Specifications
Back-up rings are the most common anti-extrusion devices in dynamic sealing. They provide simple solutions to safely increase system function by positioning a more robust material adjacent to the extrusion gap, taking the seal's place and providing a barrier against high pressures. Back UPS can be used to offset the reduced pressure rating effects of wear rings or to improve seal against pressure spikes, or to ensure seal performance at higher tempertures.

Quality Assurance
DEF Seals manufacture high-quality back-UPS to meet harsh sealing environment. Our seals are one of the best choice of spare parts of Hitachi, Kobelco, Kamastu, Hyundai, Caterpillar.
Please check the catagory for detail.

Material Range
Virgin PTFE, PTFE+bronze, PTFE+carbon, PTFE+glass, PTFE+graphite, POM, etc.

Color Range
Brown, Green, White, Black, Blue, etc.

Special Service
This seal can be provided with slash cut or no cut.

Workshop

How to order from us? 

• 1 Contact DEF's salesman to get a quotation.( by Email, Telephone, Trademessage)
• 2 Send DEF your asked type and detailed instruction(mateials, size, quantity,color, special requestes etc.)
• 3 Will send price and other details informations to you,send back Purchaser Order for approval
• 4 After confirm order and timeline, DEF'll start production procedure once receive payment.
• 5 If require sample, please inform DEF in advance.
• 6 5~10 working days for making seals.
• 7 Quality Checking, DEF can send bulk order photo for approval before packing, if you need.
• 8 Packing
• 9 Order release for shipping.
• 10 Any issue,please contact DEF after receive package. DEF'll invest and consult with you for solution.
• Quality and Service are  DEF principle.

Please feel free to contact us if you need more details about our factory and products.