These test methods may be used to determine the subnormal temperature stiffening of flexible polymers or fabrics coated with flexible polymers. Temperatures at which the low temperature modulus is a specified multiple or ratio of the modulus at room temperature are interpolated from the twist versus temperature curve. These specified ratios of low-temperature modulus to room-temperature modulus are called relative moduli. These temperatures at the relative moduli encompass the transition region between the glassy and rubbery states of the materials tested.

These test methods offer only a general guide to stiffness characterization as service conditions of experimental materials may differ greatly from the test conditions.

A Torsion head	G Movable protractor
B Torsion wire	H Supporting stand
C Sieve	I Specimen rack
D Clamp stud	J Test specimen
E Screw connector	K Bottom clamp
F Pointer	L Top clamp

1. Scope

1.1 These test methods describe the use of a torsional apparatus for measuring the relative low temperature stiffening of flexible polymeric materials and fabrics coated therewith. A routine inspection and acceptance procedure, to be used as a pass-fail test at a specified temperature, is also described.

1.2 These test methods yield comparative data to assess the low temperature performance of flexible polymers and fabrics coated therewith.

1.3 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only.

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 (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.

ASTM Standards

Keywords

apparent modulus of rigidity; coated fabric; fabrics; flexible polymers; low temperature; low temperature modulus; low temperature test; modulus proportionality factor; MPF; polymer; relative modulus; rigidity modulus; stiffening ; stiffness; stiffness measurement in gaseous media; stiffness measurement in liquid media; subnormal temperature; torsion; twist versus temperature;

ICS Code

ICS Number Code 83.060 (Rubber)

Citing ASTM Standards

[Back to Top]