Gardner Color: Liquid Standard (No. 5)

Gardner Liquid Color Standard No. 5: Your Reference for Organic Impurities Testing

The Gardner Liquid Color Standard No. 5 serves as a crucial color reference standard for conducting the ASTM C40 and AASHTO T 21 test methods. These tests are essential for determining the presence of harmful organic impurities in fine aggregates, such as sand, before they are used in cement mortar or concrete.

How it Works: The test involves mixing a sample of the fine aggregate with a 3% sodium hydroxide solution. After 24 hours, the color of the liquid above the sample is compared to the Gardner Liquid Color Standards. If the test liquid is darker than the Gardner No. 5 standard, it indicates a potentially harmful level of organic impurities, meaning the aggregate may not be suitable for use without further testing or washing.

This standard provides a reliable and stable visual benchmark, ensuring consistent and accurate test results. It is an alternative to using the Organic Impurities Test Set, offering a pre-made, stable reference color.

The liquid standard is securely sealed within a 0.47 x 4.6in (11.9 x 116mm) Dia.xH glass tube, clearly marked with its Gardner number and protected by a case to ensure its integrity. With a guaranteed shelf life of five years, you can rely on its accuracy for years to come.

Features:

• Provides a precise Gardner No. 5 color reference for accurate visual comparison.
• Essential for testing organic impurities in fine aggregates.
• Ready-to-use alternative to lab-prepared solutions.
• Sealed glass tube design ensures stability and prevents contamination.
• Long five-year shelf life offers excellent value and reliability.

Product Dimensions: 0.47 x 4.6in (11.9 x 116mm) Dia. x H

Meets Test Methods:

• AASHTO T 21: Organic Impurities in Fine Aggregates for Concrete
• ASTM C40/40M: Standard Test Method for Organic Impurities in Fine Aggregates for Concrete