Septa, 20 mm, molded butyl/PTFE

LABSOLUTE®

Description Hardness Thickness mm PK
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Purchase order number
7616892
Cat. No. Description Hardness Thickness mm PK

11

6204824 Silicone white / aluminium foil silver 50° shore A 3.0 1000

12

7615551 Butyl injection stopper grey 1000

1

7616891 Butyl dark grey 55° shore A 3.0 1000

2

7616892 Butyl / PTFE grey 50° shore A 3.0 1000

7

7616893 Silicone blue transparent / PTFE white 45° shore A 3.0 1000

10

7616894 Silicone white / PTFE beige, IM quality 45° shore A 3.2 1000

3

7621812 Butyl / PTFE grey, Pharma-Fix 50° shore A 3.0 1000
7646878 Butyl red / PTFE grey 55° shore A 1.3 100
7648633 Silicone blue transparent / PTFE transparent 45° shore A 3.0 100

5

7669531 Butyl red / PTFE grey 55° shore A 1.3 1000

9

7669532 Silicone blue transparent / PTFE transparent 45° shore A 3.0 1000

The choice of the right septa depends on the application. Many septa are PTFE coated on one side. PTFE is highly resistant against many chemicals and forms an inert border between the sample and the base material of the septa.

The septa's base material has various physical and chemical properties, like temperature resistance, resealability, cleanliness, hardness and thickness.

Natural rubber/TEF

  • Temperature-resistant from -40 °C to 120 °C
  • Excellent resealability properties
  • Inexpensive for standard applications in the fields of GC and HPLC

RedRubber/PTFE
  • Temperature-resistant from -30 °C to 110 °C
  • Softer and therefore easier to penetrate than natural rubber
  • Not as good resealability properties as natural rubber
  • Higher chemical purity than natural rubber
  • Inexpensive for standard applications in the fields of GC and HPLC

Butyl/PTFE
  • Temperature-resistant from -40 °C to 120 °C
  • Higher chemical purity than natural rubber and RedRubber

Silicone/PTFE
  • Temperature-resistant from -60 °C to 200 °C
  • More suitable for single-injection applications
  • Much higher chemical purity than natural rubber and RedRubber
  • Very low particle formation during penetration in case of double-sided PTFE coating
  • Best for the thin and fragile needles of the autosampler
  • Best for critical analysis (UltraClean quality)

Accessories
Without septa