FILTRATION
178
90 mm Microfiltration
90 mm ULTRA-WARE® Microfiltration Assembly with SS Support and Ground Joint The 90 mm filtration apparatus with stainless steel support is recommended when filtering large volumes of viscous or proteinaceous solutions to give the maximum flow rate. • This unit is also used to produce ultra clean filtrate since the screen will not shed particles into the filtrate • Each apparatus is supplied with stainless steel support screen, glass support base, 1000 mL funnel, anodized aluminum clamp and filtration flask • 80 x 80 304 stainless steel mesh, 0.0055” opening size, 19.4% open area, 0.007” wire diameter • Manufactured from 33 expansion, low extractable borosilicate glass conforming to USP Type I and ASTM E438, Type I, Class A requirements
Funnel Capacity (mL)
Part Number
Flask Capacity (mL) Case Qty
953855-1090
1000
1000
1
Replacement Parts
Part Number 953753-0090
Description
Case Qty
90 mm Anodized Aluminum Clamp
1
Stainless Steel Support Screen for 90 mm Filtration Assembly, 80 x 80 mesh, 304 stainless steel, 0.0095” opening size, 19.4% open area, 0.007” wire diameter
953810-0090
1
953827-0000 953841-0090 953781-0090
1000 mL Flask, 40/35 inner joint 90 mm, 40/35 Glass Base 1000 mL Glass Funnel, 90 mm
1 1 1
Accessories
Part Number 953830-0000
Description
Case Qty
40/35 Glass Cap
1
PTFE Sleeves for Greaseless Connections, Fits Standard Taper Joint 40/35
676001-4035
6
Recommended Procedures for Maximum Filter Life of Fritted Ware
Precipitate
Removal Agent
Albumen Hot ammonia or hydrochloric acid. Aluminous and siliceous residues 2% hydrofluoric acid followed by
New Filters - Wash new filters using suction with hot hydrochloric acid solution, followed by a water rinse.
concentrated sulfuric acid. Rinse immediately with water until no trace of acid can be detected.
Pressure Limits - The maximum safe differential pressure on a disc is 15 pounds per square inch.
Copper or iron oxides
Hot hydrochloric acid plus potassium chlorate.
Thermal Shock - Fritted ware has less resistance to thermal shock than non-porous glassware, hence excessive rapid temperature changes and direct exposure to a flame should be avoided. Heating in a furnace to 500 °C may be done safely, provided the heating and cooling are gradual. Dry ware may be put into a furnace that is set at 150 °C, but attainment of a constant weight is usually done at 105°-110 °C. Cleaning of Used Filters In many cases, precipitates can be removed by rinsing with water from the underside, with the pressure not exceeding 15 pounds per square inch. The suggestions that follow will be helpful in dealing with material that cannot be removed by the reverse water-wash. The use of strong alkalies, strong hydrofluoric acid and phosphoric acid should be avoided. Also, mechanical scratching of the surfaces will weaken the discs.
Glucose
Hot mixed sulfuric acid and nitric acid.
Fatty materials
Carbon tetrachloride
Mercuric sulfide
Hot agua regia (concentrated nitric acid and hydrochloric acid)
Mercury
Hot nitric acid
Organic Matter
Hot concentrated cleaning solution, or hot concentrated sulfuric acid with a few drops of sodium nitrite. (Bichromate cleaning solutions tend to permanently strain fritted ware which is undesirable for biochemical or pharmaceutical work.)
Silver chloride
Ammonium or sodium hyposulfite.
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