Advantec MFS Inc.
Mfg Item # : N0611.0CM
Advantec Quantitative Ashless Filter Papers are made from the highest quality alpha cotton cellulose. One critical step in the manufacturing process of these filter papers is acid washing. All grades are double acid washed in hydrochloric then hydrofluoric acid to reduce levels of SiO2, CaO, and Fe2O3. Following the acid wash, all papers are rinsed in ultrapure water to neutralize. Grade No. 4A Hardened is further treated with nitric acid. Following the acid wash, all papers are rinsed in ultrapure water to neutralize. Ash Content: 0.01% (except Grade No. 4A is 0.025%). Grade No. 3 Medium retention, fast flow rate paper with good chemical resistance and wet strength. Recommended for analysis of soils, fertilizers, cement, and minerals. Nominal Retention: 5 µm. Grade No. 5A Retains coarse and gelatinous ppt with high flow rates. Filter hydroxides, metalic aerosols, environmetnal monitoring, and determine silica content in steel. Nominal Retention: 7 µm. Grade No. 5B Retains medium size ppt such as CaCo3, PbSO4, AgCl. General purpose paper. Nominal Retention: 4 µm. Grade No. 5C High retention efficiency collecting fine ppt such as BaSO4 with slow flow rate. Gravimetric analysis and collecting particles that tend toward colloidal dispersion. Nominal Retention: 1 µm. Grade No. 6 Retains medium-fine particulates. Use for precision analysis of trace and precious metals, beverages, water. Nominal Retention: 3 µm. Grade No. 7 Highest purity paper for medium particulates. Fast flow rate. Recommended for precise gravimetric analysis of minute trace and precious metals. Nominal Retention: 4 µm. Grade No. 4A Hardened, smooth low ash paper with superior wet strength. Retains fine crystalline ppt with slow flow rate. Suitable for Buchner filtrations, high pressure, high chemical and pH resistance. Nominal Retention: 1 µm. Please Note: ALL Advantec items have a maximum 48 hour cancellation window. Any cancellations AFTER the 48 hour window will incur a restocking fee equal to the cost of the product.

and Stopper

ParkerBalston 9955-12-371H

VWR International 28306-346
VWR* Grade 474 Filter Paper 9cm VWR* Grade 474 Filter Paper, Quantitative, Diameter: 9.0 cm, particle retention: 5-10um, Uses include filtration of aluminum phosphate, zinc ammonium phosphate and silver chromate. For general quantitative analyses, Medium fine porosity and flow rate

VWR International 28310-128
VWR* Grade 413 Filter Paper, Qualitative 15.0cm diameter. For routine lab work. Suitable for student requirements in general chemistry. Suitable for filtration of aluminum phosphate, barium carbonate, lead chromate, and more. Medium porosity. Medium flow rate. 5um particle retention.

VWR International 28313-057
VWR* Grade 417 Filter Paper, Qualitative, Crepe 9.0cm diameter. Good for rapid filtrations where fine particle retention is not required. Coarse porosity. Fast flow rate. 40um particle retention.

VWR International 28321-135
VWR* Grade 410 Filter Paper, Qualitative 15.0cm diameter. Useful in analytical operations involving filtration of cuprous oxide, lead sulfate, barium sulfate, manganese carbonate, and more. Fine porosity. Slow flow rate. 1um particle retention.

Cytiva - Whatman 1541-070 Grade 541 Quantitative Filter Paper, Ashless
7.0cm diameter. Hardened. For fast filtration of gelatinous precipitates and coarse particles from alkaline/acid solutions during gravimetric analysis. High wet-strength, high purity. Coarse porosity. Fast flow rate. 20-25um particle retention. Exact Match 28479-027

Cytiva - Whatman 1827-125 Glass Microfiber Filter Binder Free 125mm
Glass Microfiber Filter Binder Free, Type:circle, Dimensions: 125 mm, Grade: 934-AH, AirFlow rate: 3.7 s/100 ml/in2, Basis Weight: 64 g/m2, Filtration speed: Fast, Load Capacity : High loading, Particle retention: 1.5 um, Typical Thickness: 435 um Exact Match 28496-966

Cytiva - Whatman 1001-240 Grade 1 Filter Paper
24.0cm diameter. For a wide range of laboratory applications, liquid clarification, gas filtration, air pollution analysis, and soil analysis. Medium porosity. Medium flow rate. 11um particle retention. Exact Match 28450-182