Standard ground joint stoppers NS 12/21,

Ground joint stopper NS 12/21 is a plastic laboratory stopper for sealing standard conical ground joints of size NS 12/21. Manufactured from low-density polyethylene (LDPE), it features an octagonal grip and a red insert plate that support firm handling and easy recognition on flasks and related glassware. The stopper suits apparatus with matching NS 12/21 joints in general laboratory chemistry, teaching setups and routine sample handling. It is supplied in packs of 100 pieces, with a minimum order quantity of 100 pieces, making it practical for bulk replenishment of plastic Normschliff stoppers. The LDPE body provides a flexible, lightweight closure that seats on the ground joint surface and can be fitted or removed quickly during everyday workflows. The octagonal head improves grip when gloves are worn, while the red insert plate adds visual contrast against clear glass. These PE stoppers from manufacturer Marienfeld offer a straightforward plastic option for laboratories that standardise on NS 12/21 joints and prefer polyethylene over glass stoppers for selected applications. Ideal for organised storage and sealing of ground-joint equipment in this common joint size.

This article is part of Ground-joint glass stoppers, in Stoppers, caps & closures.

Key features

• Pack size: 100 pc(s)
• Product type: Ground joint stopper
• Joint size: NS 12/21
• Material: Low-density polyethylene (LDPE)
• Design: Octagonal grip with red insert plate
• EAN: 4250317313546