Linnstone QC Standard

As a local stone distributor in the United States, Linnstone upholds high quality standards and is dedicated to providing customers with stable and reliable stone products. To further standardize our product quality management, we have established this standard, which applies to the inspection procedures and delivery requirements for slabs supplied in the U.S. market.

This document outlines key quality inspection items, including color consistency, flatness, thickness tolerance, polishing finish, and surface defects (such as black dots, foreign materials, cracks, scratches, etc.). It also defines grading standards (Grade A/B/C) to help customers effectively evaluate and verify slab quality during fabrication, installation, and final project acceptance.

Whether you are a fabricator, contractor, or project manager, this document serves as a quality reference throughout your collaboration with Linnstone, helping you better understand our commitment to product consistency and performance reliability.