ASTM D957-95
(Practice)Standard Practice for Determining Surface Temperature of Molds for Plastics
Standard Practice for Determining Surface Temperature of Molds for Plastics
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1.1 This practice is intended for determining the temperature at a specified point or points on the surface of the cavity and base of a mold for plastics. By determining the temperature at as many points as deemed necessary, the overall temperature condition of the surface can be determined.
1.2 The values stated in SI units are to be regarded as the standard. The values in parentheses are given 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 ISO standard.
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NOTICE: This standard has either been superseded and replaced by a new version or discontinued.
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Designation: D 957 – 95 An American National Standard
AMERICAN SOCIETY FOR TESTING AND MATERIALS
100 Barr Harbor Dr., West Conshohocken, PA 19428
Reprinted from the Annual Book of ASTM Standards. Copyright ASTM
Standard Practice for
Determining Surface Temperature of Molds for Plastics
This standard is issued under the fixed designation D 957; 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 ing satisfactory specimens are influenced by the temperature of
the mold. It is desirable to know the actual mold temperature
1.1 This practice is intended for determining the tempera-
which may be different from the mold temperature control
ture at a specified point or points on the surface of the cavity
medium.
and base of a mold for plastics. By determining the temperature
4.2 The user should be aware of temperature differences
at as many points as deemed necessary, the overall temperature
across the mold/thermocouple interface and at leads and should
condition of the surface can be determined.
take precautions to minimize such differences.
1.2 The values stated in SI units are to be regarded as the
standard. The values in parentheses are given for information
5. Apparatus
only.
5.1 Pyrometer—A calibrated surface pyrometer traceable to
1.3 This standard does not purport to address all of the
a National Institute of Standards and Technology (NIST)
safety concerns, if any, associated with its use. It is the
standard and accurate to within 61.5°C shall be used.
responsibility of the user of this standard to establish appro-
priate safety and health practices and determine the applica-
6. Procedure
bility of regulatory limitations prior to use.
6.1 The size, shape, and contours of a mold will determine
NOTE 1—There is no similar ISO standard.
the location and number of points at which temperature
readings should be observed. Take temperature readings at as
2. Referenced Documents
many points as deemed necessary to determine the temperature
2.1 ASTM Standards:
condition of the mold surface. At a minimum, it is suggested
D 958 Practice for Determining Temperatures of Standard
that temperature be measured at the mold center, near the edge,
ASTM Molds for Test Specimens of Plastics
and at least two different but int
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FIG. 1 Bored Forgings
Note 1: Sensitivity multiplication factor such that a 10 % indication at the forging bore surface will be equivalent to a 1/8 in. [3 mm] diameter flat bottom hole. Inspection frequency: 2.0 MHz or 2.25 MHz. Material velocity: 2.30 in./s × 105 in./s [5.85 cm/s × 105 cm/s].
FIG. 2 Solid Forgings
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FIG. 3 Conversion Factors to Be Used in Conjunction with Fig. 1 and Fig. 2 if a Change in the Reference Reflector Diameter is Required
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