Astm D618-21 Pdf Official
ASTM D618-21 provides a crucial framework for conditioning plastics to ensure the reproducibility of mechanical, thermal, and electrical testing by controlling temperature and humidity. By establishing procedures like Procedure A (
humidity), this standard eliminates environmental variables that, if not controlled, would cause inconsistent data across different laboratory settings and geographies. For more detailed information on this standard, you can search for "ASTM D618-21 PDF" on the official ASTM International website.
ASTM D618-21 establishes standard procedures for conditioning plastic materials to ensure accurate and reproducible results for physical, electrical, and mechanical tests. This standard defines environmental requirements, such as a standard laboratory atmosphere of 23°C and 50% relative humidity, to equilibrate test specimens before evaluation. For more details, visit ASTM International
Standard Practice for Conditioning Plastics for Testing - ASTM
ASTM D618-21 is the current standard practice for conditioning plastics for testing. Published in July 2021, it establishes standardized temperature and humidity conditions to ensure reproducible results across different laboratories and materials. Core Conditioning Procedures astm d618-21 pdf
The standard defines several specific procedures based on the material's requirements: Procedure A: Standard laboratory atmosphere (typically relative humidity). Procedure B: Oven conditioning followed by desiccation. Procedure C: Conditioning via water immersion. Procedure D: Exposure to high humidity conditions. Key Significance
Reproducibility: Standardizes conditions so that physical and electrical property tests (which are highly sensitive to temperature and moisture) can be reliably compared.
Equilibrium: While conditioning aims to bring materials into equilibrium with room conditions, some materials may require 20 to 100+ days to reach true substantial equilibrium depending on thickness.
Precedence: If a specific material specification exists (e.g., under ASTM D4000), that specification's requirements take precedence over D618. Accessing the Full Document ASTM D618-21 provides a crucial framework for conditioning
ASTM standards are copyrighted and typically require a purchase. You can find the official document and related "Redline" versions (which highlight changes from the previous 2013 version) at these official distributors:
ASTM International: The primary source for the standard and digital subscriptions.
ANSI Webstore: Provides the standard in PDF format with Digital Rights Management (DRM).
Accuris (formerly IHS Markit): Offers various formats and historical versions. Frequently Asked Questions Who Needs ASTM D618-21
Standard Practice for Conditioning Plastics for Testing - ASTM
Frequently Asked Questions
Who Needs ASTM D618-21?
You require a copy of ASTM D618-21 pdf if you work in any of the following roles:
- Quality Control (QC) Labs: Testing incoming raw plastic pellets or finished molded parts.
- R&D Engineers: Characterizing new polymer formulations.
- Third-party Testing Facilities: Offering mechanical testing (tensile, flexural, Izod impact) per ASTM standards.
- Academic Researchers: Publishing data that requires reproducibility.
- Compliance Officers: Ensuring ISO 17025 accreditation aligns with ASTM conditioning protocols.
Note: Many ASTM test methods (e.g., D638 for tensile properties, D790 for flexural properties) explicitly require that specimens be conditioned per D618 before testing.
The Cost of Ignoring ASTM D618-21
Failing to condition specimens can lead to:
- Failed audits (ISO 17025, NADCAP).
- Disputed results with suppliers or customers.
- Product recalls due to out-of-spec field performance.
One well-known case involved nylon gears that cracked in the field because the supplier tested them as-molded (dry-as-molded) rather than conditioning them to equilibrium per D618-21. The dry-as-molded strength was 30% higher than the conditioned strength—a disastrous overestimation.