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Quality Control

Quality control begins with our customer partnerships. Whether it's regular aggregate or a custom product that only we can provide, our goal is to meet each customer's high-quality standards. That's why we developed our own quality control system called "QMS."  It's a keystone of The Boxley Way.
Boxley Employees Looking at Quarry


QMS stands for Quality Measurement System. With it, we grade each stone quarry’s quality performance in three very important areas:

Sampling Frequency: A measure of how often product samples are taken. This ensures that everyone at Boxley is keeping a close eye on the quality of our products.

Consistency or Standard Deviation: This measures variation (changes in the size distribution of material) within a single product. Product consistency is crucial to a quality product.

Passing Samples: A measure of the percentage of all the samples run at each quarry that meets the customer specification.

A stone quarry’s QMS score is determined by averaging the grade (percent) of these three areas. The QMS goal for each plant is 90%.

Physical Property Testing

Boxley lab technicians also perform annual physical property testing of the products from each quarry. These include:

  • Specific Gravity (useful for determining asphalt and concrete mixes)
  • Unit Weight (useful in determining the amount of product needed)
  • LA Abrasion Test (durability)
  • Soundness Test (tests how freezing and thawing affects aggregate quality)

These test results are reported in the annual Product Data Sheet, which can be downloaded below.