A Brief Analysis Of Filter Paper
Hawach has both qualitative filter paper and quantitative filter paper: The difference between quantitative filter paper and qualitative filter paper is mainly the impurity content. Qualitative filter paper is used for qualitative chemical analysis and corresponding filtration separation; quantitative filter paper is for quantitative chemical analysis in gravimetric analysis tests and corresponding analytical tests.
Qualitative filter paper
Standard grade and wet strength grade: The reinforced qualitative filter paper is added a small amount of chemical stabilizer to increase the bursting resistance of the filter paper. However, because the stabilizer contains nitrogen, the qualitative filter paper is not recommended for the Kay nitrogen test, which is a method for determining the amount of total nitrogen in a compound or mixture.
Quantitative filter paper
Ashless grade, hardened low ash grade, hardened ashless grade: The essential difference is the impurity content and hardness.
Hardened low ash grade and hardened ashless grade mean the surface acid pickling on the basis of quantitative filter paper to increase the surface bursting strength of filter paper. After use and sample filtration, it is necessary to scrape the retentate for quantitative analysis. The ashless grade has a lower ash content than the low ash grade.
Filter paper material
The filter paper can be made of natural fiber, chemical fiber, and glass fiber. The natural fiber includes softwood pulp, hardwood pulp, and beech grass pulp; filter papers generally use the mixed pulp and add a little cotton pulp.
Filter paper performance
Fluffy: being fluffy to the breathable, density of 0.15 ~ 0.35g / cm3, high alpha fiber.
Micropores: small pore size, a large number of perforations, filtering out fine particles, and the airflow is unobstructed; the size of the pores is normally distributed, expressed by the following parameters–maximum aperture and average aperture.
Strength: expressed in terms of bursting strength, stiffness, tensile strength, and physical strength of tear;