Hawach Scientific Qualitative Filter Paper

Hawach Scientific product quality is in strict accordance with ISO9001:2000 quality system certification procedures, and from now on we have exported to more than 120 countries.

Compared to quantitative filter paper, qualitative filter paper contains more residue ash, so it can only be used for general qualitative analysis and for filtration precipitation or suspension in solution, but cannot be used for quality analysis. And the low mechanical strength and toughness of filter paper make it not suitable for filtration of heat and concentrated sulfuric acid or nitric acid solution. Qualitative filter papers are widely used for general filtration in the lab. Made of cellulose fiber, they are manufactured from high-quality cotton linters with the treatment of maximizing alpha-cellulose.

Hawach has two kinds of qualitative papers: standard and wet-strengthened papers. with the wrinkled surface, the wet-strengthened quality filter paper which contains a small amount of chemically stabilized resin is very tough. Due to its high wet strength, it is perfect for filtering coarse products or gelatinous precipitates. Based on your applications, you should consider the levels of purity, hardness, flow rate, loading capacity, and chemical resistance when you look for suitable products.

The types and specifications of qualitative filter paper are basically the same as those of quantitative analysis filter paper, which means fast, medium, and slow speeds. Instead, the characters of fast, medium, and slow speeds are printed. However, when the filter paper is not used for quantitative and qualitative analysis on the filter paper box, it should be noted that:

(1) The general use of natural filtration, the use of filter paper, and the ability to trap solid particles, so that the liquid and solid separation;

(2) As a result of the filter paper mechanical strength and toughness are less as far as possible with the method of filtration, such as must accelerate the filtration speed, in order to prevent filter failure, in order to prevent filtering through the air pump filtration, according to the size of the suction in the funnel stack 2 ~ 3 layers of filter paper, in the vacuum filtration, in the leakage. First, pad a layer of dense press cloth, and then put filter paper to filter;

(3) Filter paper had better not filter hot concentrated sulfuric acid or nitric acid solution.

Types of Qualitative Filter Paper

Qualitative filter paper provided by our company is divided into two types, that is, standard qualitative filter papers and wet-strengthened qualitative filter papers. And standard qualitative filter papers contains five grade, they are in turn: BIO-1, BIO-2, BIO-4, BIO-5 and BIO-6, wet-strengthened qualitative filter papers includes BIO-113 and BIO-91. product appearance of all qualitative filter paper is smooth and the ash content (%) are all less than 0.06; wet burst (psi) of all wet strengthened filter paper is equal or greater than 320, an ash content of all wet strengthened filter paper is less than 0.13.

1. Standard Grades Qualitative Filter Paper
BIO-1, Particle Retention 11um, Ash Content 0.1% , 84g/m2
BIO-2, Particle Retention 8um, Ash Content 0.1% , 84g/m2
BIO-4, Particle Retention 20um, Ash Content 0.1% , 84g/m2
BIO-5, Particle Retention 2.5um , Ash Content 0.1%, 84g/m2
BIO-6, Particle Retention 3um , Ash Content 0.1%, 84g/m2

2. Wet Strengthened Grades
These extremely strong filter papers have a high wet strength due to the addition of a small quantity of chemically stable resin.
BIO-91, Separating Property PbSO4, Filtration Seconds 35-70, pore size 10um, Basis Weight 84 g/m2, Ash Content 0.13%.
BIO-113, Separating Property Fe(OH)3, Filtration Seconds 35, pore size 30um, Basis Weight 64 g/m2, Ash Content 0.13%.

Specification of Qualitative Filter Paper

Diameter available: 70/90/110/125/150/180mm.
Sheet: 600×600, 650×650, 800×800, 850×850, 900x900mm.

Performance of Qualitative Filter Paper

Qualitative filter paper provides with good filtering performance and strong absorption property, which is often used as a filter medium to separate the solution from the solid.

Overview of qualitative filter paper, analysis laboratory commonly used filter paper as a filter medium, so that the solution and solid separation. Qualitative filter paper generally has a large amount of residual ash, which is only used for general qualitative analysis and filtration of precipitation or suspended substances in solution, not for quality analysis.

With the highest degree of polymerization, Alpha cellulose is recommended as the most stable cellulose form. Qualitative filter papers made from a high percentage of alpha cellulose guaranteed high quality and consistency. Compared to quantitative filter papers, qualitative papers are more suited for general application.