Latest glass stopper Tenders | Government glass stopper Tenders

CTN :44948846

03 Jun, 2026 3.00 Lacs

Chennai - Tamil Nadu

Tender For bid to ras supply of glassware for ral chennai d d - beaker 250 ml tall form with spout , beaker 400ml tall form with spout , burette plain 50ml with a cerificate 0.1 ml graduation with glass stopper , burette 50 ml automatic zero amber colour mounted on reservoir with glass stop clock class a , silica crucibles medium form 50 ml without lid should with stand the temperature up to 600 degree celsius in muffle furnace , cylinder graduated 50ml 1ml graduation with single metric scale and tall form with spouted neck pour out type 1b class a , dean and stark apparatus full set for the determination of moisture round bottom flask 500 ml capacity with b24 trap joint 5 ml trap without stop cock , flask std. volumetric 1000 ml with interchangeable stopper white class a certified , flask std. volumetric 100 ml with interchangeable stopper white class a certified , flask conical 250 nm plain with b24 joint and stopper , flask 310 ml capacity without joint plain neck rm pv flask , flask sugar with 110 by 100ml marking two mark , flask round bottom 1000ml capacity with b24 joint , alcohol or water re distillation assembly flat bottom flask 2000 ml with side arm having 24 by 29 interchangeable joint , glass beads 3mm dia , iodine flask interchangeable stopper 500ml , separating funnel 1000ml capacity pear shaped interchangeable stopper glass bore stop cock , one mark pipettes 100 ml with bulb class a , one mark pipettes 50ml with bulb class a , one mark pipettes 20 ml with bulb class a , one mark pipettes 25 ml with bulb class a , moisture dishes 7 to 8 cm in diameter 2.5 cm deep provided with tight fitting slip over cover , centrifuge tubes , air condenser , pipette 5 ml , pipette 2 ml , flasks kjeldahl round bottom long neck ) /bid number : gem/2026/b/7456139 * /dated: 20-04-2026 & & / bid document 1 / 21

CTN :45255745

01 Jun, 2026 NA

Bikaner - Rajasthan

Tender For bid to ras supply of chain and sprocket kit , side stand assy , slave cyl clutch , part kit brake chamber , spigot bearing , zf gear box gasket kit , assy clutch disc 330 dia , drive assy , glass assembly wind screen , flip seal windscreen glass , stopper windshield glass , glass sealant

State Government

CTN :45344446

10 Jun, 2026 10.00 Lacs

Udaipur - Rajasthan

Tender For rate contract for chemicals and kits itmes for 02 years - rate contract for chemicals and kits items for 02 years, absolute alcohol (rate per 500 ml), acetone(rate per 2.5 ltr.), acid(toilet cleaner)(rate per 1 ltr.), dpx mountant for microscopy(rate per 250 ml), eosin alcohol soluble(rate per 25 gm), eosin water soluble(rate per 25 gm), formaldehyde solution for synthesis(rate per 5 ltr. pack), formaldehyde solution for synthesis(rate per 30 ltr. pack), glycerol (rate per 2.5 ltr. pack), hemotoxyline stain powder (rate per 25 gm), napthalin ball (rate per 12 kg), paraffin wax (rate per 500 gm), phenol for synthesis assay (rate per 500 gm), potassium hydroxide [koh] (rate per 500 gm), sprit rectified (rate per 1ltr.), thymol crystal(rate per 1kg), toluene gr(rate per 2.5 lit), turpentine oil(rate per 500 ml), xylene gpr(rate per 2 kg), plasticine(rate per 500 gm), beaker 500ml(rate per 1 pieces), beaker 1000ml(rate per 1 pieces), beaker 2000ml(rate per 1 pieces), coverslip (microcover glass) 1 packet 10 gm each(rate per 1 packets), coverslip (microcover glass) 1 packet 10 gm each(rate per 1 packets), funnel glass with long stem conical shape size 10 cm (rate per 1 packet), funnel glass with long stem conical shape size 15 cm (rate per 1 packet), funnel glass with long stem conical shape size 75 cm (rate per 1 packet), measuring cylinder graduated, 25ml (rate per 1 pieces), measuring cylinder graduated, 2000ml (rate per 1 pieces), microslides (1 packet of 50 slides each) (rate per 1 packet), rectangular jar with lid (lid thickness not more than 3mm) for museum specimen mounting cjars of different sizes. (rate per 1 jar), reagent bottle wide mouth with ground & dust proof stopper, 250ml (rate per 1 pieces), reagent bottle wide mouth with ground & dust proof stopper, 125ml (rate per 1 pieces), reagent bottle wide mouth with ground & dust proof stopper, 5000ml (rate per 1 pieces), bed sheets ( blue and white ) (rate per 1 pieces), blade b.p. knife, 22,23 no. (rate per 1 pieces), buckets plastic with lid,100 ltrs (rate per 1 pieces), buckets plastic with lid, 70 ltrs, (rate per 1 pieces), buckets plastic with lid, 30ltrs. (rate per 1 pieces), buckets plastic with lid, 20ltrs (rate per 1 pieces), buckets plastic with lid, 10ltrs. (rate per 1 pieces), cotton bundle (hospital use ) (rate per 500 gm), latex surgeon s gloves (non sterile ) size 6.5 (rate per 1 box), latex surgeon s gloves (non sterile ) size 7 (rate per 1box), latex surgeon s gloves (non sterile ) size 7.5 (rate per 1box), micropore adhesive tape 4 inch (rate per 1 pieces), micropore adhesive tape 2 inch (rate per 1 pieces), soap (hand wash ) (rate per 1 pieces), bed sheet(blue & white) (rate per 1 pieces), latex surgons gloves(6.5) (rate per 1 box), cotton bundle (rate per 1 roll), latex surgons gloves(7) (rate per 1 box), micropore adhesieve tape(2 inch) (rate per 1 box), liquid soap handwash 200ml (rate per 1 bottle), benedict s solution(5ltr) (rate per 5 lit), egg albumin powder(500 gm) (rate per 500gm), wbc diluting fluid (rate per 500 ml), sodium nitroprusside(100gm) (rate per 100gm), ammonium sulphate powder (rate per 500gm), micro glass slide(75x25x1.25mm) (rate per 100 slide), cover-slip(50x22mm) (rate per 100 slip), cover-slip(18x18mm)(rate per 100 slip), xylen gpr ( sulphur free) ( rate per 2.5 ltr.), aceton (synthesis) (rate per 2.5 ltr.), methanol(rate per 2.5 ltr.), dextrose powder (500 gm) (rate per 500gm), liquid ammonium solution( rate per 2.5 ltr.), hb string rod 2 mm (rate per 2 mm rod), plastic droper 2ml (rate per 2 ml ), plastic droper 1 ml (rate per 1 ml), glycerol (1 ltr.) (rate per 1 ltr.), staining reagent rake size (18 x18 x6 ) in 2 shelf each shelf having 6 hole) ole size 3 diameter (rate per), giemsa stain (500ml) (rate per 500ml), sprit (500ml) (rate per 500ml), bottel for reagent(100ml) (rate per 100ml), bottle for reagent merrow glass stopper colour brown (100ml)(rate per 100ml), urinometer (rate per 1), phenyl(5 ltr.) (ra

Central Government And Public Sector

CTN :45002700

23 May, 2026 NA

Chittorgarh - Rajasthan

Tender For corrigendum : tender for supply of pyrolyser spares - quartz worktube (standard spigot and cone joint) work tube for pyrolyser (make raddec , model pyrolyser 6trio serial no f4696-2022) with glass end caps b29 (sockets) part no 300012 and 300002 , ptfe clip for cone / socket 29/32 clips for end caps part no 400002 for pyrolyser (make raddec , model pyrolyser 6trio serial no f4696-2022) , quartz glass boats deep sample boat part no 300007 for pyrolyser (make raddec , model pyrolyser 6trio serial no f4696-2022) , standard bubbler combined bubbler for trapping co2 , part no 300003/4 for pyrolyser (make raddec , model pyrolyser 6trio serial no f4696-2022) , rodavis complete trap , rodavis trap (standard ns29 connection with straight up spigot) for water trapping in cryocooler , part no 300015 for pyrolyser (make raddec , model pyrolyser 6trio serial no f4696-2022) , 0.3percentage pt-alumina catalyst pellets 1kg , 0.3percentage pt-alumina catalyst , part no 420003 for pyrolyser (make raddec , model pyrolyser 6trio serial no f4696-2022) , poly-urethane tubing , poly-urethane tubing 8mm (clear) of 1 m length , part no 220012 for pyrolyser (make raddec , model pyrolyser 6trio serial no f4696-2022) , silicone tubing , tubing (silicone) 6 mm bore 1.75 mm wall thickness (1 m length) part no 410001 for pyrolyser (make raddec , model pyrolyser 6trio serial no f4696-2022) , silica wool in 10gm pack for pyrolyser (make raddec , model pyrolyser 6trio serial no f4696-2022)

CTN :45197809

29 May, 2026 NA

Delhi - Delhi

Tender For supply of condenser, with dirp tip, approx. jacket length 300mm , borosilicate erlenmeyer conical flask, 19by26 50ml , borosilicate erlenmeyer conical flask, 19by26 100ml , borosilicate erlenmeyer conical flask, 24 by 29 250ml , borosilicate erlenmeyer conical flask, 24by29 500ml , borosilicate cylinders class a, 10 by 19, 10ml , borosilicate cylinders class a, 5ml , borosilicate cylinders class a, 50ml , borosilicate cylinders class a, 25ml , borosilicate cylinders class a, 10ml , cylinders class a, 5ml , cylinders class a, 500ml , cylinders class a, 2000ml , cylinders class a, 25ml , cylinders class a, 1000ml , cylinders class a, 100ml , nessler cylinders, 25ml , nessler cylinders, 50ml , borosilicate vacuum desiccator set, 150mm , borosilicate vacuum desiccator set, 200mm , borosilicate crystallizing dishes, 1150ml , borosilicate petri dishes 3 point 3 borosilicate, 100x17mm , drying trays 320x180x50mm, 1500ml , flat bottom evaporating dishes 105x55mm, 290ml , petri dishes 3 point 3 borosilicate, 50x17mm , petri dishes 3 point 3 borosilicate, with lid 80x17mm , borosilicate dean stark distilling apparatus, 10ml , all glass filtration assembly, 1000ml , glass filtration assembly, 47mm, 300ml, 1000ml , borosilicate filter flask 250ml , borosilicate filter flask 500ml , forceps pointed, forceps, 5 inches , forceps pointed, forceps, 4 inches , ss filter funnel with reciever flask 1 ltr, 1000ml , borosilicate buchner funnel with sintered disc, 80ml, porosity grade 1 , borosilicate buchner funnel with sintered disc, 80ml, porosity grade 2 , borosilicate glass filter funnel, 50mm , borosilicate powder funnel, 24 by 29, 150ml , borosilicate pressure equilising cylindrical funnel, 19 by 26, 50ml , borosilicate pressure equilising cylindrical funnel, 19 by 26, 100ml , borosilicate separating funnel, 19 by 26, 125ml , borosilicate round bottom flask, 24 by 29, 500ml , borosilicate round bottom flask, 24 by 29, 100ml , borosilicate round bottom flask, 24 by 29 50ml , borosilicate round bottom flask 19 by 26, 25ml , borosilicate round bottom flask 14by23, 10ml , borosilicate round bottom flask 14by23, 5ml , borosilicate round bottom flask 24by29 500ml , borosilicate round bottom flask 19by26, 250ml , borosilicate round bottom flask 24by29, 250ml , borosilicate round bottom flask 2 necks, 24by29, 250ml , borosilicate round bottom flask 3 necks, 24by29, 500ml , retort base retort base, 10inche x 6inche , retort ring retort ring with bosshead, 3inch , rod for retort base retort rod 12x600mm , glass stirrer rod, 9x255mm , rubber septa b-14by19 , rubber septa b-19by24 joint , rubber septa b-24by40 joint , cover glass, 22x22mm, 50bypk , cover glass, 24x24mm, 50bypk , microscope glass slides, plain, 76x26x1mm, 25bypk , microscope glass slides, plain, 76x26x1mm, 25bypk , spatulas, 4 inch , spatulas micro scoop, 6inch , oval magnetic stirrer bar, rare earth magnet, 5x10mm , oval magnetic stirrer bar, rare earth magnet, 6x15mm , oval magnetic stirrer bar, rare earth magnet, 12x25mm , oval magnetic stirrer bar, rare earth magnet, 15x32mm , oval magnetic stirrer bar, rare earth magnet, 15x34mm , oval magnetic stirrer bar, rare earth magnet, 20x50mm , polygon magnetic stirrer bar 6x10mm , borosilicate adaptor bent cone with stopcock, 24by29, 2mm , borosilicate adaptor bent cone with stopcock, 19by26, 2mm , borosilicate adaptor straight cone with stopcock, //bid details 2 / 96 24by29, 2mm , borosilicate adaptor straight cone with stopcock, 19by26, 2mm , borosilicate glass stoppers isobydin, 19by26 , borosilicate glass stoppers isobydin, 14by23 , borosilicate glass stoppers isobydin, 24by29 , tongs for beakers and flasks, 12inch , culture tube flat bottom, with pp cap, 5ml 100bypk , culture tube flat bottom, with pp cap, 10ml 100bypk , graduated test tube with ibyc glass stopper, 15ml, 14by23 , test tubes without rim, 15x150mm , 9mm screw top amber vials made from borosilicate usp type 154 100bypk, 2ml , 9mm screw top clear vials made from borosilicat

State Government

CTN :45148120

01 Jun, 2026 NA

Aizawl - Mizoram

Tender For supply of: clevenger apparatus, conical flask with vacuum inlet, buchner funnel (porcelain made), rubber guard for buchner funnel, volumetric flask, glass funnel, heating mantle for 500 ml single-neck rb, borosil funnel with short wide stem, borosil plain funnel 60 angle short stem, filtering flask, borosil buchner funnel with sintered disc, conical flask, borosil test tubes, jsw test tubes, glass stoppers, separating funnel with ptfe key stopcock, pear-shaped rotary flask 29/32, enlarging connecting adapters, lab cold finger condenser, 25 square mm 3-core copper wire.| quantity - 514

State Government

CTN :44944350

27 Apr, 2026 4.20 Lacs

West Tripura - Tripura

Tender For strengthening of state level water testing laboratory, pwd(dws) / supply of laboratory glassware for state level water testing laboratory, pwd (dws) under wqmsp activities of jjm during the year 2025-26 - supply of following laboratory glassware (borosil/duran/pyrex make) as per direction of engineer-in-charge., supply of conical flask with narrow mouth, with rim, made from heat resistant, low expansion borosilicate glass, with isi mark (100ml = 1 unit), supply of conical flask with narrow mouth, with rim, made from heat resistant, low expansion borosilicate glass, with isi mark (250 ml = 1 unit), supply of conical flask with narrow mouth, with rim, made from heat resistant, low expansion borosilicate glass, with isi mark (500 ml = 1 unit), supply of conical flask with narrow mouth, with rim, made from heat resistant, low expansion borosilicate glass, with isi mark (1000 ml = 1 unit), supply of low form beaker with spout, graduated with isi mark (100 ml = 1 unit), supply of low form beaker with spout, graduated with isi mark (250 ml = 1 unit), supply of low form beaker with spout, graduated with isi mark (500 ml = 1 unit), supply of low form beaker with spout, graduated with isi mark (1000 ml = 1 unit), supply of low form beaker with spout, graduated with isi mark (5000 ml = 1 unit), supply of pipettes, class-a, with individual calibration certificates, graduated from zero mark. (1 ml = 1 unit), supply of pipettes, class-a, with individual calibration certificates, graduated from zero mark. (2 ml = 1 unit), supply of pipettes, class-a, with individual calibration certificates, graduated from zero mark. (5 ml = 1 unit), supply of pipettes, class-a, with individual calibration certificates, graduated from zero mark. (10 ml = 1 unit), supply of reagent bottle narrow mouth with i/c glass stopper, with solid glass stopper, graduated, strong and chemical resistant. (250 ml = 1 unit), supply of reagent bottle narrow mouth with i/c glass stopper, with solid glass stopper, graduated, strong and chemical resistant. (500 ml = 1 unit), supply of reagent bottle narrow mouth with i/c glass stopper (amber), with solid glass stopper, graduated, strong and chemical resistant. (500 ml = 1 unit), supply of volummetric flask, class a, with isi mark, narrow mouth, clear, with individual calibration certificate (50 ml = 1 unit), supply of volummetric flask, class a, with isi mark, narrow mouth, clear, with individual calibration certificate (100 ml = 1 unit), supply of volummetric flask, class a, with isi mark, narrow mouth, clear, with individual calibration certificate (250 ml = 1 unit), supply of volummetric flask, class a, with isi mark, narrow mouth, clear, with individual calibration certificate (500 ml = 1 unit), supply of volummetric flask, class a, with isi mark, narrow mouth, clear, with individual calibration certificate (1000 ml = 1 unit), supply of measuring cylinder graduated, class a, hexagonal base, pour out, with individual calibration certificate(50 ml = 1 unit), supply of measuring cylinder graduated, class a, hexagonal base, pour out, with individual calibration certificate(100 ml = 1 unit), supply of measuring cylinder graduated, class a, hexagonal base, pour out, with individual calibration certificate(250 ml = 1 unit), supply of measuring cylinder graduated, class a, hexagonal base, pour out, with individual calibration certificate(1000 ml = 1 unit), supply of glass filter funnel (50 mm diameter)(50 mm diameter = 1unit), supply of glass filter funnel (75 mm diameter)(75 mm diameter = 1unit), supply of glass filter funnel (100 mm diameter)(100 mm diameter = 1unit), supply of test tube (with rim) (27 ml capacity)(27 ml = 1 unit), supply of durham test tube (1 ml capacity) for durham fermentation(1 ml = 1 unit), supply of disposable (single use) polystyrene petri dish for general microbiological use. 90 x 14 mm (dish capacity: ~150 ml)(480 nos = 1 packet = 1 unit), supply of glass filtration assembly, filter support base:47 mm,

Central Government/Public Sector

CTN :44781662

21 Apr, 2026 NA

Ernakulam - Kerala

Tender For supply of glasswares e e - tall form beaker with spout , 10ml measuring cylinder , 1000ml standard flask , 100ml standard flask , 25ml standard flask , 10ml standard flask , glass filter funnel short stem , erlenmeyer conical flask, narrow mouth, with rim , bod bottles complies with is 9213 , nessler cylinder 50ml , burettes with ptfe stopcock , burettes with glass stopcock , mohr pipettes 2ml capacity , mohr pipettes 10ml capacity , volumetric bulb pipette , 125ml capacity bottles , autotilt measure with interchangeable joints , auto tilt measure with interchangeable joints without reservoir 5ml , receiver for dean and stark apparatus , test tube with rim , 2000ml standard flask , 500ml standard flask , 50ml standard flask , 25ml measuring cylinder , 25ml measuring cylinder with i c stopper , 50ml measuring cylinder with i c stopper , 50ml measuring cylinder , 100ml measuring cylinder , 1000ml measuring cylinder , iodine flask with i c glass stopper , mohr pipettes 5ml capacity , auto tilt measure without reservoir 1ml , gooch crucible low form

State Government

CTN :44785258

21 Apr, 2026 3.33 Lacs

Ernakulam - Kerala

Tender For glasswares - tall form beaker with spout; 100ml capacity, 50*80mm (od*length) , tall form beaker with spout; 150ml capacity, 54*95mm (od*length), , tall form beaker with spout; 250ml capacity, 60*120mm(od*length), , 10ml measuring cylinder; class b, hexagonal base, pour out with graduation interval of 0.20ml, , 1000ml standard flask: class a. narrow mouth. clear, with individual, , calibration certificate, , 100ml standard flask ; class a, narrow mouth, clear, with individual calibration certificate, , 25ml standard flask; class a, narrow mouth, clear, with individual, , calibration certificate, , 10ml standard flask; class a, narrow mouth, clear, with individual, , calibration certificate, , glass filter funnel short stem; diameter75mm, 8*75mm (od*length), , glass filter funnel short stem; diameter100mm, 10*100mm (od*length), , erlenmeyer (conical) flask, narrow mouth, with rim; 150ml capacity, 72*124mm(od*length), , erlenmeyer (conical) flask, narrow mouth, with rim; 250ml capacity, 85*145mm(od*length), , erlenmeyer (conical) flask, narrow mouth, with rim; 500ml capacity, 105*180mm(od*length), , bod bottles complies with is 9213; 300ml capacity, 70*143mm (od*length), , nessler cylinder 50ml; capacity 25*150mm(od*length), , burettes with ptfe stopcock; 50ml capacity, graduation interval of 0.10ml, class a with individual calibration certificate, , burettes with glass stopcock; 25ml capacity, graduation interval of 0.10ml, class a with individual calibration certificate, , burettes with glass stopcock; 10ml capacity, graduation interval of 0.05ml,, , class a with individual calibration certificate, , mohr pipettes 2ml capacity; graduation interval of 0.10ml, class a with, , individual calibration certificate, , mohr pipettes 10ml capacity; graduation interval of 0.10ml, class a with, , individual calibration certificate, , volumetric (bulb) pipette; 1ml capacity, class a with individual calibration certificate, tolerance ± 0.006ml, , volumetric (bulb) pipette; 2ml capacity, class a with individual calibration, , certificate, tolerance ± 0.006ml, , volumetric (bulb) pipette; 10ml capacity, class a with individual calibration certificate, tolerance ± 0.02ml, , volumetric (bulb) pipette; 20ml capacity, class a with individual calibration certificate, tolerance ± 0.03ml, , volumetric (bulb) pipette; 25ml capacity, class a with individual calibration certificate, tolerance ± 0.03ml, , 125ml capacity bottles; 56*120mm (od*length) with neck stopper size 19/26, , autotilt measurewithinterchangeable joints w/o reservoir2ml;b24, auto tilt measure with interchangeable joints without reservoir 5ml, b24, , receiver for dean and stark apparatus; without stop cock with 10ml capacity, ground joint 24, socket 19, graduation interval of 0.10ml, , test tube with rim; 55ml capacity, 25*150mm(od*length), , 2000ml standard flask; class a, narrow mouth, clear, with individual calibration certificate, , 500ml standard flask; class a, narrow mouth, clear, with individual calibration certificate, , 50ml standard flask; class a, narrow mouth, clear, with individual calibration certificate, , 25ml measuring cylinder; class b, hexagonal base, pour out with graduation interval of 0.50ml, , 25ml measuring cylinder with i/c stopper; class b, hexagonal base, graduation interval of 0.50ml with stopper size 14/23, , 50ml measuring cylinder with i/c stopper; class b, hexagonal base, graduation interval of 1.0ml with stopper size 14/23, , 50ml measuring cylinder; class b, hexagonal base, pour out with graduation interval of 1.0ml, , 100ml measuring cylinder; class b, hexagonal base, pour out with graduation interval of 1.0ml, , 1000ml measuring cylinder; class b, hexagonal base, pour out with graduation interval of 10ml, , lodine flask with i/c glass stopper; 500ml capacity, interchangeable joint size 24/29, , mohr pipettes 5ml capacity; graduation interval of 0.10ml, class a with individual calibration certificate, , volumetric (bulb) pipette; 5ml capacity, clas

Central Government/Public Sector

CTN :44327653

06 Apr, 2026 NA

Amber - Rajasthan

Tender For corrigendum : supply of glass syringe 5ml , heating mantle, 500ml , separating funnel 250 ml , heating mantle, 2000ml , heating mantle, 1000ml , whatman filter paper grade 1 , burettes with straight bore ptfe key stopcock, capacity= 25ml, graduation interval= 0. 05 , test tubes, test (culture) , without rim (capacity ml= 25 ml, approx o. d. x length mm= 18x150mm) , filtration conical flask - buchner 500 ml , separating funnel pear shaped with stopcock and interchangeable stopper, 250 ml , separating funnel, globe shape, with stopcock and inter- changeable stopper, 1000 ml , glass syringe 10ml , volumetric flask with interchangeable solid glass stopper, accuracy as per class a, amber with certi , variable volume pipette (micropipette) , 200-1000? l model (t-1000) 1 ml , whatmann filter paper 41 , glass syringe 2 microlitre , glass petridish 200 mm(dia) , soxhlet extractor, capacity ml= 1000 ml, extractor socket= 55/44 extractor cone= 34/35 , test tubes, culture, media, round bottom, with pp screw cap (autoclavable) and liner, capacity 15 ml , measuring cylinders, capacity 250 ml , measuring cylinders, capacity 1000 ml , centrifuge tubes, oil, (watering) as per astm d96 o. d= 44 mm length= 165 mm , whatmann filter paper ashless -40 , whatman filter paper grade 42 (qualitative circles diameter 110 mm) , micropipette 100-1000 micro liter , funnel filtering, 60 degree angle , thermometer for pour point ip1c astm 5c with nabl certificate range= -38 to 50? , merck 0. 45? m membrane micron filter paper , whatman filter paper grade 50

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