Bonded Caps

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 uses Easy Pierce™ technology to combine easy needle penetration with resealability and resistance to evaporation. Septa from other companies may promote analytical purity and limit evaporation, but at the expense of penetration. When resistance to piercing is high, needles can break. Strong resistance can also disrupt autosampler motors. SSP’s Easy Pierce™ balances ease-of-penetration with other application requirements and is available in standard and ultra low bleed versions. 

SSP supplies open-top polypropylene screw caps for 12x32mm vials used with autosamplers, laboratory equipment for automated sample processing. Typically, these vials are made of borosilicate glass. Our standard 9mm open-top PP screw caps are designed to accommodate most 12x32 mm vials. For larger samples a bonded 13-425 cap is available. Our bonded caps can be manufactured with a single slit to allow for venting during the injection process. 

SSP also supplies EPA/VOA bonded caps that meet performance-based specifications from the U.S. Environmental Protection Agency (EPA) for volatile organic analysis (VOA), a series of laboratory techniques for identifying and measuring volatile organic compounds (VOCs). Open-top PP screw caps for EPA/VOA vials have 24-400 or 24-414 thread patterns.    

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). 

See the product tables below for more information about the standard bonded caps that SSP supplies. All our septa 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 custom septa for bonded caps, click any of the Custom Septa buttons below. 

Features

  • Excellent bond between septum and cap
  • Made to order, custom septa available
  • Can be conditioned for ultra-low bleed
  • Strong, soft premium silicone
  • Born-on date on each package

Benefits

  • Septa can’t fall into the vial
  • Reduced handling, less contamination
  • No interfering peaks
  • Easy needle penetration, resealable
  • Easy to control and identify inventory

9mm Open Top PP Screw Caps for 12X32mm vials

  • Description
    Product ID
  • ST883 BND .040” Thick, White PTFE/ Red Silicone Bonded into a 9mm Blue Ribbed Screw Cap. Bags of 100
    1384-9501B-C
  • ST883 BND .040” Thick, White PTFE/ Red Silicone Bonded into a 9mm Blue Ribbed Screw Cap. Bags of 1000
    1384-9501B-M
  • ST2500 BND .040” Thick, Red PTFE/ White easy pierce silicone Bonded into a 9mm Black Ribbed Screw Cap. Bags of 100
    2504-9502B-C
  • ST2500 BND .040” Thick, Red PTFE/ White easy pierce silicone Bonded into a 9mm Black Ribbed Screw Cap. Bags of 1000
    2504-9502B-M
  • ST2500 BND .040” Thick, Red PTFE/ White easy pierce silicone Bonded into a 9mm Green Ribbed Screw Cap. Bags of 100
    2504-9504B-C
  • ST2500 BND .040” Thick, Red PTFE/ White easy pierce silicone Bonded into a 9mm Green Ribbed Screw Cap. Bags of 1000
    2504-9504B-M
  • ST2500 BND .040” Thick, Red PTFE/ White easy pierce silicone Bonded into a 9mm Red Ribbed Screw Cap. Bags of 100
    2504-9503B-C
  • ST2500 BND .040” Thick, Red PTFE/ White easy pierce silicone Bonded into a 9mm Red Ribbed Screw Cap. Bags of 1000
    2504-9503B-M
  • ST2500 BND .040” Thick, Red PTFE/ White easy pierce silicone Bonded into a 9mm Yellow Ribbed Screw Cap. Bags of 100
    2504-9505B-C
  • ST2500 BND .040” Thick, Red PTFE/ White easy pierce silicone Bonded into a 9mm Yellow Ribbed Screw Cap. Bags of 1000
    2504-9505B-M
  • ST2500 BND .040” Thick, Red PTFE/ White easy pierce silicone Bonded into a 9mm Blue Ribbed Screw Cap. Bags of 100
    2504-9501B-C
  • ST2500 BND .040” Thick, Red PTFE/ White easy pierce silicone Bonded into a 9mm Blue Ribbed Screw Cap. Bags of 1000
    2504-9501B-M
  • ST2500-X BND .040" Thick, Slit, Red PTFE/ White easy pierce silicone - Slit Bonded into a 9mm Black Ribbed Screw Cap. Bags of 100
    2504-9502B1-C
  • ST2500-X BND .040" Thick, Slit, Red PTFE/ White easy pierce silicone - Slit Bonded into a 9mm Black Ribbed Screw Cap. Bags of 1000
    2504-9502B1-M
  • ST2500-X BND .040" Thick, Slit, Red PTFE/ White easy pierce silicone - Slit Bonded into a 9mm Blue Ribbed Screw Cap. Bags of 100
    2504-9501B1-C
  • ST2500-X BND .040" Thick, Slit, Red PTFE/ White easy pierce silicone - Slit Bonded into a 9mm Blue Ribbed Screw Cap. Bags of 1000
    2504-9501B1-M
  • ST2500-X BND .040" Thick, Slit, Red PTFE/ White easy pierce silicone - Slit Bonded into a 9mm Green Ribbed Screw Cap. Bags of 100
    2504-9504B1-C
  • ST2500-X BND .040" Thick, Slit, Red PTFE/ White easy pierce silicone - Slit Bonded into a 9mm Green Ribbed Screw Cap. Bags of 1000
    2504-9504B1-M
  • ST2500-X BND .040" Thick, Slit, Red PTFE/ White easy pierce silicone - Slit Bonded into a 9mm Red Ribbed Screw Cap. Bags of 100
    2504-9503B1-C
  • ST2500-X BND .040" Thick, Slit, Red PTFE/ White easy pierce silicone - Slit Bonded into a 9mm Red Ribbed Screw Cap. Bags of 1000
    2504-9503B1-M
  • ST2500-X BND .040" Thick, Slit, Red PTFE/ White easy pierce silicone - Slit Bonded into a 9mm Yellow Ribbed Screw Cap. Bags of 100
    2504-9505B1-C
  • ST2500-X BND .040" Thick, Slit, Red PTFE/ White easy pierce silicone - Slit Bonded into a 9mm Yellow Ribbed Screw Cap. Bags of 1000
    2504-9505B1-M
  • ST2511 BND .040" Thick, Natural PTFE/ White easy pierce silicone - Ultra Low Bleed for GC/MS & LC/MS Bonded into a 9mm Blue Ribbed Screw Cap. Bags of 100
    2534-9501B-C
  • ST2511 BND .040" Thick, Natural PTFE/ White easy pierce silicone - Ultra Low Bleed for GC/MS & LC/MS Bonded into a 9mm Blue Ribbed Screw Cap. Bags of 1000
    2534-9501B-M
  • ST2511 BND .040" Thick, Natural PTFE/ White easy pierce silicone - Ultra Low Bleed for GC/MS & LC/MSBonded into a 9mm Black Ribbed Screw Cap. Bags of 100
    2534-9502B-C
  • ST2511 BND .040" Thick, Natural PTFE/ White easy pierce silicone - Ultra Low Bleed for GC/MS & LC/MSBonded into a 9mm Black Ribbed Screw Cap. Bags of 1000
    2534-9502B-M
  • ST2511 BND .040" Thick, Natural PTFE/ White easy pierce silicone - Ultra Low Bleed for GC/MS & LC/MSBonded into a 9mm Green Ribbed Screw Cap. Bags of 100
    2534-9504B-C
  • ST2511 BND .040" Thick, Natural PTFE/ White easy pierce silicone - Ultra Low Bleed for GC/MS & LC/MSBonded into a 9mm Green Ribbed Screw Cap. Bags of 1000
    2534-9504B-M
  • ST2511 BND .040" Thick, Natural PTFE/ White easy pierce silicone - Ultra Low Bleed for GC/MS & LC/MSBonded into a 9mm Red Ribbed Screw Cap. Bags of 100
    2534-9503B-C
  • ST2511 BND .040" Thick, Natural PTFE/ White easy pierce silicone - Ultra Low Bleed for GC/MS & LC/MSBonded into a 9mm Red Ribbed Screw Cap. Bags of 1000
    2534-9503B-M
  • ST2511 BND .040" Thick, Natural PTFE/ White easy pierce silicone - Ultra Low Bleed for GC/MS & LC/MSBonded into a 9mm Yellow Ribbed Screw Cap. Bags of 100
    2534-9505B-C
  • ST2511 BND .040" Thick, Natural PTFE/ White easy pierce silicone - Ultra Low Bleed for GC/MS & LC/MSBonded into a 9mm Yellow Ribbed Screw Cap. Bags of 1000
    2534-9505B-M
  • ST2511-X BND .040" Thick, Natural PTFE/ White easy pierce silicone - Slit, Ultra Low Bleed for GC/MS & LC/MS Bonded into a 9mm Black Ribbed Screw Cap. Bags of 100
    2534-9502B1-C
  • ST2511-X BND .040" Thick, Natural PTFE/ White easy pierce silicone - Slit, Ultra Low Bleed for GC/MS & LC/MS Bonded into a 9mm Black Ribbed Screw Cap. Bags of 1000
    2534-9502B1-M
  • ST2511-X BND .040" Thick, Natural PTFE/ White easy pierce silicone - Slit, Ultra Low Bleed for GC/MS & LC/MS Bonded into a 9mm Blue Ribbed Screw Cap. Bags of 100
    2534-9501B1-C
  • ST2511-X BND .040" Thick, Natural PTFE/ White easy pierce silicone - Slit, Ultra Low Bleed for GC/MS & LC/MS Bonded into a 9mm Blue Ribbed Screw Cap. Bags of 1000
    2534-9501B1-M
  • ST2511-X BND .040" Thick, Natural PTFE/ White easy pierce silicone - Slit, Ultra Low Bleed for GC/MS & LC/MS Bonded into a 9mm Green Ribbed Screw Cap. Bags of 100
    2534-9504B1-C
  • ST2511-X BND .040" Thick, Natural PTFE/ White easy pierce silicone - Slit, Ultra Low Bleed for GC/MS & LC/MS Bonded into a 9mm Green Ribbed Screw Cap. Bags of 1000
    2534-9504B1-M
  • ST2511-X BND .040" Thick, Natural PTFE/ White easy pierce silicone - Slit, Ultra Low Bleed for GC/MS & LC/MS Bonded into a 9mm Red Ribbed Screw Cap. Bags of 100
    2534-9503B1-C
  • ST2511-X BND .040" Thick, Natural PTFE/ White easy pierce silicone - Slit, Ultra Low Bleed for GC/MS & LC/MS Bonded into a 9mm Red Ribbed Screw Cap. Bags of 1000
    2534-9503B1-M
  • ST2511-X BND .040" Thick, Natural PTFE/ White easy pierce silicone - Slit, Ultra Low Bleed for GC/MS & LC/MS Bonded into a 9mm Yellow Ribbed Screw Cap. Bags of 100
    2534-9505B1-C
  • ST2511-X BND .040" Thick, Natural PTFE/ White easy pierce silicone - Slit, Ultra Low Bleed for GC/MS & LC/MS Bonded into a 9mm Yellow Ribbed Screw Cap. Bags of 1000
    2534-9505B1-M
  • ST522B-X BND .040" Thick, Blue PTFE/ White Silicone - Slit Bonded into a 9mm Black Ribbed Screw Cap. Bags of 100
    1154-9502B1-C
  • ST522B-X BND .040" Thick, Blue PTFE/ White Silicone - Slit Bonded into a 9mm Black Ribbed Screw Cap. Bags of 1000
    1154-9502B1-M
  • ST522B-X BND .040" Thick, Blue PTFE/ White Silicone - Slit Bonded into a 9mm Black Ribbed Screw Cap. Bags of 1000
    1154-9503B-M
  • ST522B-X BND .040" Thick, Blue PTFE/ White Silicone - Slit Bonded into a 9mm Blue Ribbed Screw Cap. Bags of 100
    1154-9501B1-C
  • ST522B-X BND .040" Thick, Blue PTFE/ White Silicone - Slit Bonded into a 9mm Blue Ribbed Screw Cap. Bags of 1000
    1154-9501B1-M
  • ST522B-X BND .040" Thick, Blue PTFE/ White Silicone - Slit Bonded into a 9mm Green Ribbed Screw Cap. Bags of 100
    1154-9504B1-C
  • ST522B-X BND .040" Thick, Blue PTFE/ White Silicone - Slit Bonded into a 9mm Green Ribbed Screw Cap. Bags of 1000
    1154-9504B1-M
  • ST522B-X BND .040" Thick, Blue PTFE/ White Silicone - Slit Bonded into a 9mm Red Ribbed Screw Cap. Bags of 100
    1154-9503B1-C
  • ST522B-X BND .040" Thick, Blue PTFE/ White Silicone - Slit Bonded into a 9mm Red Ribbed Screw Cap. Bags of 1000
    1154-9503B1-M
  • ST522B-X BND .040" Thick, Blue PTFE/ White Silicone - Slit Bonded into a 9mm Yellow Ribbed Screw Cap. Bags of 100
    1154-9505B1-M
  • ST522B-X BND .040" Thick, Blue PTFE/ White Silicone - Slit Bonded into a 9mm Yellow Ribbed Screw Cap. Bags of 1000
    1154-9505B1-M
  • ST883 BND .040” Thick, White PTFE/ Red Silicone Bonded into a 9mm Yellow Ribbed Screw Cap. Bags of 100
    1384-9505B-C
  • ST883 BND .040” Thick, White PTFE/ Red Silicone Bonded into a 9mm Yellow Ribbed Screw Cap. Bags of 1000
    1384-9505B-M
  • ST883 BND .040” Thick, White PTFE/ Red Silicone Bonded into a 9mm Black Ribbed Screw Cap. Bags of 100
    1384-9502B-C
  • ST883 BND .040” Thick, White PTFE/ Red Silicone Bonded into a 9mm Black Ribbed Screw Cap. Bags of 1000
    1384-9502B-M
  • ST883 BND .040” Thick, White PTFE/ Red Silicone Bonded into a 9mm Green Ribbed Screw Cap. Bags of 100
    1384-9504B-C
  • ST883 BND .040” Thick, White PTFE/ Red Silicone Bonded into a 9mm Green Ribbed Screw Cap. Bags of 1000
    1384-9504B-M
  • ST883 BND .040” Thick, White PTFE/ Red Silicone Bonded into a 9mm Red Ribbed Screw Cap. Bags of 100
    1384-9503B-C
  • ST883 BND .040” Thick, White PTFE/ Red Silicone Bonded into a 9mm Red Ribbed Screw Cap. Bags of 1000
    1384-9503B-M

13-425 Open Top PP Screw Caps for 12X32mm vials

  • Description
    Product ID
  • ST2500 BND .060" Thick, Red PTFE/ White easy pierce silicone Bonded into a Black 13-425 Screw Cap. Bags of 100
    2506-1302B-C
  • ST2500 BND .060" Thick, Red PTFE/ White easy pierce silicone Bonded into a Black 13-425 Screw Cap. Bags of 1000
    2506-1302B-M
  • ST2500-X BND .060” Thick, Red PTFE/ White easy pierce silicone - Slit Bonded into a Black 13-425 Screw Cap. Bags of 100
    2506-1302B1-C
  • ST2500-X BND .060” Thick, Red PTFE/ White easy pierce silicone - Slit Bonded into a Black 13-425 Screw Cap. Bags of 1000
    2506-1302B1-M

24-400 Open Top PP Screw Caps for EPA/VOA Vials

  • Description
    Product ID
  • ST2060 .125” Thick, Natural PTFE/ Clear Extreme Ultra Low Bleed Silicone Bonded into a White 24-400 Open Top Screw Cap in Bags of 100
    0700-2610B-C
  • ST2060 .125” Thick, Natural PTFE/ Clear Extreme Ultra Low Bleed Silicone Bonded into a White 24-400 Open Top Screw Cap in Bags of 1000
    0700-2610B-M

24-414 Open Top PP Screw Caps for EPA/VOA Vials

  • Description
    Product ID
  • ST12060 .060” Thick, Natural PTFE/ Clear Silicone Bonded into a White 24-414 Open Top Screw Cap in Bags of 100
    0706-2410B-C
  • ST2060 .125” Thick, Natural PTFE/ Clear Extreme Ultra Low Bleed Silicone Bonded into a White 24-414 Open Top Screw Cap in Bags of 100
    0700-2410B-C
  • ST2060 .125” Thick, Natural PTFE/ Clear Extreme Ultra Low Bleed Silicone Bonded into a White 24-414 Open Top Screw Cap in Bags of 1000
    0700-2410B-M
  • ST2078 .125” Thick, Natural PTFE/ Clear Ultra Low Bleed Silicone Bonded into a White 24-414 Open Top Screw Cap in Bags of 100
    0720-2410B-C

News

Ultra-low bleed silicones for septa promote analytical purity and prevent ghost peaks on chromatographs. To avoid septum bleed, Specialty Silicone [...]

Contact Us

SSP Companies
Corporate Technology Park, 3 McCrea Hill Road
Ballston Spa, NY 12020

Toll Free: (800) 437-1442
Ph: (518) 885-8826

Custom Septa

SeptaSource.com has one of the largest ranges of dies, molds, caps and silicone formulations to create just about any septa or septa/cap combination imaginable. Use the simple Custom Septa Selector and send your request to us and we will get back to you.