Black phenolic cap has a securely mounted LDPE cone-shaped liner which offers a two part seal. The closure forms a seal around the rim and the polyseal cone forms a seal against the inner diameter of the vial opening.

• Designed for superior torque retention
• Stress crack resistant
• Excellent for sample storage and re-sealing
• Identified in ASTM Specification E982, Class A requirements
• Continuous knurling