An alternative form of construction using heat sealable material.
It is common practice to create insulation jackets for valves and flanges secured with Velcro and draw cords. Layers of siliconised glass cloth with mineral fibre filling are sewn together. This can lead to leakage through the sewn seams allowing water to build up inside the jacket. This reduces insulating efficacy and can also lead to freezing in low temperatures.
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