กระดาษกรอง whatman เบอร์ 44

• การวัดมวลแห้งที่ปราศจากขี้เถ้าอย่างแม่นยำ
• อัตราการรักษาอนุภาคละเอียดเล็กน้อยที่ 3 µm
• ความเร็วในการกรอง (Herzberg 995 s)
• ความหนาทั่วไป 180 µm

Cytiva's Whatman Grade 44 quantitative paper is a thin version of Grade 42 ashless paper. The thinness reduces the overall ash content, making Grade 44 well suited for analyses relying on ash-free dry weight.

Gravimetric analysis can be time-consuming when filtration of fine particles is required. Because of its reduced thickness, Grade 44 ashless filter paper from Cytiva provides faster filtration of fine particles when compared with thicker papers of similar retention rating, such as Whatman Grade 42 paper.

Parameter	Grade 44 Ashless Filter Paper
Grade	Grade 44
Format	Circles
Type	Ashless
Typical Particle Retention in Liquid1	3 µm
Nominal thickness	176 µm
Typical water flow rate2	11 ml/min
Nominal basis weight	80 g/m²
Nominal air flow rate	56 s/100 mL/in²
Nominal Ash Content3	0.007%
Material	High-quality cotton linters
Alpha Cellulose Content Min.	≥98%
Typical Trace Element Levels	Aluminium 2.5 µg/g Antimony <0.5 µg/g Arsenic <0.5 µg/g Barium <0.5 µg/g Boron <1 µg/g Calcium 8.3 µg/g Chromium 1.5 µg/g Copper 2 µg/g Iron 12 µg/g Lead <0.5 µg/g Magnesium 4 µg/g Manganese <0.5 µg/g Mercury <0.5 µg/g Potassium 2.3 µg/g Silicon 6.2 µg/g Sodium 16.8 µg/g Zinc 64.5 µg/g
Application	Designed for gravimetric analysis and the preparation of samples for instrumental analysis.