Standard Test Methods for Rubber--Microcellular Urethane

SCOPE
1.1 These methods cover the preparation of a standard-size test sample and basic tests for physical property determinations of microcellular urethane rubber.  
1.2 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only.  
1.3 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 similar or equivalent ISO standard to these test methods.

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31-Dec-1999
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ASTM D3489-96(2000) - Standard Test Methods for Rubber--Microcellular Urethane
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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation:D3489–96 (Reapproved 2000)
Standard Test Methods for
Rubber—Microcellular Urethane
This standard is issued under the fixed designation D3489; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.A
superscript epsilon (e) indicates an editorial change since the last revision or reapproval.
1. Scope D1052 TestMethodforMeasuringRubberDeterioration—
Cut Growth Using Ross Flexing Apparatus
1.1 These test methods cover the preparation of a standard-
D1630 TestMethodforRubberProperty—AbrasionResis-
size test sample and basic tests for physical property determi-
tance Footwear Abrader
nations of microcellular urethane rubber.
D1938 Test Method for Tear Propagation Resistance of
1.2 The values stated in SI units are to be regarded as the
Plastic Film and Thin Sheeting by a Single-Tear Method
standard. The values given in parentheses are for information
D 2240 Test Method for Rubber Property—Durometer
only.
Hardness
1.3 This standard does not purport to address all of the
D2584 Test Method for Ignition Loss of Cured Reinforced
safety concerns, if any, associated with its use. It is the
Resins
responsibility of the user of this standard to establish appro-
D2632 Test Method for Rubber Property—Resilience by
priate safety and health practices and determine the applica-
Vertical Rebound
bility of regulatory limitations prior to use.
D3040 Practice for Preparing Precision Statements for
NOTE 1—There is no similar or equivalent ISO standard to these test
Standards Related to Rubber and Rubber Testing
methods.
D3137 Test Method for Rubber Property—Hydrolytic Sta-
bility
2. Referenced Documents
D3574 TestMethodsforFlexibleCellularMaterials—Slab,
2.1 ASTM Standards:
Bonded, and Molded Urethane Foams
D256 Test Method for Determining the Izod Pendulum
D3768 TestMethodforMicrocellularUrethanes—Flexural
Impact Resistance of Plastics
Recovery
D395 Test Methods for Rubber Property—Compression
D3769 Test Method for Microcellular Urethanes—High-
Set
Temperature Sag
D412 Test Methods for Vulcanized Rubber and Thermo-
plastic Elastomers—Tension
3. Terminology
D573 Test Method for Rubber—Deterioration in an Air
3.1 Description of Term Specific to This Standard:
Oven
3.1.1 microcellular urethane—a rubber material made by
D575 TestMethodsforRubberPropertiesinCompression
the interaction of a polyol and an organic isocyanate, having
D624 Test Method for Tear Strength of Conventional
cell diameters in the range from 0.0001 to 0.001 mm, with a
Vulcanized Rubber and Thermoplastic Elastomers
3 3
minimum density of 160 kg/m (10 lb/ft ).
D790 TestMethodsforFlexuralPropertiesofUnreinforced
and Reinforced Plastics and Electrical Insulating Materi-
4. Significance and Use
als
4.1 Tests made on materials herein prescribed can be of
D1044 Test Method for Resistance of Transparent Plastics
considerable value in comparing physical properties of differ-
to Surface Abrasion
ent materials, in controlling manufacturing processes, and as a
basis for writing specifications.
1 4.2 Before proceeding with these test methods, reference
These test methods are under the jurisdiction of ASTM Committee D20 on
shouldbemadetothespecificationofthematerialbeingtested.
Plastics and are the direct responsibility of Subcommittee D20.22 on Cellular
Materials—Plastics and Elastomers.
Anytestspecimenpreparation,conditioning,ordimensions,or
Current edition approved July 10, 1996. Published September 1996. Originally
published as D3489–76. Last previous edition D3489–85(1990).
This revision includes addition of the following: an ISO equivalency statement,
a material specifications statement, and a keywords section.Also, this revision now Annual Book of ASTM Standards, Vol 08.02.
references another ASTM test method for the Ash Test. Discontinued—see 1987 Annual Book of ASTM Standards, Vols 09.01 and
Annual Book of ASTM Standards, Vol 08.01. 09.02.
3 6
Annual Book of ASTM Standards, Vol 09.01. Annual Book of ASTM Standards, Vol 09.02.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
D3489
combination thereof, and testing parameters covered in the 7.2.3 A“test result” is the average result from the testing of
materials specification shall take precedence over those men- three dumbbell specimens.
tioned in these test methods. If there are no material specifi-
8. Tear
cations, then the default conditions apply.
8.1 Using Die C, determine the tear strength in accordance
5. Sampling
with Test Method D624. Cut the specimen from the 3.15-mm
( ⁄8-in.) sample, retaining the molded surface.
5.1 Test samples can be made in any suitable mold. The
8.2 DeterminethesplittearstrengthinaccordancewithTest
following three sizes are recommended (length, width, and
1 Method D1938. Cut the specimen from the 3.15-mm ( ⁄8-in.)
thickness): 305 by 152 by 3.15 mm (12 by 6 by ⁄8 in.), 305 by
sample. The direction of tear shall include both molded
152by6.3mm(12by6by ⁄4in.),and305by152by12.5mm
1 surfaces.
(12 by 6 by ⁄2 in.).
8.3 Determine the block tear in accordance with Test
5.2 Theprocedureusedtopreparethetestsamplerelatingto
Methods D3574, except the specimen shall be 19.0 mm (0.75
component ratios, temperature, mixing direction, mold tem-
in.)wideby12.5mm(0.5in.)thick.Theteardirectionshallbe
perature, and curing conditions shall conform to the manufac-
through the core retaining both molded surfaces.
turer’s recommendations.
5.3 The test sample shall be allowed to age a minimum of
9. Hardness
48 h before testing, at 23 6 2°C (73.4 6 3.6°F) and 50 65%
9.1 DeterminethehardnessinaccordancewithTestMethod
relative humidity.
D2240 on the 6.3-mm ( ⁄4-in.) thick sample. Report the initial
and 5-s drift value. If the determination is to be made at
6. Density
subnormal temperatures, condition the instrument at the same
6.1 Procedure—Section density can be determined on any
temperature. To prevent moisture from damaging the instru-
thickness of molded material. The minimum specimen size
3 3 ment, it is advisable to place the tester directly in a desiccator
shall be 8.19 cm (0.5 in. ). Weigh and measure the volume of
after removing from the cold box.
the specimen. Calculate the density as follows:
10. Compression Set
W
Density,kg/m 5
V
10.1 DeterminethecompressionsetinaccordancewithTest
MethodsD395,MethodB,using22hat70°C(158°F).Cutthe
where:
specimen from the 12.5-mm (0.5-in.) sample, retaining the
W = mass of specimen, kg, and
molded surfaces.
V = volume of specimen, m .
6.2 Report—Report the following information:
11. Compression Deflection
6.2.1 Density, to the nearest 1.6 kg/m , and
11.1 Determine the compression deflection at 25% deflec-
6.2.2 Thickness.
tioninaccordancewithTestMethodsD575.Cutthespecimen
from the 12.5-mm (0.5-in.) sample, retaining the molded
7. Tensile Properties
surfaces. The sample is not preflexed. The initial compression
7.1 DeterminethetensilepropertiesinaccordancewithTest
value is reported.
Methods D412. Cut tension specimens using the DieAor any
othersuitabledieinaccordancewithTestMethodsD412from
12. Resilience
1 1
the3.15-mm( ⁄8-in.)or6.3-mm( ⁄4-in.)tes
...

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