ASTM D3748-98

Standard Practice for Evaluating High-Density Rigid Cellular Thermoplastics

SCOPE
1.1 This practice covers the basic test procedures for determination of the physical properties and reporting of data for high-density rigid cellular thermoplastics. Note 1-There is no ISO standard similiar to this practice.

General Information

• Status: Historical
• Publication Date: 09-Jul-1998
• ICS: 83.080.20 - Thermoplastic materials
• Technical Committee: D20 - Plastics
• Drafting Committee: D20.22 - Cellular Materials - Plastics and Elastomers

Relations

• Replaced By: ASTM D3748-03 - Standard Practice for Evaluating High-Density Rigid Cellular Plastics
• Effective Date: 10-Sep-2003

Standards Content (Sample)

NOTICE: This standard has either been superceded and replaced by a new version or discontinued.
Contact ASTM International (www.astm.org) for the latest information.
Designation: D 3748 – 98
Standard Practice for
Evaluating High-Density Rigid Cellular Thermoplastics
This standard is issued under the fixed designation D 3748; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (e) indicates an editorial change since the last revision or reapproval.
1. Scope * 3. Significance and Use
1.1 This practice covers the basic test procedures for deter- 3.1 This practice provides appropriate testing methods, and
mination of the physical properties and reporting of data for a specific data reporting procedure for high-density rigid
high-density rigid cellular thermoplastics. cellular thermoplastics.
NOTE 1—This practice and ISO Standard 9054 are not technically
4. Terminology
equivalent.
4.1 Definitions:
2. Referenced Documents 4.1.1 cellular plastics—plastics containing numerous small
cavities (cells), interconnecting or not, distributed throughout
2.1 ASTM Standards:
the mass. These cells cannot be mechanically assembled, but
C 177 Test Method for Steady-State Heat-Flux Measure-
are produced through the “in situ” plastics processing methods.
ments and Thermal Transmission Properties by Means of
2 4.1.2 density, apparent—the mass, in air, of a unit volume
the Guarded Hot Plate Apparatus
of a material.
C 518 Test Method for Steady-State Heat-Flux Measure-
3 3
4.1.3 high density—greater than 20 lb/ft or 320 kg/m (0.32
ments and Thermal Transmission Properties by Means of
g/cm ) apparent density.
Heat Flow Meter Apparatus
4.1.4 rigid—having an apparent flexural modular greater
D 149 Test Method for Dielectric Breakdown Voltage and
than 689.5 MPa (100 000 psi) when tested at 23°C in accor-
Dielectric Strength of Solid Electrical Insulating Materials
dance with Test Methods D 790.
at Commercial Power Frequencies
4.1.5 skin—a relatively dense layer at the surface of a
D 570 Test Method for Water Absorption of Plastics
cellular polymeric material.
D 618 Practice for Conditioning Plastics and Electrical
4.1.6 thermoplastic, n—a plastic that repeatedly can be
Insulating Materials for Testing
softened by heating and hardened by cooling through a
D 638M Test Method for Tensile Properties of Plastics
temperature range characteristic of the plastic, and that in
[Metric]
softened state can be shaped by flow into articles by molding
D 648 Test Method for Deflection Temperature of Plastics
or extrusion.
Under Flexural Load
4.1.7 For definitions of other terms used in this practice,
D 695 Test Method for Compressive Properties of Rigid
4 refer to Terminology D 883.
Plastics
D 696 Test Method for Coefficient of Linear Thermal Ex-
5. Sample Preparation
pansion of Plastics
5.1 Samples may be processed directly into proper size
D 790 Test Methods for Flexural Properties of Unreinforced
specimens or prepared from larger sections as specified in each
and Reinforced Plastics and Electrical Insulating Materi-
4 individual test.
als
4 5.2 The report section should be precise as to the manner of
D 883 Terminology Relating to Plastics
sample preparation.
D 1622 Test Method for Apparent Density of Rigid Cellular
Plastics
6. Conditioning
6.1 Condition specimens prior to testing in accordance with
This practice is under the jurisdiction of ASTM Committee D-20 on Plastics
Procedure A of Practice D 618.
and is the direct responsibility of Subcommittee D20.22 on Cellular Materials—
Plastics and Elastomers.
7. Number of Test Specimens
Current edition approved July 10, 1998. Published December 1998. Originally
published as D 3748 – 78. Last previous edition D 3748 – 94.
7.1 Cellular plastics are often nonuniform in density distri-
Annual Book of ASTM Standards, Vol 04.06.
bution; therefore, there should be a minimum of five specimens
Annual Book of ASTM Standards, Vol
...