These <b>polystyrene jar foam liner seals</b> coated with <b>torque-activated adhesive</b><br> require no tools and no heat induction equipment. <p> For proper application consider the following recommendations: <p> ● <b>Make sure</b> your pressure sensitive liner size matches the jar opening. <br> These <b>70 mm (2.75 inches) seals</b> are to be used with regular mouth jars<br> that measure 2 3⁄8 in (60 mm) inner and 2 3⁄4 in (70 mm) outer diameter neck size. <p> ● Completely <b>clean the jar top</b> with clean cloth and alcohol to clear of liquid <br> and/or solids. Center jar seal on top of you plastic or glass jar, and apply. The white <br> side of the seal shall be facing down, the side with BLACK letters shall be facing up. <p> ● Screw metal or plastic cap on jar. Make sure the liner and cap are <b>tightly secured</b><br> on the container. <p> ● Once the cap is applied, it should not be removed for <b>at least 24 hours </b><br> to ensure proper adhesion. Although depending on your application, the adhesion<br> process might take significantly less time. <p> ● Seals can be used <b>with glass and plastic jars</b> and with lined or unlined caps.<br> These pressure sensitive liners are <b>best for use with powder or dry products</b>. <p> ● Avoid overfilling your containers! <p> ● Once seal is removed, it cannot be reapplied. <p> ● Not suitable for applications containing oil.