KF O-ring with the material of Viton,NBR ,Silicone

O'ring with Centering ring & Outering ring are used together to seal between pipes, they are widely used in high vacuum systems.

Material:	Silicone Rubber
Hardness Range:	50-90 degrees
Temperature Range:	-100°C to 300°C

Cart

Product Introduction

Viton O'ring are normaly used in vacuum service in place of NBR and silicone rubber.

Viton has a low porosity to most gases (except helium)and withstands high temperature (up to 200°C)

NBR O'ring are low cost,but their maximum operating temperature(approx.100°C)makes them unacceptable for many vacuum applications.

Silicone O'ring can withstand temperatures of 250°C for short periods, but silicone tends to harden to prolonged high temperature service, sticking to the metal surface and making the O'ring difficult to replaced.Silicone is also very porous to helium.

Specification

Material	Hardness Range	Temperature Range	Main Properties
Silicone Rubber	50-90 degrees	-100°C to 300°C	Resistant to high temperatures, resistant to low temperatures, good electrical insulation, strong chemical inertia
NBR	60-90 degrees	-35°C to 120°C	Oil-resistant, wear-resistant, and oxidation-resistant, it is not suitable for acidic, alkaline, and high-temperature environments.
Viton	55-85 degrees	-20°C to 230°C	Resistant to high temperatures, oil, high vacuum, acids and alkalis, and various chemicals

* Color can be customized upon customer’s requirements.

* the Material of Viton,NBR, Silicone can be choose from.

Product parameters

Model No.	Match Center ring Size	Material C/R	Material O'ring	O'ring Size
KF10CRVS	KF10	304.S.S	Viton	AS-311
KF16CRVS	KF16	304.S.S	Viton	AS-314
KF25CRVS	KF25	304.S.S	Viton	AS-320
KF40CRVS	KF40	304.S.S	Viton	AS-326
KF50CRVS	NW50	304.S.S	Viton	AS-330
KF10CRVA	KF10	AL	Viton	AS-311
KF16CRVA	KF16	AL	Viton	AS-314
KF25CRVA	KF25	AL	Viton	AS-320
KF40CRVA	KF40	AL	Viton	AS-326
KF50CRVA	NW50	AL	Viton	AS-330
KF10CRNS	KF10	304.S.S	NBR	AS-311
KF16CRNS	KF16	304.S.S	NBR	AS-314
KF25CRNS	KF25	304.S.S	NBR	AS-320
KF40CRNS	KF40	304.S.S	NBR	AS-326
KF50CRNS	NW50	304.S.S	NBR	AS-330
KF10CRNA	KF10	AL	NBR	AS-311
KF16CRNA	KF16	AL	NBR	AS-314
KF25CRNS	KF25	AL	NBR	AS-320
KF40CRNA	KF40	AL	NBR	AS-326
KF50CRNA	NW50	AL	NBR	AS-330

Recommended Products

KF16,KF25,KF40

KF adapter centering ring with Viton O'ring

Standard:	KF Standard
Brand	RUIJIA
Helium Leak Test:	1x10 -9 Pa · m³/sec or less

KF16,KF25,KF40,KF50

KF Vacuum centering Ring with outing ring & O-ring, Stainless steel,Seal material Viton,Silicone,Buna-N seal

Standard:	KF Standard
Brand	Rujia
Helium Leak Test:	1x10 -9 Pa · m³/sec or less

KF16-KF160

KF Vacuum Meshed Centering Ring

Standard:	KF Standard
Helium Leak Test:	1x10 -9 Pa · m³/sec or less

Related Information

Understanding ISO-K vs ISO-F Vacuum Flanges

Confused about the difference between ISO-K and ISO-F quick-release vacuum connections? Learn when to use KF (Klein Flan...

2026-07-03

How KF Flanges Achieve Vacuum Sealing

Discover how the KF flange system creates reliable vacuum seals through its O-ring and clamp design. Learn installation ...

2026-06-25

KF Fittings: Elbows, Tees, Crosses Explained

Struggling to choose between KF elbows, tees, and crosses for your vacuum setup? Learn how each fitting affects conducta...

2026-06-17

Eco‑Friendly KF Seals: Viton vs Silicone

Evaluating O‑ring materials for quick‑release vacuum joints? We compare Viton and silicone on outgassing, chemical resis...

2026-06-11

After-Sales Service

We have a modern stock management system and professional after-sales service team.

Rich stock, fast delivery

Quick response within 24h

Quality assurance

Accessory replacement

Inquiry Basket()

GET A QUOTE