توضیحات محصول
WHATMAN
Filter Paper : Ashless
Grade : ۴۰
Cat No. : 1440
کاغذ صافی واتمن نمره ۴۰
Whatman No.40
تماس بگیرید
بسته 100 عددی ،
قطر 55 الی 150 میلیمتر ،
موجود در دو ورژن جدید و قدیم ،
محصول شرکت واتمن ،
ضمانت اصالت محصول .
Grade 40 Quantitative Filter Paper Ashless (Ash 0.007%), circle
The classic general-purpose ashless filter paper with medium speed and retention.
Ashless: 0.007% ash maximum for Grades 40 to 44 and a maximum of 0.01% for the 589 Grades. These are very pure filters suitable for a wide range of critical analytical filtration procedures.
Whatman quantitative filters from GE Healthcare are designed for gravimetric analysis and the preparation of samples for instrumental analysis. They are available in three formats designed to meet specific needs.
Grade 40: 8 um
Typical applications for the Grade 40 filter include: gravimetric analysis for numerous components in cements, clays, iron, and steel products; as a primary filter for separating solid matter from aqueous extracts in general soil analysis; quantitative determination of sediments in milk; and as a pure analytical grade clean-up filter for solutions prior to atomic absorption (AA) spectrometry. Also used as a high-purity filter in the collection of trace elements and radionuclides from the atmosphere.
Product properties
| Complete Pack |
100 Pieces
|
| Grade |
Grade 40
|
| Format |
Circles |
| Type |
Ashless
|
| Typical Thickness |
210 µm
|
| Basis Weight |
95 g/m2
|
| Filtration Speed (Herzberg) |
340 s |
| Air Flow Rate |
19.3 s/100 mL/in2
|
| Ash Content |
0.007%
|
| Material |
High-quality cotton linters
|
| Alpha Cellulose Content Min. |
0.98%
|
| Tensile M/D Dry |
46.7 N/15 mm
|
1)This data shown may be based on historic Whatman records. We are in the process of updating our supporting information as the manufacturing site for these products is changing or have changed already. We will update with new data as soon as it is available (expected to be completed by Jan. 2016). As is normal practice, customers should determine and validate for themselves (as necessary) that the products are suitable for their specific application. 2)Ash is determined by ignition of the cellulose filter at 900°C in air.
