These lab-grade cork stoppers are size 9. Size 9 stopper is approximately 9/8 inches tall, 59/64 inches in diameter, and 47/64 inches bottom diameter. They are sold in a pack of 100 stoppers.These lab-grade cork stoppers are size 9. Size 9 stopper is approximately 9/8 inches tall, 59/64 inches in diameter, and 47/64 inches bottom diameter. They are sold in a pack of 100 stoppers.The natural cork has imperfections including holes. Sealing Test Tubes and Flasks: Use cork stoppers to securely close test tubes, flasks, or other glassware during experiments to prevent spills and evaporation.The cork is safe for use with food products. Density Experiments: Use cork stoppers as floating objects to demonstrate buoyancy and density in water. Lab grade cork stoppers will have natural imperfections and holes. Porosity – Natural cork is slightly porous, allowing limited airflow, while synthetic cork offers a more airtight seal.DIY Lab Equipment: Cork stoppers can be modified to hold thermometers, pipettes, or glass tubing, making them essential for custom lab setups.
PRODUCT WARNINGS
WARNING: This product can expose you to chemicals including styrene and lead, which are known to
the State of California to cause cancer, birth defects, or other reproductive harm. For more information go
to www.P65Warnings.ca.gov.
Our products are not toys. Use in a laboratory or educational setting only. Not for children 13 and under.
This product consists of small balls, making it a choking hazard. Only use with adult supervision.