QUALITY CONTROL

“7-Rigorous Steps – Uncompromising Commitment to Total Quality”

At THNA Group, quality is not just a commitment — it is a systemized standard embedded across every stage of production. From raw material extraction to final product delivery, each batch undergoes 7 rigorous quality control steps to ensure consistency, international standards compliance, and absolute stability.

7-Step Quality Control Process:
On-site Material Classification
01

On-site Material Classification

At the quarry site, raw stones are categorized based on their physical and chemical properties to align with the specifications of various industries: plastics, paper, paint, rubber...

Pre-transport Grading
02

Pre-transport Grading

Before transportation, raw materials are classified into grades A – B – C to determine processing methods and improve accuracy in blending.

Incoming Material Inspection
03

Incoming Material Inspection

Upon arrival at the factory, all stone materials are inspected by the KCS team (Quality Control Dept.) directly on the truck, based on predefined specifications for each product type.

Cleaning – Re-sorting – Third Inspection
04

Cleaning – Re-sorting – Third Inspection

Stones are stripped of impurities, thoroughly washed, and re-sorted by whiteness and color to ensure optimal input before grinding.

  • 05
    In-process Quality Monitoring (Online)

    During grinding, the KCS team performs real-time quality monitoring with scheduled checks every 30 minutes using cutting-edge instruments:

  • 06
    • Malvern Mastersizer 3000E – Particle size analysis
    • Konica Minolta CR410 – Whiteness measurement
    • Ohaus MB45 – Moisture content analysis If any deviation is detected, the automated adjustment system activates immediately to maintain consistent product quality.
  • 07
    This strict 7-step protocol guarantees the reliability and uniformity THNA Group is globally trusted for.