Latest ammonium polysulfide Tenders | Government ammonium polysulfide Tenders

State Government

CTN :41625454

02 Dec, 2025 8.99 Lacs

Surat - Gujarat

Tender For corrigendum : supply of fine chemicals, pvc ware & glassware for chemical lab ugbps - 1-amino 2-nephal 4-sulphonic acid, 2,4-dinitrophenyl hydrasine (100gm), acetaldehyde 500ml, acetamide (500gm), acetanilide (500gm), acetic acid (glacial), acetone, acetophenone 500ml, acetyl chloride 500ml, aluminium sulphate, amino acid f rgt for silca analyser make hach 5000make :hachcat no:2353103pack:2.9lit bottle, ammonia buffer solution, ammonia solution, ammonium bi carbonate (500gm), ammonium carbonate, ammonium iodide 100gm, ammonium molybdate, ammonium oxalate, ammonium pur-sulphate, ammonium salt (500gm), ammonium sulphate, carbon tetra chloride ar, barium nitrate, barium sulphate, benzaldehyde (500ml), benzene, benzoic acid, bleaching powder (500gm), blotting paper (sheet), borax (500gm), boric acid, calcium acetate ar, calcium hydroxide (500gm), calcium sulphate, zinc chloride, chloride standard solution.cat.no.18349.volume:500ml.concentration:1000mg/l., chloroform pkg 2.5 ltrs, citric acid pkg. 500 gms, citric acid surfactant f/h1 temp for silica analyser 5000 packing :29gm make: hach, cleaning brush 774649, conductivity cell,type glass,cd 30,constant 0.1 for condymeter 306,systronics, conductivity cell type glass cd 30 constant 1.0 for condymeter 306 systronics, conical flask borosil 100ml (glass wares), copper standard solution.cat.no.12932.volume:100ml.concentration:10mg/l., copper sulphate, dropper 6 glass, dropping bottels stand wooden, dropping bottle 125ml plastic, erechrom black-t (solochrome black-t), ethyl methyl ketone (500ml)

CTN :42181347

19 Nov, 2025 70.0 Thousand

Tirunelveli - Tamil Nadu

Tender For bid to ras supply of chemistry laboratory consumable items e e - sulphuric acid , nitric acid , hydrochloric acid , ammonium chloride , sodium hydroxide , calcium oxide powder , potassium permanganate , copper metal turnings , magnesium metal ribbon , copper sulphate , phenolphthalein , ammonia solution , methyl orange indicator , acetic acid , ethanol , sodium sulphate anhydrous , barium chloride , silver nitrate solution , carbon tetra chloride , carbon disulphide , magnesium chloride , calcium sulphate , litmus blue solution , ph indicator paper , ferric chloride , litmus red solution , sodium carbonate , ferrous sulphate , ammonium ferrous sulphate , oxalic acid , calcium carbonate , ammonium carbonate , nesslers reagent , ammonium oxalate , lead acetate , acetone , sodium nitrite , aluminium nitrate , filter paper , ammonium sulphate , zinc carbonate , sand paper , potassium sulphate , pot.thiocyanate , zinc chloride , fehling solution 1 , fehling solution2 , aniline , ammonium cerric nitrate , chromatographic paper , glass tube , china dish , crucible tongs , volumetric flask 2l , volumetric flask 3l , test tube , funnel 2.5inch , burette , glass rod 12inch , separating funnel , rubber cork-assorted , thistle funnel , wire gauze , capillary tube for melting , dropper

CTN :42228238

19 Nov, 2025 11.72 Lacs

Mohali - Punjab

Tender For bid to ras bid to ras corrigendum : supply of procurement of expandable medical stores c c - 11465 , 140112 , 140113 , 101002 , 101004 , 101049 , 120108 , 100827 , 12616 , 100435 , 100585 , 100165 , 101128 , 101156 , niv 10 , niv15 , niv25 , niv30 , niv31 , niv46 , niv50 , niv51 , niv77 , niv158 , niv , niv48 , niv160 chlorxynelol sol pot hydroxide 13 g choxylenol solution 50.5 gms, nitrile gloves non sterile medium size, nitrile gloves non sterile large size, mineral trioxide aggregate (mta) pkt of 1gms, set f 6 percent niti tappered files25 mm length corresponding gp and pp, dental implants with surgical kit abutents and analogs complete, surgicalcaps disposable, stick tracing greenpkt of 10, antimicrobial hand gel contaiing ethyl alcohol 60 percent, teeth acrylic set of 28 complete, spray anaesthetics surface bott of 100 ml, rvg sleevespkt of 1000, endodontic file system for retreatment, chlorhexidine gluconate mouth wash bott of 100 ml, calci pulp / calcium hydroxide syringe, flowable composite, protaper files for hand use, elastomeric chain, ss wire preformed16x22, root canal disinfactant 15 ml bott, composite polishing kit airotor, composite finishing kit airotor, hyflex niti rotary files assorted, crown preparation kit all ceramic, korsolex plus bott of 500 ml, lentulo spiral pkt of 6, metal cutting disc 33x 22mm, diamond disc double sided unmounted for dental use, flexi denture polishing kit, all ceramic polishing kit, virkon virucidal disinfactant powder, dfs sintered diamond bur 55021,55181,55600, dfs sintered diamond bur 59610, dfs sintered diamond bur 57202, dfs sintered diamond bur 57242, 57232, wheel ) /bid number : gem/2025/b/6639199 * /dated: 10-10-2025 & & / bid document 1 / 56

CTN :42635190

22 Nov, 2025 NA

East Sikkim - Sikkim

Tender For corrigendum : supply of telmisartan 40mg and amlodipine 10 mg tab , aspirin 150 mg tab , atenolol 50mg and amlodipine 5 mg tab , clonidine 100 mcg tab , phenylepherine 10 mg oblique ml 1 ml inj , ramipiril 10 mg tab , enalapril 5 mg tab , telmisartan 40 mg and hydrochlorthiazide 12. 5 mg tab , tab bisoprolol 5 mg , tab metoprolol 12. 5mg , tab nebivolol 20 mg , tab propranol 20 mg , paraformaldehyde tab , tab cilnidipine 5 mg , frusemide 20 mg 2 ml inj , terlipressin 1mg and 5ml sterile diluent inj , polidocanol 3 percentage 2ml inj , pancreatic enzyme supplement with a lipase content of 25000 units or more cap , tab entacavir 0. 5 mg , antacid chewable containing ai oh 3 300mg mg silicate 25 mg and simethicone 25 mg or megaldrate 480mg and simethicone 20mg , tab trypsin chymotrypsin , lactic acid bacillus sachet , tab oblique cap dicyclomine 10mg , bisacodyl 5 mg tab , magnesium sulphate 50 percentage w oblique v inj , human insulin analogue rapid acting inj, 100 iu oblique ml recombinant dna origin 300 iu disposable pen with 5 needles per pen , neostigmine 0. 5 mg 1 ml inj , cisatracurium 2 mg oblique ml inj 10 ml vial , ketorolac tromethamine 0. 4 percentage eye drops , clonazepam 0. 5 mg tab , zolpidem 10 mg tab , paroxetine xr 12. 5 tab , ipratropium bromide respirator soln 500 mcg oblique 2 ml respule , levosalbutamol sulphate 2. 5 ml containing 1. 25 mg respule , tiotropium bromide 9 mcg 120 metered doses oblique unit inhaler , cream luliconazole 1percentage tube of 15 gm , dextrose 50 percentage 25 ml inj , dextrose inj 25 percentage 25 ml inj , sterile water for amp of 10 ml , disodium hydrogen syp , cilostazole tab 100 mg , drotaverine hcl 40 mg tab , vitamin b complex with a minimum concentration of vit b1-5mg vit b6-3mg and vit b12-5mcg therapeutic tab oblique cap , b1 50mg inj , calcium carbonate 500mg tab elemental and vit-d-3-200iu to 250iu tab , multi vit inj iv 2-10 ml with minimum constituents having thiamine b1-30mg oblique ml pyridoxine b6 30mg oblique ml and b12 cyanocobalamin300mcg oblique ml , multivitamin drops with constituents having vit a vit b1 vit b2 vitb6 vit c vit d bottle of 15ml dosages as per recommended daily allowances , ethambutol 800mg tab , glucosamine 250mg and chondroitin sulphate 200 mg cap , tab tenofovir and lamivudine and efavirenz , inj azithromycin 500 mg , inj colistin 3 million iu , efavirenz 600 mg tab , cap oseltamivir 75 , tab thyroxin sodium 75 mcg , tab dapagliflozin 10 mg , inj nitroglycerine obblique glyceryltrinitrate 5 mg , antacid chewable containing dried aluminium hydroxide ip 250mg mag hydroxide nf 250 mg methyl polysiloxane 50 mg tab , tab methotrexate 15 mg , inj thiamine 100mg oblique ml 2ml amp , inj diclofenac 75 mg oblique ml 1ml amp for iv bolus , inj ropivacaine 7. 5 mg oblique ml 10ml inj , promethazine hcl 2. 5 percentage 25 mgm oblique ml 2ml inj , diethylcarbamazine 50mg tab , ethambutol 200mg tab , primaquine 7. 5mg base tab , quinine 300mg tab , inj benzathine penicillin 1. 2mu , trihexyphenidyl hcl 2 mg tab , diltiazem controlled delivery 90mg tab , tab apixaban 2. 5 mg , lignocaine hcl solution 2 percentage for iv use 50 ml inj , ivabradine 5 mg tab , digoxin 0. 25 mg tab , clove oil bottle of 50ml , calamine 8 percentage with 10 percentage light liquiid paraffin , betamethasone dipropionate usp 0. 05 mg and gentamycin 1 mg oblique gm tube of 20 gm , sacubitril 24 mg and valsartan 26 mg , human albumin 20 percentage in bott of 100ml , mebeverine hcl 135mg tab , carboprost tromethamine 250 mcg oblique ml 1 ml inj , nor //bid details2 / 105ethisterone 5mg tab , pyridostigmine 60 mg tab , vecuronium bromide 4mg oblique ml 1ml inj , sevelamir 400 mg tab , inj darbepoetin alpha 40 mcg , fluoxetine hcl 20 mg cap , budesonide 3 mg cap , etophylline bp 84. 7 mg and theophylline ip 25. 3 per ml 2ml inj , dextrose monohydrate for oral use in pack of 100 gm with or without vitamins and minerals , anti phlebitis cream tube of 15g oblique 20g , benzathine penicil

CTN :42635226

22 Nov, 2025 6.70 Lacs

East Sikkim - Sikkim

Tender For corrigendum : supply of nortriptylline 25mg tab , olmesartan 40mg tab , orciprenaline 10 tab , oxcarbazepine 300mg tab , pantoprazole 40 mg plus domperidone10mg tab , pancreatine 25000 tab , piracetam 400mg , prednisolone 5mg tab , pregabalin 75mg tab , propranolol 40mg tab , phenytoin sodium 300mg tab , ramipril 2. 5mg tab , ramipril 5mg tab , rabiprazole 20 plus levosulpiride 75mg tab , ripaglinide 1mg , rosuvastatin 10mg tab , rosuvastatin 20mg tab , saroglitazar 4mg tab , sacubitril 24mg plus valsartan 26mg tab , silodosin 8mg tab , sitagliptin 50mg tab , sodium bicarbonate 500mg tab , sodium valproate 300mg tab , tamsulosin 0. 4mg tab , tamsulosin 0. 4mg plus dutasteride 0. 5mg tab , taurine puls acetylsystine tab , telmisartan 20mg tab , telmisartan 40mg tab , telmisartan 80mg tab , telmisartan 40 mg plus hydrochlorothiazide 12. 5 mg tab , tenofovir 300mg tab , tenofovir 25mg tab , lmethylfolate-2. 8 mg plus mecobalamin 2 mmg plus pyridoxal phosphate 25 mg tab , toficitanib citrate 5mg tab , torsemide 5mg tab , torsemide 10mg tab , ursodeoxycholic acid 300mg udca tab , vildagliptin 50mg tab , voglibose 0. 3mg tab , vitamin e 400 mg caps , syrup terbutaline sulphate 1. 25 mg plus bromhexine hcl 4 mg plus guaiphenesin 50 mg, per 5 ml, bottle of 100 ml , disodium hydrogen citrate syp , digestive enzyme syp , syp dextromethorphan hydrobromide 5mg, chlorpheniramine maleate 2. 5mg, guaiphenesine 50mg and sodium citrate 57. 03mg per 5 ml bott of 100ml , lactulose syp , multivitamin syp , pen degludec , inj t t , inj heparin 25000iu , povidone iodine ont , clotrimazole cream , luliconazole cream , mupirocin oint , diclofenac gel , diclofenac spray , povidone iodine gargle , povidone iodine solution , desensitizing paste , ciprofloxacin eye drop , moxifloxacin eye drop , cholecalciferol sachet , oral rehydration salt sachet ors , knee cap medium , knee cap large , av fistula needle 17g , blood tubing set for hemodialysis , chlorzoxazone 500 mg plus diclofenac sodium 50 mg tab , montelukast plus levocetrizine tab , sitagliptin 50mg plus metformin 500mg tab , sitagliptin 50mg plus metformin 1gm tab , antacid gel aluminium hydroxide antacid magnesium hydroxide antacid and oxetacaine local anaesthetic , inj glargin pen 100 iu oblique ml r- dna origin , inhaler formoterol fumarate and budesonide 200mg , carboxymethylcellulose 1 presenage e oblique d , dialyzer set //bid details2 / 59

CTN :42771602

25 Nov, 2025 NA

Bareilly - Uttar Pradesh

Tender For supply of ms4se transflux - ms4se transflux , ms4se card , microscope slide cover slip , potassim hydroxide 500 gm , ms4se cbc 3 d hematology control , erba 360 xl multical kit , erba 360 control path kit , hypo solution bottle 500 ml , 100 x oil immersion lense dinesh scientific model number ds tm 100 , leishman stain 500 ml , giemsa stain 500 ml , plastic ice box 3 ltr

Central Government And Public Sector

CTN :42773982

06 Dec, 2025 7.70 Lacs

Jammu - Jammu And Kashmir

Tender For procurment of lab materials c c - buffer solution ph4.00 crm , potassium chloride crm , sodium chloride crm , potassium bi iodatecrm , hydrazine sulphate , ammonium hydroxide , sodium hydroxide , sodium iodide , potassium hydroxide , potassium iodide , potassium chromate , ferroin indicator , starch soluble , sodium azide , mangnous sulphate , glucose , glutamic acid , ferric chloride , sulphuric acid , sodium thiosulphate , dipotassium hydrogen phosphate , oxalic acid , ethanol , sodium hypochloride , ammonium chloride , hydrochloric acid , nitric acid , magnesium chloride , cod vials , lauryl tryptose , brilliant green bile broth , e-coli broth , sulphanilamide , sodium oxalate , ferrous ammonium sulphate , potassium permanganate , hand sanitiser , conductivity electrode , ph electrode , ph meter , filter paper , silt tube 5ml , silt tube 2ml , glass funnel , red mercury thermometer , tissue paper , potash alum , laboratory test sieves , enamelled bowl , china clay bowl , metallic bottle , enamel bucket with lid , silica gel , enamel tray , micropipette 0.1-1 ml , micropipette 1-5 ml , micropipette 1-10 ml , micropipette tip 0.1-1 ml , micropipette tip 0.5-10 ml , dropper bottle , washing jet bottle , aspirator bottle , tray , micropipette stand , plastic bottle 100 ml , plastic bottle 250 ml , magnet retriever , burette stand , pipette controller , durham tube , beaker 100 ml , beaker 50 ml , beaker 25 ml , glass burette 25 ml , bod bottle , glass bottle 125 ml , glass bottle 250 ml , glass bottle 500 ml , glass bottle 1000 ml , glass rod , volumetric flask 250 ml , measuring cylinder 100 ml , pipette 5ml , aluminium foil , spatula 6 inch , spatula 8 inch , spatula 10 inch , dust bin with lid , plastic bucket ) /bid number : gem/2025/b/6895057 * /dated: 15-11-2025 & & / bid document 1 / 53

CTN :42780868

26 Nov, 2025 NA

Udhampur - Jammu And Kashmir

Tender For supply of expendable dental surgery materials - syringe disposable plastic sterile 5 ml with needle , antiseptic oral pain relieving topical gel in gm or ml mucopain , denture cleaner tablets pack of 30 to 40 tablets , facial tissue napkin pkt of 100 , patient bib plastic , calcium hydroxide with iodoform root canal dressing and filling paste in syringe of 2 to 4 gms metapex , base acrylic resin powder pink shade bott of 450 gm and acrylic resin liquid bott of 227 points 3 ml , gutta percha points set of 02 boxes of size 15 40 box of 120 , medicaments rootcanal formacresol bott of 10 to 15ml , medicaments root sod hypo 2 percentage , pluger nerve canal fig 2 set of 6 assorted , points absorbent root canal assorted , endodontic access burs set of 06 , gp solvent bott of 10 ml , orthodontic silver solder spool of 8 to 10 mts , flux for orthodontic solder bottle of 15 gm , endodontic file system for retreatment , chlorhexidine mouthwash 0 point 2 percentage bott of 150 ml , rolls absorbent cotton dental assorted sizes in box of 500 , dental floss , interproximal brush pkt of 6 , unifloss pkt of 100 , novabone putty , periodontal ab plus ldd , vaseline , butane gas , povidone iodine solution 5 percentage bott of 100 ml , gum paint 15 ml , cavity liner calcium hydroxide based self cure radiopaque two paste system tube of not less than , gel for root canal preparation containing water soluble lubricant 15 to 17 percentage edta tube of 3 to 5 gm , clove oil bottle of 50ml , desensitising paste stannous fluoride , autoclavable plastic endo box , dextrose monohydrate for oral use pkt of 100 gm , k file ss 21 mm length 15 no size set of 06 , k file ss 21 mm length 20 no size set of 06 , k file ss 21 mm length 25 no size set of 06 , k file ss 25 mm length 15 no size set of 06 , k file ss 25 mm length 20 no size set of 06 , k file ss 25 mm length 25 no size set of 06 , k file niti 21 mm length 15 to 40 no size set of 06 , k file niti 25 mm length 15 to 40 no size set of 06 //bid details 2 / 35

Central Government/Public Sector

CTN :42790867

08 Dec, 2025 7.53 Lacs

Raipur - Chhattisgarh

Tender For supply of diisopropylamine sigma- 471224 - 100 ml , 2- methoxy ethanol sigma - 284467 - 100 ml , dextran from leuconostoc spp. sigma - 31388 - 25g , indium tin oxide coated glass side -ito sigma- 636908-10pak , neoprene dry-box gloves z170062-1pak , aluminum oxide sigma- 229423-25g , lithium nitrate sigma- 229741-25g , nickel nitrate sigma- 72252-50g , citric acid monohydrate sigma- c1909-500g , phosphate buffered saline sigma - p4417 -50 tab , polyethylene glycol 400 for synthesis 00259 00500 , acetic acid sigma - 695092 -500 ml , sodium acetate sigma - 241245 -100g , sodium hydroxide sigma - 10649800500 - 100g , ethanol ar 99.9 percent loba - 2.5 ltr , bismuth - iii nitrate pentahydrate sigma- 467839 - 50g , aluminumisopropoxide sigma- 220418 - 100g , hydrochloric acid 35.4 percent ar loba -2.5 ltr , teflon lined ss hydrothermal reactor 100 ml , 2-propanol sigma- 190764- 1l , azo ar grade spin coating ink 25ml , ptfe syringe filter 0.2 micrometer , hydriodic acid -hi 57 percent ar 250ml , hbr acid 48 percent extra pure 500ml , cscl 99.999 percent trace metals basis 10g , pbbr2 ar grade 10g , titanium isopropoxide ar grade, 99.99 percent 25ml , titanium isopropoxide srl, 99 percent 500ml , methanol 99.5 percent extra pure 1l , 5ml syringe , nickel nitrate hexahydrate ar grade 20g , l-ascorbic acid 99 percent pure 500g , ethylene glycol 99 percent pure 500ml , rhodamine 95 percent powder 100ml , methylene blue dye content - 82 percent 25g , malachite green solution 100ml , mgcl2 acs reagent 100g , na2s2o3.5h2o acs reagent 25g , teo2 99.9 percent trace metal basis 10g , na2seo3 acs reagent 5g , naoh ar grade 98 percent 500g , zinc acetate ar grade 99 percent 250g , sncl2.2h2o ar grade 99 percent 100g , tx-100 laboratory grade 100ml , 2- methoxyethanol 99.8 percent pure 500ml , kapton tape 12 mm , kapton tape 25 mm , na2so4-238597 ar grade 500g , beaker 100 ml highly thermally stable , beaker 250ml highly thermally stable , beaker 500ml highly thermally stable , vial 10ml highly thermally stable , silver nitrate 209139 - 99 percent pure 25gm , indium tin oxide - coated glass slide size - 25 mm x 25 mm x 1.1 mm surface resistivity - 30-60 ohm per sq - 10 pkg , silver nitrate purity greater than 99 percent, form -powder - 25gm , gallium - iii nitrate hydrate purity greater than 99 percent, form - powder - 25gm , hydrofluoric acid acs reagent, 48 percent - 500ml , pedot - pss poly 3,4- ethylenedioxythiophene - polystyrene sulfonate ar grade - 25gm , polymethyl methacrylate - pmma - purity greater than 99 percent - 25gm , n- dodecyl mercapton -ddt - purity greater than 99 percent - 500ml , thioacetamide purity greater than 99 percent - 100gm , cobalt chloride hexahydrate purity greater than 99 percent - 25gm , tetracycline purity greater than 99 percent - 5gm , pfoa - perfluorooctanoic acid purity greater than 99 percent - 5gm , atrazine purity greater than 99 percent - 5gm , glyphosate purity greater than 99 percent - 5gm , selenium metal powder oxford ar, 99.99 percent - 100gm , ammonium molybdate tetrahydrate acs reagent, 99.98 percent trace metal basis - 50gm , nickel acetate tetrahydrate 98 plus percent - 100gm , ascorbic acid bioxtra, greater than99.0 percent crystalline - 25gm , aquivion - 802557-25 ml borosilicate glass, 25 ml capacity , sample glass vials borosilicate glass, 25 ml capacity , ti3alc2 max phase powder 50gm , hf2pbc max phase powder 25gm , zr2alc max phase //bid details 2 / 53 powder 25gm , ti2alc max phase powder 25gm , lif 50g , tmaoh 250 ml

CTN :42796478

08 Dec, 2025 1.47 Lacs

Ganjam - Odisha

Tender For supply of root canal sealer 02x 04 ml tube of paste 01x mixing pad , abdominal swab pkt of 10 , syringes hypodermic needle size 30 gauge box of 100 , disposable sleeves light cure unit pkt of 200 , gic type 1 for luting 15 gm powder 10 ml liquid , k file no 15 to 40 31 mm , type ii gic for restoration 10 gm powder 7.8 gm liquid and 01 mixing pad , gic type 9 for restoration 01x 15 gm powder 01x6.4 ml liquid and 01x mixing pad , lc compo kit 4x03 gm syr 01x 3.5ml bon agen 01x 3ml condr syre 50x appl tips , light cure flowable composite kit 2x1.8gm syringe and 25x syringe tips , temporary filling material pkt of 40 gm , calcium hydroxide past for rct , cotton rolls for dental pkt of 500 pc , spreader 15 to 40 , gp points f1 , gp points f2 , gp points f3 , gp points f4 , gp points f5 , paper points f1 f2 f3 , paper points 15 to 40 , formocresol liquid , sodium hypochlorite 2 percent of 500ml , calcium hydroxide paste for rc , inj lignocaine 2 percent with adr 1 isto 80000 cart pkt of 50 , surface aneasthetic spray , dental napkin , povidone iodine solution 10 sol bott of 100ml , chlorohexidine mouthwash 0.2 percent bott of 100ml , desensitizing tooth paste tube of 50 gm , prophylaxis paste , gum paint bott of 15 ml , mouth ulcer gel benzocaine tube of 15 gm , nitrile glove size large , nitrile gloves size medium , dispo syringe 10 ml of 50 , alginate impression material , putty impression material , light body impression material pkt of 4 cartridge , bmw bags disposable assorted size , patients bib plastic , glide path rotary files 2 percent 21 mm , glide path rotary files 2 percent 25 mm , protaper next rotary files refil pack x1 x2 25 mm , protaper next rotary files refil pack x1 x2 21 mm , protaper next gp points x1 , protaper next gp points x2 , bio ceramic root canal sealer paste syr of 03 gm , h file no 15 21 mm , h file no 20 21 mm , h file no 25 21 mm , para core core build up kit , impression tray plastic set , shoe cover for dispenser , disposable face mask pkt of 50 //bid details 2 / 44

Ammonium Polysulfide Tenders

By Cities

By States

By Agencies

By Ownerships

By Sectors

State Government

Central Government And Public Sector

Central Government/Public Sector