Rubber Sealing Manufacturing in Jinhua, China
Jinhua Haobo Sealing Technology Co., Ltd. manufactures rubber oil seals, O-rings and custom molded sealing components for automotive and industrial equipment. Production is based in Tangxi Town, Jinhua, Zhejiang, serving sealing applications across automotive and industrial equipment.
A Sealing Manufacturer Built Around In-House Production
Haobo is registered in Wucheng District, Jinhua. Its production site at No. 89, Hucheng Street, Tangxi Town handles the core work required to turn rubber compounds and metal cases into finished sealing components.
The company concentrates on rotary shaft oil seals, O-rings and molded rubber sealing parts. Its business is centered on elastomer sealing components rather than a broad mixed catalog of unrelated mechanical parts.
Core Sealing Product Lines
The product range is centered on compact sealing components used around shafts, housings and mechanical interfaces.
Rotary Shaft Oil Seals
Rubber-covered, metal-cased and skeleton-style oil seals are produced for rotating shaft positions in engines, transmissions, motors, pumps, compressors and reducers.
O-Rings
O-rings are molded in elastomer compounds including NBR and FKM and can be supplied alongside shaft seals when a sealing assembly uses both rotary and static sealing elements.
Custom Molded Sealing Parts
Non-standard sealing parts can be developed from drawings, samples and installation dimensions, with profile, material and tooling defined before production release.
From Plant Start-Up to Integrated Seal Production
Haobo's development has focused on bringing the main production stages for rubber seals into one operating site and extending that base to non-standard sealing projects.
2018.02
Manufacturing Operation Began in Jinhua
The Tangxi production site started operation in February 2018, establishing Haobo's manufacturing base for rubber oil seals and O-rings.
Today
Standard and Non-Standard Sealing Production
The current operation combines regular seal production with drawing- and sample-based development for non-standard dimensions, profiles and labeling requirements
A Practical Base for Molded Rubber Sealing
The factory is configured around compound preparation, compression molding and finishing for small precision sealing components.
One-Site Production
Rubber mixing, preforming, molding and finishing are organized within the Tangxi facility, keeping the main manufacturing stages under one production system.
Compression Molding Platform
Compression molding equipment is used for oil seals and O-rings across different mold sizes and cavity arrangements in regular production.
Sealing-Specific Finishing
Post-molding work includes flash trimming and spring fitting for spring-loaded shaft seals, preparing molded parts for final inspection and packing.
From Part Definition to Production Release
Non-standard projects begin with the part geometry and operating conditions rather than a fixed catalog size. Drawings, physical samples or installation dimensions are used to define the seal before tooling and production are released.
Technical Input
Drawing, physical sample, ID / OD / width or groove dimensions form the starting specification.
Material & Profile Review
Elastomer and seal profile are matched to the defined fluid, temperature, movement and installation conditions.
Tooling to Approved Part
Tooling is developed to the approved geometry, followed by sample verification before repeat production.
Control the Material, Process and Finished Part
Material Control
Incoming rubber lots and metal cases are verified before they enter mixing and molding operations.
Process Control
Time, temperature and pressure are recorded during compression molding to keep the production cycle tied to defined process settings.
Batch Verification
Inside diameter, outside diameter and width are measured, while lip condition and Shore A hardness are sampled by batch.
Current Manufacturing Footprint
10,000 m²
Covered factory area
20+
Production staff on site
100–350 t
Compression press range
Factory and Product Images
Tangxi production site entrance
Factory buildings in Jinhua, Zhejiang
Representative molded O-ring products