Significance and Use
5.1 General Utility:
5.1.1 This practice is suitable for research, quality control, specification testing and process control.
5.1.2 It is useful to define and verify the reactivity of non-foam polyurethane formulations.
5.2.1 Operator-to-operator variability and lab-to-lab variability can be significant.
5.2.2 The variability of this practice is dependent on the equipment used to measure the gel time. It is recommended that the testing laboratory and the client agree on the equipment and the conditions to be used that include the following:
188.8.131.52 Gel Tester and gel point criteria,
184.108.40.206 Speed/rpm of the mixer,
220.127.116.11 Type and shape of the mix blades,
18.104.22.168 Size and type (for example, shape, lined or unlined) of container for mixing the components and for measuring the gel time, and
22.214.171.124 The volume (or height) of material to be placed in the container for measuring the gel time and the depth of the measuring wire or spindle of the gel tester from the bottom of the container.
5.2.3 The estimation of precision in this practice is very limited. Users of this practice shall develop their own precision data to determine if these procedures meet their requirements.
5.2.4 It is possible that low-levels (ppm, ppb) of contaminants will not be detected using this practice.
1.1 This practice covers procedures for determining the gel times of polyurethane non-foam formulations using commercially available gel test equipment.
1.2 Definitions, terms, and techniques are described along with procedures for calculating sample weights.
1.3 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.
1.4 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 known ISO equivalent to this standard.
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