ASTM D4640
Standard Test Method for Determining Stroke Cure Time of Thermosetting Phenol-Formaldehyde Resins
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About This Item
ASTM D4640 is the ASTM standard for determining stroke cure time of thermosetting phenol-formaldehyde resins. It provides a defined test method for evaluating how these resins progress to cure under controlled conditions, which helps support consistent product assessment and process control. For manufacturers, laboratories, and buyers working with thermosetting phenol-formaldehyde materials, the standard offers a practical reference for comparing cure behavior and supporting technical decisions.
What is ASTM D4640?
ASTM D4640, Standard Test Method for Determining Stroke Cure Time of Thermosetting Phenol-Formaldehyde Resins, describes a laboratory approach for measuring the time required for cure under a specified stroke-based test condition. The standard is focused on a particular resin family and on a specific cure-related property, rather than on broad material performance. As a result, it is commonly used as a technical tool for evaluating cure response in a controlled and repeatable way.
Where is ASTM D4640 used?
This standard is typically used in laboratories, quality control settings, and material development workflows involving thermosetting phenol-formaldehyde resins. It may support incoming material checks, batch comparison, product qualification, and research focused on cure behavior. ASTM D4640 is especially relevant where consistent cure timing matters for resin handling, processing, or downstream use, and where a documented test method is needed to compare results between suppliers, facilities, or production runs.
Why is ASTM D4640 important?
ASTM D4640 matters because cure time can influence processing efficiency, consistency, and final product reliability. A standardized method helps reduce ambiguity when testing thermosetting phenol-formaldehyde resins and supports more meaningful comparison of results across labs or production environments. It can also aid procurement and compliance decisions by giving technical teams a common basis for evaluating performance, documenting quality control results, and managing risk in resin selection and use. ASTM D4640 helps keep testing aligned and repeatable.
- Stroke cure time measurement
- Thermosetting phenol-formaldehyde resins
- Controlled laboratory testing
- Quality control and comparison
- Technical evaluation of cure behavior
- Publication Date: 2022-07-04
- Publisher: ASTM
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