ASTM D7750-12(2017)
Standard Test Method for Cure Behavior of Thermosetting Resins by Dynamic Mechanical Procedures using an Encapsulated Specimen Rheometer

Standard No.

ASTM D7750-12(2017)

Release Date

2012

Published By

American Society for Testing and Materials (ASTM)

Status

Be replaced

Replace By

ASTM D7750-23

Latest

ASTM D7750-23

Scope

5.1 This method provides a simple means of characterizing the cure behavior of a thermosetting resin specimen that is a representation of a composite part. The diameter of the specimen is approximately 38 mm and the thickness ranges from 2.6 to 3.2 mm. This corresponds to a sample volume of approximately 3 to 4 cm³. The data may be used for quality control, research and development, and verifying the cure within processing equipment including autoclaves.

5.2 Dynamic mechanical testing provides a sensitive method for determining cure characteristics by measuring the elastic and loss moduli as a function of temperature or time, or both. Plots of cure behavior and tan delta of a material provide graphical representation indicative of cure behavior under a specified time-temperature profile. The presence of fibers within the resin may change the dynamic properties measured within a material. However, it is still possible to compare different resins with the same fiber structure and obtain the relative difference due to the resin cure properties.

5.3 This method can be used to assess the following:

5.3.1 Cure behavior, as well as changes as a function of temperature or time, or both,

5.3.2 Processing behavior, as well as changes as a function of temperature or time, or both,

5.3.3 The effects of processing treatments,

5.3.4 Relative resin behavioral properties, including cure behavior, damping and impact resistance,

5.3.5 The effects of reinforcement on cure.

5.3.6 The effects of materials used to bond the resin and reinforcement,

5.3.7 The effect of formulation additives that might affect processability or performance.

5.4 This provides a method to assess the cure properties of a thermosetting resin containing woven fiber or other reinforcing materials.

5.5 This method is valid for a wide range of oscillation frequencies typically from 0.002 to 50 Hz.

Note 1: It is recommended that low-frequency test conditions, generally 1 to 2 Hz, be used to generate more definitive cure-behavior information. Slower frequencies will miss important cure properties. Faster frequencies will reduce sensitivity to cure.

1.1 This method covers the use of dynamic mechanical instrumentation for determination and reporting of the thermal advancement of cure behavior of thermosetting resin on an inert filler or fiber in a laboratory. It may also be used for determining the cure properties of filled resins and resins without reinforcements. These encapsulated specimens are deformed......

ASTM D7750-12(2017) Referenced Document

• ASTM D3878 Standard Terminology Composite Materials
• ASTM D4000 Standard Classification System for Specifying Plastic Materials
• ASTM D4065 Standard Practice for Plastics: Dynamic Mechanical Properties: Determination and Report of Procedures
• ASTM D4092 Standard Terminology: Plastics: Dynamic Mechanical Properties
• ASTM D4473 Standard Test Method for Plastics: Dynamic Mechanical Properties: Cure Behavior
• ASTM D6507 Standard Practice for Fiber Reinforcement Orientation Codes for Composite Materials
• ASTM D7028 Standard Test Method for Glass Transition Temperature (DMA Tg) of Polymer Matrix Composites by Dynamic Mechanical Analysis (DMA)
• ASTM E380 Standard Practice for Use of the Internation System of Units (SI) (the Modernized Metric System)

ASTM D7750-12(2017) history

• 2023 ASTM D7750-23 Standard Test Method for Cure Behavior of Thermosetting Resins by Dynamic Mechanical Procedures using an Encapsulated Specimen Rheometer
• 2012 ASTM D7750-12(2017) Standard Test Method for Cure Behavior of Thermosetting Resins by Dynamic Mechanical Procedures using an Encapsulated Specimen Rheometer
• 2012 ASTM D7750-12 Standard Test Method for Cure Behavior of Thermosetting Resins by Dynamic Mechanical Procedures using an Encapsulated Specimen Rheometer