Plasticoid Black Rubber Stoppers Solid 000M290 Pack. Combining top-notch and uncompromising quality with an affordable price the Plasticoid Black Rubber Stoppers Solid 000M290/ 59580-047 can fulfill your laboratory needs while still offering a great value for the money. Product Category Description: These general-purpose stoppers are made of natural rubber and are excellent for use with jars whose tops are too large to fit through the orifices of jars (e.g. jars with wide-mouth openings). To close stamp or otherwise pierce the stoppers stamp a hole in desired location and heat-set them to eliminate any leaking. Natural rubber will not melt contaminate or disintegrate. They will however harden in the liquid state forming an air-tight seal that will prevent any leaking. The high percentage of unfilled cells in all types of stoppers is very low reducing the number of stoppers required for each batch of formulation. Some longer-lasting stoppers such as those for test tubes or jars may be necessary after exposure to certain liquids (e.g. a solvent-contaminated glass stopper for example which would cause the contamination. During manufacturing some stoppers may leak requiring partial or complete replacement. This problem does not appear to pose a problem for users of safety-preventing seals since they are made of rubber and not latex. Before filling stamp or heat-seal the stoppers are compressed air-activated chemically saturated and sanitized. Before use solid stoppers should be placed in a greased pan. After use consult manufacturer recommendations to ensure that the stoppers are properly oriented (pouch rolls) for proper functioning. Specifications for Plasticoid Black Rubber Stoppers Solid 000M290 : Size: 000 Dia. of Top mm: 13 Dia. of Bottom mm: 8 Length mm: 21 No./lb. (Approx.): 181 Unit: Pack (Please note that the description and stock photo may not correspond to the specific model listed above) We offer only genuine Plasticoid products authorized for sale in the U.S. and other markets so you can be sure that you are buying authentic Laboratory Consumables with a full manufacturer's warranty in addition to our own 100percent Satisfaction Guarantee. We are your premier online distributor for Plasticoid Laboratory Consumables. We are an authorized supplier to all federal and state government agencies as well as to research and educational institutions and can facilitate volume orders on many types of laboratory equipment lab consumables and other products to help fulfill your specific needs. We offer Free Shipping and FREE USPS shipping to APO and FPO addresses on all orders in our store over 49. Please refer to our APO/FPO Shipping and Export Restrictions for more information on export to APO/FPO addresses. In addition to the Plasticoid Black Rubber Stoppers Solid 000M290/ 59580-047 we carry a full complement of Laboratory Consumables as well as other product offerings from Plasticoid. We also carry a full line of Plasticoid accessories to help meet your laboratory and scientific needs. For a complete selection of Plasticoid Laboratory Consumables please visit our Plasticoid page. For more brand name Laboratory Consumables please visit our Laboratory Consumables store section. To see our complete line of lab medical industrial and scientific products please see our science and lab equipment online catalog. Plasticoid Black Rubber Stoppers Solid 000M290 Pack