RS 136 is a one component, non-combustible ASTM E-136 fireblock, draft stop caulk. Note: RS 136 is water soluble and is not for underwater or exterior use. Not for use in continuous vibration environments. Do not dilute. Store between 35 deg F and 100 deg F to obtain minimum two years shelf life. Best if protected from freezing. If freezing occurs, thaw completely before use. May be used as a smoke seal. Before using as a smoke seal check local authority for approval.