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HERCULES URETHANE BACKUP Ring 90A DUROMETER

Alternate Part Numbers Alternate Part Number C1BV79, Alternate Part Number MI-01811040, Alternate Part Number MINO-00407Q30810	Brand Hercules Sealing Products	Brand Hercules Sealing Products	Pack Size 1.00	UOM EA	Supplier Part Number 575-443	Product Weight 0.03 lbs

Product Questions & Answers 1

Product Questions & Answers

what exactly is a backup ring used for in a hydraulic setup, and does the urethane material hold up better than rubber in high-pressure situations?

Question by: Travis R on Mar 26, 2025, 6:46 PM

Backup rings sit behind a primary seal to keep it from extruding into the clearance gap under pressure. Urethane at 90A durometer is notably firmer than standard rubber compounds, which helps it resist that kind of deformation in demanding hydraulic applications. The Hercules 575-443 is built to that hardness spec, so it holds its shape where a softer material might start to flow or distort over time.

Answer by: Customer Support on Mar 28, 2025, 7:51 AM