Repost: Two-stage (baking) vulcanization of silicone rubber
Mar 02,2026
After a first-stage vulcanization, since the temperature (150℃) is relatively low, some low-molecular-weight substances still remain in the vulcanized rubber, thereby affecting the product’s performance. For example, in silicone rubbers vulcanized with BP or DCBP, the acidic substances—such as benzoic acid—that are generated from the decomposition of the vulcanizing agent remain in the vulcanized rubber after the first-stage vulcanization. When the product is used under high-temperature, sealed conditions above 200℃, these substances cause cracking, leading to a significant drop in hardness and a sharp deterioration in physical and mechanical properties, ultimately rendering the product unusable. To address this issue, a second-stage vulcanization is required to remove various low-molecular-weight substances from the rubber. Moreover, the second-stage vulcanization can also eliminate moisture or crystal water from fillers, thereby preventing hydrolytic aging of silicone rubber products during use or storage.
Mar 02,2026
A product engineer’s day typically begins with checking emails and reviewing project progress. For product engineers at manufacturing companies that produce automotive parts, consumer electronics, and other products, the top priority is to thoroughly understand the product drawings, data, and technical standards provided by customers.
How to Control Procurement Costs-related
Mar 02,2026
Procurement involves multiple aspects, including price fluctuations, logistics costs, and supplier coordination. We’ve organized procurement strategies and tool resources for your reference.
Feb 28,2026
In January 2026, Dalian Bohai Rubber & Plastic Co., Ltd. (hereinafter referred to as “Bohai Rubber & Plastic”) announced its continued deepening of its business layout in the automotive sealing ring sector. Through technological upgrades and capacity expansion, the company aims to fully meet the demands of the automotive industry. This strategic focus by Bohai Rubber & Plastic is designed to drive collaborative innovation across the industrial chain with high-performance sealing solutions.
Feb 28,2026
Dalian Bohai Rubber & Plastic Co., Ltd. is a rubber products enterprise integrating R&D, production, and sales, specializing in the customization and production of compounded rubber (also known as “rubber compounds”).
Quality Issue Workshop for the Manufacturing Department
Feb 26,2026
Recently, a key product of one of our company’s important clients encountered serious quality issues during the molding process, putting it at risk of being halted from production. The issue must be resolved quickly and efficiently; otherwise, it could disrupt product deliveries, lead to substantial financial losses, and severely damage the company’s reputation. In this critical situation, the Production Director led a team comprising representatives from technology, manufacturing, and quality assurance, voluntarily sacrificing their personal time to go deep into the field and conduct repeated, meticulous verification. Ultimately, the problem was resolved efficiently within a short period, ensuring both product quality and compliance with the client’s delivery requirements. We applaud Bohai for its highly efficient work ethic and rigorous approach. We are confident that the company will continue to develop in a sustained, stable, and healthy manner.
Horses of the Sea, Shaping the Future—2026 Bohai Annual Conference
Feb 13,2026
On the sunny morning of February 8, 2026, all Bohai employees gathered at the Oriental Building to look back on 2025 and look forward to 2026. With fine wines, joyful music, and lively conversations, we set off together toward a brighter future.
Feb 13,2026
Dear Bohai family members, the annual gala that truly belongs to us Bohai folks is now officially underway!
During the annual meeting, the Quality Department poured their heart and soul into creating the song “Quality Heroes” (adapted from “Swords Like Dreams”). In 2026, all members of Bohai’s Quality Department will “ride forth on swift steeds and forge the future.”
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Contact Information
Address: No. 39-6-1, No. 2, Gangxing Street, Economic and Technological Development Zone, Dalian City, Liaoning Province
Telephone:0411-88035927
Fax:0411-88035927
Mailbox:liuchunhong@dlbhxs.com
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