Silicone Septa – My Site https://www.ptfe-fabrics.com High performance PTFE & Silicone coated fabric Fri, 19 Sep 2025 13:37:02 +0000 en-US hourly 1 https://wordpress.org/?v=6.9.4 https://www.ptfe-fabrics.com/wp-content/uploads/2018/08/cropped-0IKA_MVZJ6J@RQUCB5-32x32.png Silicone Septa – My Site https://www.ptfe-fabrics.com 32 32 PTFE Silicone Septa Vial Sealing Materials https://www.ptfe-fabrics.com/ptfe-silicone-septa/ https://www.ptfe-fabrics.com/ptfe-silicone-septa/#respond Wed, 17 Sep 2025 20:15:31 +0000 https://www.ptfe-fabrics.com/?p=15567 PTFE Silicone Septa Vial Sealing Materials PTFE Silicone Septa In pharmaceutical, life science, and analytical laboratories, vial sealing materials play a critical role in ensuring sample integrity and maintaining the accuracy of experimental results. ESONE PTFE/Silicone composite septa are high-performance sealing materials specifically developed to meet these stringent requirements. Key Features [...]

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PTFE Silicone Septa Vial Sealing Materials

PTFE Silicone Septa Vial Sealing Materials

PTFE Silicone Septa

In pharmaceutical, life science, and analytical laboratories, vial sealing materials play a critical role in ensuring sample integrity and maintaining the accuracy of experimental results. ESONE PTFE/Silicone composite septa are high-performance sealing materials specifically developed to meet these stringent requirements.

Key Features of PTFE Silicone Septa

  • Excellent resealability: Maintains a tight seal even after multiple punctures.
  • High PTFE/silicone bond strength: Long-term stability without delamination.
  • Broad temperature resistance: -40 °C to +220 °C(-40 °F 到 428 °F), suitable for cold-chain and high-temperature environments.
  • Outstanding chemical resistance: Compatible with a wide range of solvents and reagents.
  • Consistent silicone hardness (durometer): Ensures controlled needle penetration and enhances product durability.

Structure and Working Principle of PTFE Silicone Laminates

ESONE septa feature a two-layer composite construction:

  • PTFE film layer: Provides excellent chemical inertness and outstanding resistance to a wide range of solvents and reagents. By creating a highly stable barrier, the PTFE surface prevents leaching of impurities and protects sensitive samples from degradation. This ensures that the vial contents remain uncontaminated and chemically intact, making it particularly valuable for critical applications such as pharmaceutical formulations, chromatography, and high-purity analytical testing.

For PTFE, the characteristic peaks in the approximately 1150 and 1205 cm-1

PTFE film layer For PTFE silicone septa
  • Silicone elastomer layer: Delivers outstanding elasticity and resealability. After syringe penetration, the septa reseal immediately, maintaining vial integrity.

This unique structure offers a robust chemical barrier while enabling reliable resealing during multiple sampling operations.

For Silicone, typical FTIR spectra corresponding to a C-H band for Si-CH3 at 1255 cm-1, Si-O-Si band at 1092 and 1023 cm-1, Si-C from Si-CH3 at 864 and C-H (CH3) at 800 cm-1.

Silicone elastomer layer For PTFE silicone septa

Key Features of PTFE Silicone Septa

  • Excellent resealability: Maintains a tight seal even after multiple punctures.
  • High PTFE/silicone bond strength: Long-term stability without delamination.
  • Broad temperature resistance: -40 °C to +220 °C(-40 °F 到 428 °F), suitable for cold-chain and high-temperature environments.
  • Outstanding chemical resistance: Compatible with a wide range of solvents and reagents.
  • Consistent silicone hardness (durometer): Ensures controlled needle penetration and enhances product durability.
PTFE Silicone Septa
PTFE Silicone Rubber Laminated Septum

Applications of PTFE silicone Rubber Septa

  • Pharmaceutical and life sciences: Secure vial sealing to prevent external contamination.
  • Chromatographic research (GC, HPLC, MS): Low background noise and extractables, ensuring accurate test results.
  • Scientific and industrial experiments: Suitable for environments demanding purity and high chemical resistance.

TDS of PTFE/Silicone Septa Sealing Material

Model NameFilm Thickness
mm(mil)		Silicone Thickness
mm(mil)		Tensile Strength
MPa		Silicone Hardness
Shore A		ColorDescription
ESLAM SEP10.075(3)0.5(20)630, 40Red/WhitePTFE Film/Silicone Rubber
ESLAM SEP20.075(3)1.0(40)630, 40Red/WhitePTFE Film/Silicone Rubber
ESLAM SEP30.13(5)1.0(40)630, 40Red/WhitePTFE Film/Silicone Rubber
ESLAM SEP40.13(5)3.0(120)630, 40Red/WhitePTFE Film/Silicone Rubber

ESONE cap liner can also use PTFE film laminated with PE Foam

TDS of PTFE/PE Foam Septa Sealing Material

ProductsPTFE Thickness
(mm)		Total Thickness
(mm)		Max Width
(mm)		Foam Density
g/cc
PTFE Film + PE Foam + PTFE Film0.05-0.131-310000.3-0.6
PTFE Film + PE Foam + PE Film0.05-0.131-310000.3-0.6

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