NW40 Replacement O'Rings
NW40 (KF40, QF40) Series Replacement O-Ring

• Replacement Elastomer Seals

Buna-N (Nitrile, NBR): 100°C Maximum
Viton (Fluorocarbon, FKM): 200°C Maximum
Silicone (Chemical Series): 200°C Maximum

Fits NW40 (KF40, QF40) Series Centering Rings
Fits NW32 to NW40 Adaptive Centering Ring

NW40 Buna-N O-Ring <br> (NW40-150-OB)
NW40 Buna-N O-Rings <br> (NW40-150-OB10)
NW40 Buna-N O-Ring

Price: $4.05
Sale: $1.00
NW40 Buna-N O-Rings

10 Pack
Price: $40.50
Sale: $9.00
NW40 Silicone O-Ring <br> (NW40-150-OS)
NW40 Silicone O-Rings <br> (NW40-150-OS10)
NW40 Silicone O-Ring

Price: $16.10
Sale: $2.00
NW40 Silicone O-Rings

10 Pack
Price: $161.00
Sale: $16.00
NW40 Viton O-Ring <br>  (NW40-150-OV)
NW40 Viton O-Rings <br> (NW40-150-OV10)
NW40 Viton O-Ring

Price: $8.80
Sale: $3.00
NW40 Viton O-Rings

10 Pack
Price: $88.00
Sale: $24.00
Click to enlarge
Click to enlarge
NW40 Centering Rings

NW40 HNBR O-Ring

Click to enlarge
All NW40 Hardware

Viton® (Fluorocarbon) O-Ring:
200°C Maximum
• Viton® (Fluorocarbon, FKM)
is normally used in vacuum service. Viton® has a low porosity to most gases and withstands high temperatures up to 200°C for short periods.

Silicone O-Rings:
200°C Maximum, Chemical Applications
• Silicone
is used in chemical applications and can withstand temperatures of 200°C for short periods, but silicone tends to harden to prolonged high temperature service, sticking to the metal surfaces and making the o-ring difficult to be replaced. Silicone is also very porous to helium.

Buna-N O-Rings:
100°C Maximum
• Buna-N
is low cost, but their maximum operating temperature of 100°C makes them unacceptable for many high temperature vacuum applications.

Contact LDS Vacuum with any questions:
Phone (407)862-4643 via Fax (407)862-8723 or

LDS Vacuum Products is a 100% woman owned company and
certified Woman Owned Small Business (WOSB)
The logos and/or trademarks appearing on this page are not owned by or registered to LDS but, rather, designate products sold by LDS, and are owned and/or registered to the manufacturers or suppliers of the products.
Viton® is a registered trademark of DuPont Dow Elastomers