Flame-Retardant Silicone Sealant E221 is one-component, has excellent weathering resistance, aging resistance,ultraviolet resistance, ozone resistance, and water resistance: excellent flame retardant performance, reaching UL94/-0; no dense smoke will be emitted during combustion Or toxic gas; excellent adhesion, forming strong adhesion with most materials after curing; easy to use, with good extrudability and thixotropy in the temperature range of 4℃ to 40℃, squeeze the glue Direct construction can be done.