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NW40 Mesh Screen Centering Rings

NW40 Mesh Screen Centering Rings
• NW40 (KF40, QF40) Series
• Centering Rings with Screen (304 Stainless)

NW (KF, QF) O-Ring
• Buna-N: 100°C Maximum
• Viton (Fluorocarbon, FKM): 200°C Maximum
• Silicone (Chemical Series): 200°C Maximum

NW40 Series Equivalent Names:
• KF40, KF-40, NW-40, QF40, Kwik Flange

NW40 Mesh Screen Ring Viton O-Ring

Price: $41.60
Overstock: $22.00
NW40 Mesh Screen Ring Buna O-Ring

Price: $36.00
Sale: $24.00
NW40 Mesh Screen Ring Silicone O-Ring

Price: $36.00
Sale: $24.00
NW40 Centering Ring Sintered Metal Filter



Viton® (Fluorocarbon) O-Ring:
200°C Maximum
• Viton® (Fluorocarbon)
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