PhaseCore Cooling Vests
Heat-activated PhaseCore Cooling Vests absorb heat and provide a long-lasting cooling effect that will not overcool the body. The gentle cooling effect of PhaseCore will help to increase productivity while reducing heat-related illnesses. PhaseCore is a phase change material (PCM) that produces a cooling effect by transforming from a solid state to a liquid state when the surrounding temperature rises above its activation point. PhaseCore Cooling Vests elements are available in a variety of activation points with PhaseCore 28 and PhaseCore 32 designed for personal cooling. PhaseCore cooling vests can be worn while suiting up, whilst down range, and during rehabilitation to avoid extreme temperature changes. PhaseCore elements are made of a non-toxic, non-flammable salt mixture and sealed inside a thermal wrapper. PhaseCore elements are not effected by humidity and react only to direct heat. PhaseCore is simple, safe, and reusable.
Effects of Temperature on the Human Body
The normal human body’s skin temperature is approximately 33°C and the comfort zone is between 28°C and 37.8°C. When skin temperature rises above 37.8°C, the body enters the heat hazard zone and a person may experience heat-related illnesses. A person’s body temperature will rise when working in hot environments, during physical activity, and when wearing protective clothing. PhaseCore helps the body cool and maintain its normal temperature in hot environments by absorbing body heat. When heat is absorbed, the PhaseCore element provides a comfortable and soothing cooling effect. Unlike ice, gel, and other frozen liquids, PhaseCore does not overcool or shock the body, which can constrict a person’s blood flow causing physical discomfort and mobility restriction.
Tests completed in a hot environment prove that PhaseCore technology is effective in helping to combat the rise in a person’s body temperature. Data shows that an individual wearing a SWEDE Cooling Vest with PhaseCore 28 experienced only a 2°C rise in body surface temperature while an individual without a PhaseCore Cooling Vest experienced a 7°C rise in body temperature. Vests can be effective for up to three (Standard Vests) or four (SWEDE Vests) hours; actual time varies based on physical activity, body type, and the environmental conditions.
PhaseCore 28 vs. PhaseCore 32
PhaseCore 28 and PhaseCore 32 both use the same PhaseCore technology to produce a cooling effect – the only difference is their activation points. PhaseCore 28 activates at 28°C and PhaseCore 32 activates at 32°C. Because PhaseCore 28 has a lower activation point, the cooling effect is stronger but lasts for a shorter period of time. PhaseCore 32 has a higher activation point and the cooling effect is less obvious, but sustainable over longer periods of time. Generally, it is recommended that people use PhaseCore 28 elements in temperatures less than 43°C and PhaseCore 32 elements in environments greater than 43°C for a prolonged period of time.
Once PhaseCore elements transform from a solid state to a liquid state, the elements must be recharged, which is done by storing the elements in an environment cooler than their activation points. PhaseCore elements can be recharged more quickly in colder environments. Therefore, refrigeration is not required, but will shorten the recharge period. PhaseCore elements are completely recharged when they return to a solid state.