Standard Test Methods for Flexural Properties of Unreinforced and Reinforced Plastics and Electrical Insulating Materials
Flexural Testing yields information about how much force it takes to cause a polymer
material to bend. The greater a material's flexural strength, the greater its resistance bending.
Possible reasons why a company might test for Flexural Properties include:
- Assist With Materials Selection Process
- Evaluation of Polymer Properties Pre- and Post-Exposure
Below you will find a brief description of the ASTM Test Method related to the topics covered above:
Significance and Use
Flexural properties as determined by these test methods are especially useful for quality control and specification purposes.
Materials that do not fail by the maximum strain allowed under these test methods (3-point bend) may be more suited to a 4-point bend test. The basic difference between the two test methods is in the location of the maximum bending moment and maximum axial fiber stresses. The maximum axial fiber stresses occur on a line under the loading nose in 3-point bending and over the area between the loading noses in 4-point bending.
Flexural properties may vary with specimen depth, temperature, atmospheric conditions, and the difference in rate of straining as specified in Procedures A and B (see also Note 7).
Before proceeding with these test methods, reference should be made to the ASTM specification of the material being tested. Any test specimen preparation, conditioning, dimensions, or testing parameters, or combination thereof, covered in the ASTM material specification shall take precedence over those mentioned in these test methods. Table 1 in Classification System D 4000 lists the ASTM material specifications that currently exist for plastics.
1.1 These test methods cover the determination of flexural properties of unreinforced and reinforced plastics, including high-modulus composites and electrical insulating materials in the form of rectangular bars molded directly or cut from sheets, plates, or molded shapes. These test methods are generally applicable to both rigid and semirigid materials. However, flexural strength cannot be determined for those materials that do not break or that do not fail in the outer surface of the test specimen within the 5.0 % strain limit of these test methods. These test methods utilize a three-point loading system applied to a simply supported beam. A four-point loading system method can be found in Test Method D 6272.
1.1.1 Procedure A, designed principally for materials that break at comparatively small deflections.
1.1.2 Procedure B, designed particularly for those materials that undergo large deflections during testing.
1.1.3 Procedure A shall be used for measurement of flexural properties, particularly flexural modulus, unless the material specification states otherwise. Procedure B may be used for measurement of flexural strength only. Tangent modulus data obtained by Procedure A tends to exhibit lower standard deviations than comparable data obtained by means of Procedure B.
1.2 Comparative tests may be run in accordance with either procedure, provided that the procedure is found satisfactory for the material being tested.
1.3 The values stated in SI units are to be regarded as the standard. The values provided in brackets are for information only.
1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
Note 1—These test methods are not technically equivalent to ISO 178.
2. Referenced Documents
- D4000 Classification System for Specifying Plastic Materials
- D4101 Specification for Polypropylene Injection and Extrusion Materials
- D5947 Test Methods for Physical Dimensions of Solid Plastics Specimens
- D618 Practice for Conditioning Plastics for Testing
- D6272 Test Method for Flexural Properties of Unreinforced and Reinforced Plastics and Electrical Insulating Materials by Four-Point Bending
- D638 Test Method for Tensile Properties of Plastics
- D883 Terminology Relating to Plastics
- E4 Practices for Force Verification of Testing Machines
- E691 Practice for Conducting an Interlaboratory Study to Determine the Precision of a Test Method
- ISO178 Plastics--Determination of Flexural Properties
flexural properties; plastics; stiffness; strength; Electrical insulating plastics; Flexural testing--electrical insulating materials; Flexural testing--plastics; Reinforced plastics; Stiffness--plastics; Unreinforced plastics; ICS Number Code 29.035.20 (Plastic and rubber insulating materials)
( Download ASTM D790 From www.ASTM.org )