IN­SU­LA­TION PER­FOR­MANCE TEST

Trail (UK) - - CHOOSE THE RIGHT... INSULATED FLASK -

To test how well each flask re­tained heat, we firstly primed each flask for 5 min­utes with boil­ing wa­ter. We then filled each flask with freshly boiled wa­ter. We al­lowed some ini­tial cool­ing to take place for a minute or two un­til each flask con­tained wa­ter at 90°C. We then fit­ted the screw tops and cups, if pro­vided, and re-opened the flasks af­ter three-, six- and nine-hour in­ter­vals. Dur­ing the test the am­bi­ent air tem­per­a­ture was 18°C and there was no wind. The flasks were rested on a ta­ble and not in­su­lated by cloth­ing in a ruck­sack, as this could cre­ate a wide vari­a­tion in per­for­mance.

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