ASTM D2346-21 PDF

Overview

ASTM D2346-21: Standard Test Method for Apparent Density of Leather is an internationally recognized method established by ASTM International for determining the apparent density of leather specimens. This standard provides clear procedures for measuring the weight, area, and thickness of conditioned leather samples in order to calculate their apparent density. By evaluating the apparent density, manufacturers, laboratories, and quality assurance teams can assess the degree of compression or loading in leather materials. It is important to note that this test method is not suitable for very soft leathers, such as chamois, or for wet blue and wet white leathers, as their thickness cannot be reliably measured using the specified procedures.

Key Topics

Apparent Density for Leather:

• Defined as the weight per unit volume of bulk leather, conditioned according to ASTM D1610.
• Requires precise measurement of specimen weight, area, and thickness.
• Utilizes tools such as a round die, mallet or clicking machine, steel tape or ruler, balance, and thickness gauge.

Scope and Limitations:

• Applicable only to certain types of leather; excludes very soft leathers like chamois and unsuited for wet blue or wet white leather.
• Values are stated in inch-pound units as standard; SI units are provided for convenience only.
• Users are responsible for adhering to appropriate safety, health, and environmental practices.

Test Method Process:

• Condition the leather specimen as specified.
• Cut a disk-shaped test specimen using a round die.
• Weigh the specimen to the nearest 0.001 g.
• Measure the thickness at four points and calculate the average value.
• Determine the area precisely and calculate the apparent density.

Applications

Quality Control:

• Used by leather producers and product manufacturers to ensure consistency in material density.
• Supports detection of excessive compression or improper loading during processing.

Product Development:

• Enables researchers and developers to evaluate material performance based on density, informing decisions for applications such as footwear, upholstery, automotive interiors, and fashion accessories.

Regulatory Compliance:

• Adoption of ASTM D2346-21 allows organizations to demonstrate adherence to industry-recognized testing protocols, meeting procurement and regulatory requirements.

Inter-laboratory Consistency:

• Establishes a reliable, repeatable method for cross-laboratory comparisons and proficiency testing, enhancing traceability and transparency in results.

Related Standards

Referenced ASTM Standards:

• ASTM D1610 - Practice for Conditioning Leather and Leather Products for Testing: Ensures specimens are prepared consistently for accurate and comparable results.
• ASTM D1813 - Test Method for Measuring Thickness of Leather Test Specimens: Specifies procedures for reliable thickness measurement, integral to density calculations.
• ASTM D2347 - Test Method for Measuring Area of Leather Test Specimens: Details methods to determine specimen area, essential for density determination.

Practical Value

Adopting ASTM D2346-21 provides leather industry professionals with a standardized approach, enabling:

• Reliable material assessments for product consistency and quality assurance.
• Objective benchmarks for comparing leather types and batches.
• Support in documenting compliance with international trade, procurement, and material specification requirements.

For further information or to obtain the official standard, visit the ASTM International website.