How to inspect and ensure filters quality in Hebei Cangchen

Almost many clients ask the same question: "How do you inspect and ensure your filters quality?" Let's talk about this issue today!

1. Quality Control System

Actually, Our company has established a strict quality control system according to ISO9001 standards from raw material purchasing to packing and warehousing, to ensure effective product of the high passing rate. 

In addition, three most important key points that make our quality always best are:

● The most advanced testing equipment and technology are adopted today in Hebei Cangchen to ensure the consistant filters quality. 

● There is a quality inspection team with rich experience and technology to keep best quality in our quality control department.

● Thanks to many years of product export and feedback information from domestic and foreign customers, we have accumulated considerable experience and expertise in quality control and improvement.

ISO9001:2015 Quality Management System+Unique inside quality control flow+Experienced quality control team+Professional foreign trade team=We wholeheartedly provide high quality and efficient service to our customers.

2.Dimensional & Structural Verification

Dimensions (Length, Width, Thickness, Diameter): Consistently measure filter plates or blocks to ensure they match design specifications and tolerate minimal deviations.

Pore Density (PPI): Check pore count for consistency across batches-e.g., ensuring 10PPI, 20PPI, 30PPI filters meet target counts. Accurate PPI ensures expected filtration performance. 

3.Porosity & Pore Uniformity

Porosity Testing: Use methods like Archimedes’ principle or density comparison to determine the ratio of pore volume to total volume. A target porosity (e.g., ≥84%) ensures optimal filtration flow and efficiency. 

Light Transmittance (Porosity Proxy): Place filters on a light box with a grid overlay to assess the percentage of light passing through—higher transparency indicates fewer blind spots and more uniform pore structure.

4. Mechanical Strength & Durability

Compressive Strength: Subject samples to compression testing to ensure they withstand handling and installation without cracking. 

Thermal Shock Resistance: Simulate rapid heating/cooling cycles or test by igniting and abrupt cooling to ensure filters remain intact—essential for performance in molten metal environments. 

A rigorous inspection system ensures that Hebei Cangchen's ceramic foam filters meet high-quality standards for performance, durability, and consistency. This is crucial for providing filters that reliably remove inclusions, maintain foundry production processes, and maintain customer trust and partnership.