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Designation: D 5289 – 07

Standard Test Method for

Rubber Property—Vulcanization Using Rotorless Cure Meters1
This standard is issued under the fixed designation D 5289; the number immediately following the designation indicates the year oforiginal 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 1.1 This test method covers a method for the measurement of selected vulcanization characteristics of rubber compounds using unsealed and sealed torsion shearcure meters. The two types of instruments may not give the same results.
NOTE 1—An alternative method for the measurement of vulcanization characteristics is given in Test Method D 2084.

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. 2. Referenced Documents 2.1 ASTM Standards: 2 D 1349 Practice for Rubber—Standard Temperatures for Testing D 1556 Test Method for Density and Unit Weight of Soil in Place by the Sand-Cone MethodD 2084 Test Method for Rubber Property—Vulcanization Using Oscillating Disk Cure Meter D 4483 Practice for Evaluating Precision for Test Method Standards in the Rubber and Carbon Black Manufacturing Industries 3. Terminology 3.1 Definitions of Terms Specific to This Standard:
1 This test method is under the jurisdiction of ASTM Committee D11 on Rubber and is the direct responsibility ofSubcommittee D11.12 on Processability Tests. Current edition approved May 1, 2007. Published June 2007. Originally approved in 1992. Last previous edition approved in 2006 as D 5289 – 06. 2 For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM Standards volume information, refer to the standard’s Document Summarypage on the ASTM website.

3.1.1 rotorless cure meter—a name for a class of cure meters that uses one of the two specimen shaping members or dies to sense the torque or stress during strain application. Rotorless cure meters do not have a third member in the form of a rotor (see definitions of cure meter in Test Methods D 1556 and D 2084). 3.1.2 torque—for an oscillating shear cure meter, the valuemeasured by a torque transducer at the peak strain amplitude of the oscillating cycle. 3.1.3 The following measurements may be taken from the recorded curve of torque as a function of time (see Fig. 1): 3.1.3.1 maximum, plateau, or highest torque—measure of the stiffness or shear modulus of the vulcanized test specimen at the vulcanization temperature, measured within a specified period of time.3.1.3.2 minimum torque—measure of the stiffness of the unvulcanized test specimen at the specified vulcanizing temperature, taken at the lowest point in the vulcanization curve. 3.1.3.3 time to a percentage of full cure—measure of cure based on the time to develop some percentage of the difference in torque from the minimum to the maximum. 3.1.3.4 time to incipient cure (scorch time)—measure of thetime at which a specified small increase in torque has occurred; it indicates the beginning of vulcanization. 4. Summary of Test Method 4.1 A rubber test piece is contained in a die cavity which may be closed or almost closed and maintained at an elevated temperature. The cavity is formed by two dies, one of which is oscillated through a small rotary amplitude. This action produces a sinusoidal...