ASTM D8349-21

This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the
Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
Designation:D8349 −21
Standard Classification System for and Basis of Specifications
for
Thermoplastic Joining Interface Materials for Creation of
Joints Between Different Materials for the Production of End
Items or Parts that are Intended to be Disassembled and/or
Reassembled
This standard is issued under the fixed designation D8349; 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 (´) indicates an editorial change since the last revision or reapproval.
1. Scope 1.6 The following precautionary caveat pertains only to the
test methods portion, Section 11, of this classification system.
1.1 This classification system covers thermoplastic
This standard does not purport to address all of the safety
materials, used as joining materials, for the creation of joints
concerns, if any, associated with its use. It is the responsibility
between similar or dissimilar materials, to produce finished
of the user of this standard to establish appropriate safety,
products or parts that are intended to be disassembled and/or
health, and environmental practices and determine the appli-
reassembled.
cability of regulatory limitations prior to use.
1.2 This class of materials enables disconnection of the
NOTE1—Applicationexamplesarefullyrecyclablemattressesandfloor
different parts or layers of a products for refurbishing, repair
coverings. These products can be disassembled into its different parts, by
and full recovery and recycling of the joined materials, for
using heat, for refurbishing, repair and full recovery and recycling of the
instance at the end of life of the product(s), enabling the reuse
joined materials at the end of the product’s life.
of valuable resources, and hence reducing adverse impact on
1.7 This international standard was developed in accor-
the environment.
dance with internationally recognized principles on standard-
1.3 The properties included in this classification system are ization established in the Decision on Principles for the
those required to identify the materials covered. It is possible
Development of International Standards, Guides and Recom-
that there are other requirements necessary to identify particu- mendations issued by the World Trade Organization Technical
lar characteristics important to specialized applications. One
Barriers to Trade (TBT) Committee.
way of specifying them is by using the suffixes as given in
2. Referenced Documents
Section 5.
2.1 ASTM Standards:
1.4 This classification system and subsequent line callout
D618 Practice for Conditioning Plastics for Testing
(specification) are intended to provide a means of calling out
D883 Terminology Relating to Plastics
plastic materials used in the fabrication of end items or parts.
D1600 Terminology forAbbreviatedTerms Relating to Plas-
It is not intended for the selection of materials. Material
tics
selection is best made by those having expertise in the plastic
D3418 Test Method for Transition Temperatures and En-
field after careful consideration of the design and the perfor-
thalpies of Fusion and Crystallization of Polymers by
mance required of the part, the environment to which it will be
Differential Scanning Calorimetry
exposed, the fabrication process to be employed, the costs
D3892 Practice for Packaging/Packing of Plastics
involved, and the inherent properties of the material other than
D4000 Classification System for Specifying Plastic Materi-
those covered by this classification system.
als
1.5 The values stated in SI units are to be regarded as
D5279 Test Method for Plastics: Dynamic Mechanical Prop-
standard. No other units of measurement are included in this
erties: In Torsion
standard.
E29 Practice for Using Significant Digits in Test Data to
Determine Conformance with Specifications
This test method is under the jurisdiction ofASTM Committee D20 on Plastics
and is the direct responsibility of Subcommittee D20.15 on Thermoplastic Materi- For referenced ASTM standards, visit the ASTM website, www.astm.org, or
als. contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
Current edition approved Oct. 1, 2021. Published November 2021. DOI: Standards volume information, refer to the standard’s Document Summary page on
10.1520/D8349–21 the ASTM website.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
D8349−21
3 A
TABLE 2 Class—Melting Point Classification Value
2.2 ISO Standards:
Cell Limits
ISO 2555 Plastics—Resins in the liquid state or as emul-
Test method Unit
‘000’ ‘Value, ± 2 °C’
sions or dispersions—Determination of apparent viscosity
ASTM D3418 °C Not specified Specify value
using a single cylinder type rotational viscometer method
A
See 11.1, determination of the melting temperature (Tm), for specific test
conditions and supplementary instructions.
3. Terminology
3.1 Definitions—The terminology used in this classification
system is in accordance with Terminologies D883 and D1600.
7.2 For the purpose of determining conformance, all speci-
fied limits for a specification (line callout) based on this
4. Classification
classification system are absolute limits, as defined in Practice
4.1 Thermoplasticpolymersusedasjoininginterfaceforthe
E29.
creation of joints are classified into groups in accordance with
7.3 With the absolute method, an observed value or a
their material chemical structure. These groups are subdivided
calculated value is not rounded off, but is to be compared
into classes by melting point (Table 2) and further subdivided
directly to the specified limiting value. Conformance or non-
into grades as shown in Table 3 Property requirements.
conformance is based on this comparison.
4.1.1 There are no callout-lines included in this standard.A
designation, a callout-line, is drawn up by using Tables 1-3 as
8. Sampling
‘building blocks’ (see Tables 1-3 and Example 1 (Fig. 1)).
8.1 Sampling shall be statistically adequate to satisfy the
NOTE 2—Drawing up callout lines by using Tables 1-3 as ‘building
requirements of 12.4.
blocks’ implies that addition of new callout lines is not necessary
anymore.Incaseofadditionofanewmaterialtype,onlythenewmaterial 8.2 Abatch or lot shall be constituted as a unit of manufac-
type needs to be added to Table 1. Table 3 is expected to accommodate a
ture as prepared for shipment and can consist of a blend of two
range of polymer types. However, future types of Joining Interface
or more “production runs.”
Materials may require addition of another Table ‘Grade—Property Re-
quirements’ for that specific polymer type.
9. Specimen Preparation
4.1.2 To facilitate the incorporation of future or special
9.1 The material shall be dried according to the instructions
materials, the category unspecified (0) is shown in the Table 1.
of the material supplier. If no drying conditions are specified it
is recommended that the TPES material be dried8-24 hours
5. Suffixes
at 80 °C - 120 °C in an oven prior to testing.
5.1 When additional requirements are needed that are not
9.2 Note that drying at higher temperatures might change
covered by the basic requirements or cell-table requirements,
the properties of some materials. For the determination of the
they shall be indicated through the use of suffixes.
properties in Table 2 and Table 3 the moisture content after
5.2 A list of suffixes can be found in Classification D4000
drying shall be equal or less than 0.02 % moisture
(Table3)andcanbeusedtoindicateadditionalrequirementsas
appropriate. Additional suffixes will be added to that classifi-
10. Conditioning
cation system as test methods and requirements are developed
10.1 Conduct the tests in the standard laboratory atmo-
and requested.
sphere of 23 °C and 50 % relative humidity.
6. General Requirements
11. Test Methods
6.1 Basic r
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