Materials, compatibility, ordering and commercial terms — answered straight from the factory floor. Can't find your question? Ask our engineers.
BORISE seals are made from three proprietary polyurethane (PU) systems — PHDI, PPDI and MDI. PHDI is the general high-performance grade, PPDI is the top tier (PPDI O-rings are rated to 130 °C), and MDI (grade B6000) is a cost-effective system based on the Parker P6000 formulation. All three are formulated and produced in-house.
PPDI delivers the highest temperature and pressure performance and the longest service life — 2–3× that of polyamide. PHDI is the balanced high-performance grade for general hydraulic duty. MDI (B6000) is the economical choice for standard applications. See the Materials page for a full comparison.
BORISE polyurethane offers 3–10× the wear resistance of NBR in abrasive duty, with higher extrusion resistance and a wider temperature range. NBR remains the lower-cost choice for clean, low-pressure, low-speed duty.
Standard PU O-rings are 90 Shore A hardness with 30–70 MPa tensile strength and seal up to 25–32 MPa without backup rings; PPDI O-rings are rated to 130 °C. Exact limits depend on the profile, fluid and duty cycle — send us your cylinder data for a technical review.
Both. The catalogue covers 62 sealing-element families in 12 types (piston, rod, dust, buffer, step, gas, O-ring & gasket, diaphragm, static, rotary, guide band and retaining ring) as individual parts, plus complete rebuild kits by machine and cylinder position.
Yes. The seal-kit catalogue covers 212 excavator models across 9 brands — including 44 CAT excavator models — plus 342 Caterpillar machines across 17 types (crawler and wheel loaders, dozers, graders, scrapers, pipelayers, haul trucks and specialty carriers), listing 889 cylinder positions and 1,350 kit references. Kits are built to order.
Yes — 403 hydraulic breaker models across 18 brands, including Furukawa, NPK, Toku, Montabert, Rammer, Atlas Copco, Soosan, Indeco, Okada, MSB and Daemo, covering the 7 seal types used in breaker rebuilds.
Boom, arm, bucket, central joint, swing motor, travel motor, control valve and hydraulic pump kits — 10 sealing positions per machine, 1,610 kit entries in total.
Reference codes indicate dimensional and functional interchangeability only. Always confirm pressure, temperature, fluid and cylinder condition before ordering — our engineers review your data on request. BORISE is not affiliated with, authorised by or endorsed by the equipment manufacturers whose model numbers are referenced.
Use the quote form on the Contact page or email info@borise-seal.com with the machine model and cylinder position, or the seal dimensions and part number you need. We reply with price, lead time and a material recommendation.
Yes. We manufacture under our own BORISE brand and as an OEM/ODM supplier, including custom profiles, sizes and materials made to your drawing.
Standard catalogue seals are available from small quantities; custom tooling items are quoted individually. MOQ, sample charges and tooling costs are stated in each quotation.
Yes, samples are available for evaluation. Any sample charge is stated in the quotation.
Lead times are stated per quotation and start from receipt of the deposit and approval of drawings. Unless agreed otherwise, deliveries are made FOB a Chinese port under Incoterms 2020.
Products are warranted to conform to the agreed specification for 12 months from the date of shipment. Normal wear, incorrect storage or installation, contamination, and use outside the stated pressure, temperature or fluid limits are excluded.
Yes. BORISE — Hangzhou Ruiwei Technology Co., Ltd. — is ISO 9001 certified and holds 15 patents (5 invention patents and 10 utility-model patents).
Our factory is in Hangzhou, Zhejiang, China, and we export to the United States, Europe, the Middle East and Southeast Asia.
12 heavy-industry applications — excavators, hydraulic breakers, cranes, mining machinery, agriculture, road construction, forestry, material handling, rock drills, fan equipment, cylinder oil seals and hydraulic pump seals.
Send us the machine model and cylinder position — or a photo of the seal — and our engineers will come back with the right kit, material recommendation and a quotation.
