Permeability Cup
Product Code : SCL-CLE-11456
Description:
The Permeability Cup is a specialized piece of Science Educational Laboratory Equipment essential in Material Science, Chemical Engineering, and Coatings Technology for accurately measuring the permeability and permeance of films. This includes materials like paints, varnishes, plastics, cellophane, and protective coatings.
Function: It is utilized in a standardized test to determine the rate at which water vapor (or other specified vapors) passes through a film. This measurement is critical for assessing the barrier properties of a material.
Design & Material: The cups are constructed entirely from high-grade Stainless Steel. This material ensures corrosion resistance and dimensional stability, which are crucial for maintaining the integrity and accuracy of long-duration weight change measurements.
Measurement Principle: The cup holds a desiccant or liquid (often water). A sample film is sealed across the cup's opening. The change in the cup's total weight is measured over a specific period, allowing for the calculation of the rate of vapor transmission relative to the film's thickness. This directly quantifies the material's permeability.
Usage:
The Permeability Cup is vital for practical training and research in material barrier properties:
Barrier Property Testing: Used to conduct standardized tests (often following American Society for Testing and Materials standards) to measure the Water Vapor Transmission Rate (WVTR) of packaging films, paints, and protective coatings.
Product Formulation: Enables students and researchers to evaluate and compare the effectiveness of different coating formulations (e.g., assessing how different binders or pigments affect the film's barrier to moisture).
Material Comparison: Critical for educational demonstrations of how polymeric structure influences a film's ability to resist the passage of moisture or gas, a core concept in polymer science.
Durability Assessment: Provides data essential for predicting the long-term performance and durability of materials exposed to humid or demanding environments.
