ASTM D7149-05 (R2021) pdf free download.Standard Practice for Determining the Freeze Thaw Stability of Adhesives.
1 .1 This practice determines the ability of an adhesive to withstand repeated freezing and thawing cycles at specific temperatures without any significant change in physical properties.
1.2 The values stated in SI units are to he regarded as the standard. The values given in parentheses are for information only.
4. SignifIcance and Use
4.1 This practice will provide a procedure for determining the stability of an adhesive to withstand five repeated cycles, or as otherwise specified, of freezing and thawing at a specific temperature.
4.2 This practice will allow the user to determine whether or not the adhesive can he appropriately applied alter cycling of freezing and thawing.
4.3 This practice will identify any significant changes in the manufactured viscosity of the product after five cycles, or as otherwise specified, of freezing and thawing at a specific temperature.
4.4 This practice will help determine if the pH of adhesive has changed significantly due to the freezing and thawing cycles
5. Apparatus
5.1 A 1.0 L (1 qt) container, or larger, with lid. Other container sizes may be applicable for some adhesives.
5.2 Freezer capable of maintaining -18 ± -2°C (0.0 ± -5°F) to -7 ± -2°C (20 ± -5°F).
5.3 Brookfield RVT Viscometer 1-spindle TC at 5 — 20 rpms, Heliopath stand.
NO’IF 1—Other viscometer models, their speed and spindle size, may be utilized as long as they comply to Test Methods D1084 or D2556 and are recommended by the manufacturer for such use.
5.4 pH meter.
5.5 Tongue depressor or similar.
6. Conditioning
6. 1 Condition the adhesive to be tested 24 h at 23 ± -2°C (73 ± -4°F) with a relative humidity if 50 ± -5 % prior to testing.
7. Procedure
7.1 Fill the container with adhesive to he tested.
7.2 Check the viscosity of the adhesive after it is transferred into the container, as defined in Test Methods D1084 (Method B) or Test Method D2556.
7.3 Check the pH of the adhesive after it is transferred into the container, as defined in Test Method D 1293.ASTM D7149 pdf download.