193.Isopropanol (Isopropyl alcohol)194.Isopropenoxytrimethyl silane195.Isopropenyl acetate196.Isopropyl acetate197.Isopropyl isobutyrate198.Isopropyl isocyanate199.Isopropyl nitrate200.Isopropyl propionate201.Lead phosphite, dibasic202.Lithium203.Lithium alkyls204.Lithium aluminum hydride205.Lithium borohydride206.Lithium ferrosilicon207.Lithium hydride208.Lithium nitride209.Lithium silicon210.Lutidine210A.Magnesium211.Magnesium alkyls212.Magnesium diamide213.Magnesium diphenyl214.Magnesium hydride215.[Deleted by S 780/2020 wef 14/09/2020]216.Magnesium silicide216A.Mercaptobutanone217.Methane218.Methanol219.Methoxy acetoxypropane220.Methoxy methylethyl acetate221.Methoxy propanol acetate (1‑methoxy‑2‑propanol Acetate)222.Methoxy propyl acetate223.Methoxybutanol224.Methoxymethyl isocyanate225.Methoxypropanol226.Methyl acetate227.Methyl acetylene228.Methyl acrylate229.Methyl allyl chloride230.Methyl amyl ketone231.Methyl butanol232.Methyl butane233.Methyl butyraldehyde234.Methyl butyrate235.Methyl caproate (Methyl hexanoate)236.Methyl Ethyl Ketone (MEK)237.Methyl formate238.Methyl heptenone239.Methyl hexanone (Methyl isoamyl ketone)240.Methyl isobutyl carbinol241.Methyl isobutyl ketone (Methyl pentanone)242.Methyl isopropenyl ketone243.Methyl isovalerate244.Methyl magnesium bromide245.Methyl methacrylate monomer246.Methyl methoxypropionate247.Methyl methylbutyrate248.Methyl propionate249.Methyl propyl ketone250.Methylal251.3‑Methylbutan‑2‑one252.Methyldichlorosilane253.Methylfluoride (Fluoromethane)254.2‑Methylfuran255.n‑methylmorpholine256.Methylpentadiene257.1‑Methylpiperidine258.Methyltetrahydrofuran259.Methyltriethyloxysilane260.Methyltrimethoxysilane261.The following Nitriles: (a)Acetonitrile (b)Acrylonitrile, stabilised (c)Butyronitrile (d)2-Dimethylaminoacetonitrile (e)Isobutyronitrile (f)Methacrylonitrile, stabilised (g)Propionitrile262.[Deleted by S 388/2025 wef 01/07/2025]263.[Deleted by S 388/2025 wef 01/07/2025]264.[Deleted by S 388/2025 wef 01/07/2025]265.[Deleted by S 388/2025 wef 01/07/2025]266.[Deleted by S 388/2025 wef 01/07/2025]267.[Deleted by S 388/2025 wef 01/07/2025]268.Nitromethane 269.1‑Nitropropane (Nitropropane)270.p‑Nitrosodimethylaniline271.[Deleted by S 388/2025 wef 01/07/2025]272.Octamethyltrisiloxane273.Octanal (Aldehyde C8)274.Pentaborane275.Pentanol276.Pentyl acetate277.1,1,1,3,3‑pentafluorobutane (Pentafluorobutane)278.Phosphorus heptasulfide279.Phosphorus pentasulfide280.Phosphorus sesquisulfide281.Phosphorus trisulfide282.Phosphorus283.Potassium 284.Potassium borohydride285.Potassium dithionite (Potassium hydrosulfite)286.Potassium sodium alloys287.Potassium sulfide288.Prenyl acetate289.Propadiene290.Propane291.Propanethiol292.n‑Propanol293.Propionyl chloride294.n‑Propyl acetate295.Propyl butyrate296.Propyl chloride297.Propyl formate298.Propylene299.Propylene glycol monoethyl ether300.Propylene glycol monomethyl ether301.Propylene glycol monomethyl ether acetate302.n‑Propyl nitrate303.Propylene oxide304.Propyleneimine305.Pyridine306.Pyrrolidine307.Rubidium308.Silanes309.[Deleted by S 388/2025 wef 01/07/2025]310.Sodium311.Sodium aluminum hydride312.Sodium borohydride313.[Deleted by S 388/2025 wef 01/07/2025]314.Sodium dithionite (Sodium hydrosulfite)315.Sodium ethylate316.Sodium hydride317.Sodium hydrosulfide318.Sodium methylate319.[Deleted by S 388/2025 wef 01/07/2025]320.Sodium sulfide321.Strontium322.Terpineol323.Tetraethyl orthosilicate324.Tetraethylsilicate325.Tetrafluoroethylene326.Tetrahydrofuran327.1,2,3,6‑Tetrahydropyridine328.Tetrahydrothiophene329.Tetrakis (dimethylamino) hafnium330.Tetrakis (dimethylamino) titanium331.Tetramethylsilane 332.Thioacetic acid333.Thiophene334.Thiourea dioxide335.Tifluoromethyl propanol336.Titanium hydride337.Titanium powder338.Titanium trichloride338A.Trans-2 Hexenal339.Tributylphosphane340.Triethylboron341.Triethyl borate342.Triethyl silane343.1,1,1‑Trifluoroethane344.Triisopropyl borate345.Trimethyl gallium346.Trimethyl borate347.Trimethyl silane348.[Deleted by S 388/2025 wef 01/07/2025]349.[Deleted by S 388/2025 wef 01/07/2025]350.[Deleted by S 388/2025 wef 01/07/2025]351.[Deleted by S 388/2025 wef 01/07/2025]352.Tris(isopropylcyclopentadienyl) Lanthanum353.[Deleted by S 388/2025 wef 01/07/2025]354.Vinyl acetate355.Vinyl acetylene356.Vinyl bromide357.Vinyl butyrate358.Vinyl chloride359.Vinyl fluoride360.Vinylidene chloride361.Vinyltrimethoxysilane362.Xanthates363.Zinc 364.Zirconium hydride365.[Deleted by S 388/2025 wef 01/07/2025]366.Zirconium powder[S 388/2025 wef 01/07/2025][S 188/2014 wef 17/03/2014][S 780/2020 wef 14/09/2020][S 83/2023 wef 21/08/2023]