ASTM C373 Standard Test Method for Water Absorption, Bulk Density, Apparent Porosity, and Apparent Specific Gravity of Fired Whiteware Products

ASTM C373 Introduction

ASTM C373 is a standard that provides consistent methods of finding water absorption, bulk density, apparent porosity, and apparent specific gravity of ceramic and whiteware finished products. These physical characteristics are important insights into the quality of materials, their longevity, and their appropriateness to the purpose. Ceramic maturity assessment using density, porosity, and specific gravity measurements helps identify structural requirements for specific applications. ASTM C373 evaluates the physical characteristics of fired whiteware, ceramic tiles, and glass tiles, ensuring quality control and performance assessment and aiding producers and customers in selecting appropriate materials for specific applications. Determination of water absorption, bulk density, apparent porosity, and apparent specific gravity of non-tile fired unglazed ceramic whiteware products, glazed or unglazed ceramic tiles, and glass tiles.

ASTM C373 Certified Standard Benefits

Being certified to ASTM C373 guarantees that the labs conduct ceramic property testing utilizing globally embraced testing methods. Certification ensures a uniformity, precision, and consistency of test results and helps construct products that comply with construction and quality standards. Certified testing provides better confidence in material performance, better control of production, lower rejection rates, and high credibility on the domestic and international markets.

ASTM C373 Testing Procedure and Requirements

ASTM C373 Scope

• Addresses the identification of the absorption and density-related characteristics of fired ceramic products. 
• Applicable to whiteware, ceramic tiles, porcelain, etc., the fired materials. 
• Assesses the open porosity that affects durability and strength. 
• Applicable in quality control, product certification, and research. Not to be applied to unfired or partially fired ceramics.

ASTM C373 Equipment and Sample Preparation

ASTM C373 Use / Applications

• Water absorption assessment of frost resistance. 

• Ceramic products classification according to the levels of porosity. 

• Checking the manufacturing process and verifying the batches. 

• Ceramic formulations research and development. 

• Construction and building standards compliance testing.

ASTM C373 Common Challenges and Troubleshooting

Testing has a problem in ensuring that the sample preparation conditions are uniform; this challenges the test. Various time consumption in drying before saturation with less than satisfactory boiling, or small deviations in initial dry weight, can cause potential incorrect readings. Labs use calibrated equipment and ensure proper sample preparation.

ASTM C373 Technique, Process, and Data Collection

This is done by drying specimens to a constant mass and then controlled boiling and soaking to complete saturation. Measurements are made in the dry, saturated, and submerged weights. The data collection involves mass values needed in the estimation of absorption, density, and porosity parameters. All the measurements are systematically taken and checked against various specimens.

ASTM C373 Results and Interpretation

Water absorption percentage is used to determine the capacity of a tile to absorb water, and bulk density is used to determine the mass of a tile divided by its volume. Apparent porosity shows the percentage of open pores or vacuities in the structure of the tile, and apparent specific gravity is the weight of a tile divided by the weight of the water. The larger values are used to show denser and stronger tiles.

ASTM C373 Problem & Solution

One issue is the wrong absorption values caused by a lack of boiling or trapped air in pores. This leads to the underestimation of porosity. The answer is strict observation of boiling and soaking time, and utmost immersion of the specimen. The other problem is that surface drying is not done before weighing, and this can be addressed by standardized blotting methods before weighing.

Factors to Consider for ASTM C373

Speed
Automated weighing systems and controlled boiling systems enable the easy testing of various ceramic samples under constant saturation and measurement.

Expert
Our skilled technicians are well-trained on ASTM C373 processes, and therefore, we have followed proper drying, saturation, and weighing methodologies that would give good results in determining the physical properties of ceramics.

Cost
Our economical ASTM C373 tests optimize the laboratory resources and reduce the retesting procedure, providing high-quality ceramic property data without violating the standards.