Genuine Loctite 5188 Gasket Form Ultra, identified by part number 3101300829, is a high-performance anaerobic gasket sealant specifically engineered for sealing rigid metal flanges. This 0.05 L (50ml) red sealant is highly effective on both active metals like steel and iron, and passive materials such as aluminum. It delivers excellent oil resistance and good glycol resistance, operating efficiently within a temperature range of -55°C to +150°C and capable of filling gaps up to 0.25 mm. This product is ideal for demanding industrial and machinery applications requiring a durable and reliable flange seal.