ASTM D707-98
(Specification)Standard Specification for Cellulose Acetate Butyrate Molding and Extrusion Compounds
Standard Specification for Cellulose Acetate Butyrate Molding and Extrusion Compounds
SCOPE
1.1 This specification covers requirements for plasticized cellulose acetate butyrate thermoplastic compounds suitable for injection molding and extrusion. These compounds have a butyryl content of not less than 35% and may or may not contain dyes and pigments. This specification does not include special materials compounded for special applications.
1.2 The values stated in SI units are to be regarded as the standard.
1.3 The following safety hazards caveat pertains only to the test method portion, Section 12, of this specification. 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- There is no equivalent ISO standard.
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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
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Designation: D 707 – 98
Standard Specification for
Cellulose Acetate Butyrate Molding and Extrusion
Compounds
This standard is issued under the fixed designation D 707; 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 2. Referenced Documents
1.1 This specification covers requirements for plasticized 2.1 ASTM Standards:
cellulose acetate butyrate thermoplastic compounds suitable D 149 Test Method for Dielectric Breakdown Voltage and
for injection molding and extrusion. These compounds have a Dielectric Strength of Solid Electrical Insulating Materials
butyryl content less than 38 % and an acetyl content less than at Commercial Power Frequencies
15 % and may or may not contain dyes and pigments. This D 256 Test Method for Determining the Pendulum Impact
specification does not include special materials compounded Resistance of Notched Specimens of Plastic
for special applications. Cellulosic plastic materials, being D 257 Test Methods for DC Resistance or Conductance of
thermoplastic, are reprocessable and recyclable. This specifi- Insulating Materials
cation allows for the use of those cellulosic materials, provided D 570 Test Method for Water Absorption of Plastics
that all specific requirements of this specification are met. D 618 Practice for Conditioning Plastics and Electrical
1.2 The properties included in this specification are those Insulating Materials for Testing
required to identify the compositions covered. There may be D 635 Test Method for Rate of Burning and/or Extent and
other requirements necessary to identify particular character- Time of Burning of Self-Supporting Plastics in a Horizon-
istics important to specialized applications. These may be tal Position
specified by using the suffixes as given in Section 5. D 638M Test Method for Tensile Properties of Plastics
1.3 This classification system and subsequent line call out [Metric]
(specification) are intended to provide a means of calling out D 790 TestMethodsforFlexuralPropertiesofUnreinforced
plastic materials used in the fabrication of end items or parts. and Reinforced Plastics and Electrical Insulating Materi-
It is not intended for the selection of materials. Material als
selection should be made by those having expertise in the D 792 TestMethodsforDensityandSpecificGravity(Rela-
plastic field after careful consideration of the design and tive Density) of Plastics by Displacement
performance required of the part, environment to which it will D 883 Terminology Relating to Plastics
be exposed, fabrication process to be employed, costs in- D 1003 Test Method for Haze and Luminous Transmittance
volved, and inherent properties of the material other than those of Transparent Plastics
covered by this classification system. D 1600 Terminology for Abbreviated Terms Relating to
1.4 The values stated in SI units are to be regarded as Plastics
standard. D 1729 Practice for Visual Evaluation of Color Differences
1.5 The following safety hazards caveat pertains only to the of Opaque Materials
test method portion, Section 12, of this specification. This D 1898 Practice for Sampling of Plastics
standard does not purport to address all of the safety concerns, D 3641 Practice for Injection Molding Test Specimens of
if any, associated with its use. It is the responsibility of the user Thermoplastic Molding and Extrusion Materials
of this standard to establish appropriate safety and health D 3892 Practice for Packaging/Packing of Plastics
practices and determine the applicability of regulatory limita- D 4000 Classification System for Specifying Plastic Mate-
tions prior to use. rials
D 5033 GuidefortheDevelopmentofStandardsRelatingto
NOTE 1—There is no equivalent or similar ISO standard.
This specification is under the jurisdiction of ASTM Committee D-20 on
Plastics and is the direct responsibility of Subcommittee D20.15 on Thermoplastic Annual Book of ASTM Standards, Vol 10.01.
Materials. Annual Book of ASTM Standards, Vol 08.01.
Current edition approved July 10, 1998. Published March 1999. Originally Annual Book of ASTM Standards, Vol 06.01.
published as D 707 – 43 T. Last previous edition D 707 – 96. Annual Book of ASTM Standards, Vol 08.02.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
D 707
the Proper Use of Recycled Plastics
2 = Class 2—Plasticizer range from 12 to 23 % (see
E 308 Practice for Computing the Colors of Objects by
Table CAB, Footnote 1).
Using the CIE System
2 = Grade 2—Extrusion application.
F11 = Flammability requirement—Burn rate maximum of
3. Terminology
5 cm/min when tested in accordance with Test
Method D 635.
3.1 Definitions—The terminology used in this specification
is in accordance with Terminologies D 883 and D 1600.
NOTE 2—“CAB0122” corresponds to the following physical property
requirements in Table CAB:
4. Classification
Specific gravity: 1.15–1.19.
Tensile stress at yield: 19 MPa min.
4.1 This specification covers the following groups, classes,
Flexural modulus: 760 MPa min.
and grades (see Table CAB):
Izod impact strength: 285 J/m min.
Water absorption: 1.6 % max.
4.1.1 Group 01—High impact strength.
Weight loss on heating: 2.7 % max.
4.1.2 Group 02—High tensile strength.
4.1.3 Class—According to plasticizer content and proper-
6. Materials and Manufacture
ties specified in Table CAB.
6.1 Materials supplied in these forms shall be as uniform in
4.1.4 Grade 1—For injection molding (general purpose).
composition and size, and as free of contamination, as can be
4.1.5 Grade 2—For extrusion (see requirement in 6.5).
achieved by good manufacturing practice.
6.2 These materials may contain colorants in the nominal
5. Suffixes
amounts ordinarily employed, but such additives shall not alter
5.1 When requirements are needed that are not covered in
the ability of the materials to meet the specified properties.
Table CAB they shall be indicated through the use of suffixes.
6.3 The color of material supplied shall be comparable,
5.2 A list of suffixes can be found in Classification System
within commercial match tolerances, to the color of standard
D 4000 (Table 3) and may be used for additional requirements
samples prepared by the manufacturer.
as appropriate. Additional suffixes will be added to that
6.4 Grade 2 materials shall be verified by the manufacturer
classification system as test methods and requirements are
to be of extrusion quality.
developed and requested.
5.3 Color and opacity shall be within the limits defined in
7. Physical Requirements
6.3.
7.1 Test specimens of the material shall conform to the
5.4 Some of the more commonly used suffixes for cellulose
requirements prescribed in Table CAB.
acetate butyrate are shown as follows:
7.2 Molded specimens, for those tests requiring them, shall
E = electrical requirements as designated by the following digits:
be prepared in accordance with Section 10.
First Digit
7.3 Conformance to the requirements of this specification
1 = volume resistivity—Test Methods D 257.
dielectric strength—Test Method D 149 (short-time/step-by-step).
shall be determined in accordance with Section 11, unless
Second Digit
otherwise specified.
1 = volume resistivity and dielectric strength meet property require-
ments as shown in Table 1.
8. Sampling
F = flammability requirements as designated by the following digits:
8.1 The material shall be sampled in accordance with
First Digit
1 = rate of burning—Test Method D 635, specimen size: 125 mm long
Sections 9 to 12 of Practice D 1898. Adequate statistical
by 12.7 mm wide by 3.2 mm thick.
sampling prior to packaging shall be considered an acceptable
Second Digit
alternative.
1 = burn rate 5 cm/min, max.
8.2 Forsamplingpurposes,abatchorlotshallbeconsidered
T = transmittance requirements as designated by the following digits:
aunitofmanufactureaspreparedforshipmentandmayconsist
First Digit
of a blend of two or more production runs of material.
1 = total luminous transmittance determined in accordance with Proce-
dure A of Test Method D 1003.
Second Digit
9. Number of Tests
1 = total luminous transmittance, 80 % min.
9.1 Routine testing of each batch or lot shall be limited to
5.5 An example of this classification system for a high-
properties designated in Table CAB of this specification.
impact cellulose acetate butyrate formulation would be as
9.2 One set of samples for those tests that are designated
follows:
(Section 12) shall be considered sufficient for testing the batch
CAB0122F11
or lot. The average results from those samples shall comply
with the requirements prescribed in this specification.
9.3 If any failure occurs, the materials may not be certified
CAB = Table CAB property requirements.
to this specification.
01 = Group 01—high impact strength.
10. Specimen Preparation
10.1 Physical property requirements in Table CAB are
Annual Book of ASTM Standards, Vol 08.03. basedoninjection-moldedspecimens3.2mmthick.Specimens
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