Heat Shrink Tubing: Single Wall Heat Shrink - Black: Single wall polyolefin has a shrink ratio of 2:1 and is very flexible . Typically used as a light-duty shrink-fit installation over cable splices and terminals . Operating temperature: -45°C to +125°C . Shrink temperature: 120°C . Available in 8 colours and several packaging configurations . Contact Techspan if you require lengths not shown. Heat Shrink Tubing: Prolongs the life of cables, connectors and connections by sealing and protecting against corrosion, fuel, grease, oil, salt & road contaminants, water and other acids and chemicals Protects against abrasion by providing additional strain relief in connections . Long heavy-gauge cable can fail due to the stress caused by high and constant vibration Helps identify positive and negative polarity, as well as industry colour coding . Use black tubing on negative () connections and red tubing on positive (+) connections.