Bottle Septa

• Standard quality for HPLC
• Good reclosure properties for multiple injections
• Relatively inexpensive
• Temperature resistant from -40 ° C to 120 ° C
• Not very clean as a natural product
• Punching discs (punched from sheet / roll material

• NEW standard quality for HPLC and GC
• Synthetic rubber, cleaner and softer than natural rubber
• Relatively inexpensive
• Temperature resistant from -40 ° C to 110 ° C
• Punching discs (punched from sheet / roll material)

• In the absence of a PTFE coating, only for uncritical analyzes
• Butyl as a synthetic rubber cleaner than natural rubber
• Very cheap as there is no PTFE coating
• Application examples: breweries, blood alcohol analyzes
• Original Butyl stopper for PerkinElmer
• Forming discs (vulcanized and formed in a mold)

• Specialty: Pharma-Fix washer only centric PTFE-coated butyl disc; The elastic butyl lying on the glass edge achieves a significantly better seal than the slippery surface of a completely laminated sealing disc
• Butyl as a synthetic rubber cleaner than natural rubber
• Relatively inexpensive compared to silicone
• Temperature resistant from -40 ° C to 120 ° C
• Synthetic rubber has poorer reclosure properties than natural rubber
• Forming discs (vulcanized and formed in a mold)

• Silicone is the purest synthetic elastomer and is therefore used for critical analyzes
• Temperature resistant from -60 ° C to 200 ° C
• Improved reclosure properties than NK / TEF as a synthetic elastomer
• (segmented) septa in HPLC as penetration aids for thick / blunt needles and for producing a valve effect in the case of multiple injections
• Specialty: PTFE-coated silicone washers on both sides for low particle formation
• punching discs (punched from sheet / roll material)

• All chemical and physical properties, such as silicone / PTFE
• However, slightly higher temperature resistance from -60 ° C to 220 ° C
• Frequently on PerkinElmer devices
• More expensive than PTFE-coated septa

• Very inert, therefore also as a coating on most other sealing discs
• No elastomer
-> No sealing
-> No reclosing properties
• Do not press-fit into caps; Are therefore often only sold unassembled
• Very cheap
• Only for very uncritical applications
• Are often used on VWR (Merck) / Hitachi and Waters instruments