Bonded caps from Specialty Silicone Products (SSP) are made of polypropylene (PP) plastic and bonded to platinum-cured silicone septa that’s easy-to-pierce. To ensure analytical purity, SSP uses a proprietary bonding technology that maintains the septum’s analytical properties. In other words, our bonding process won’t add contaminants that can leach from the cap-and-septa assembly into your laboratory samples. 

SSP supplies bonded septum in the following polypropylene caps:

• 9mm screw
• 13-425 screw
• 24-400 screw
• 24-414 screw

Our bonded caps can be manufactured with a single slit to allow for venting during the injection process. 

With our proprietary bonding technology, SSP can bond silicone/PTFE septa to PP screw caps for almost any application with gas chromatography (GC) or liquid chromatography (LC) and mass spectrometry (MS). 

All our bonded septa caps are made in the USA at our Ballston Spa, New York facility. These ribbed screw caps come in different colors and are supplied in bags of 100 or 1000. If you need a custom bonded septa cap, click here and let us know what you are looking for.