BS EN ISO 4895:2014 pdf free

BS EN ISO 4895:2014 pdf free.Plastics一Liquid epoxy resins一Determination of tendency to crystallize
This International Standard specifies a method for determining the tendency of liquid epoxy resins to crystallize. The tendency to crystallize is determined by observing, at specified time intervals, changes in fluidity and the onset of crystallization.
The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
ISO 6353-2:1983, Reagents for chemical analysis一Part 2: Specifications一First series
ISO 6353-3:1987, Reagents for chemical analysis一Part 3: Specifications一Second series
Calcium carbonate powder is mixed with the liquid epoxy resin dissolved in ethanol. The mixture is kept at a specified low temperature and observed at specified time intervals to compare the changes in fluidity and crystallization.
Cool the test tube to room temperature [(23±5)°C] in the constant temperature room (5.6), add 20 g of calcium carbonate (4.1) and 2 g of ethanol (4.2), and mix the sample thoroughly with the glass rod for 2 min.
Stopper the test tube again and place it in the vertical position in the refrigerator or cold enclosure (5.1) at(10±2) °C.
Observe the sample twice a day at a specified time (for example at an interval of 8 h during the day and 16 h during the night):
to start at 9 am;
一to carry out first observation at 5 pm;
一to carry out second observation at 9 am (next day);
一to carry out third observation at 5 pm (next day);
一to carry out fourth observation at 9 am (the day after).
Observe the sample in the following way.
Allow the test tube to warm to room temperature [(23±5) °C]in the constant temperature room (5.6), then place it in the horizontal position and leave it for 1 min.
一When the distance of movement of the liquid surface tip (Lin Figure 1) is 10 mm and more, record”a”.
一When the distance of movement of the liquid surface tip (Lin Figure 1) is less than 10 mm, record “b”.
一When the sample has completely solidified due to crystallization, record”c”.BS EN ISO 4895 pdf download.