One-Stop Professional Fire Door Solutions for Every Scenario
From residential steel fire doors to specialized medical and school doors. 50+ series designed to meet the highest safety standards worldwide.
About us
A Leading Manufacturer in Fire Safety with 15+ Years of Expertise
Longzhengsheng is a premier fire door manufacturer in North China, integrating R&D, production, and sales. With two modernized production bases covering over 33,000 m², we lead the industry in both capacity and specialization. As a National High-Tech Enterprise, we provide professional-grade steel and wood fire doors, medical doors, and industrial doors, ensuring top-tier safety and quality for residential and commercial projects worldwide.
what we do
Our Products
Expertly crafted fire and explosion-proof doors. From industrial blast-resistant systems to medical-grade solutions, we provide ISO-certified, customizable safety for global infrastructure.
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Chemical Plant Specialized Explosion-Proof & Fire-Rated Door
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Gas-Tight Sealing: Engineered with advanced hermetic seals to prevent the infiltration of hazardous chemical vapors and smoke.
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Extreme Heat Resistance: Delivers high fire-integrity ratings to ensure structural stability under intense industrial fire conditions.
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Corrosion-Proof Finish: Specialized UV-resistant and anti-corrosive coating designed to withstand harsh desert humidity and chemical exposure.
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Impact-Tested Steel: Constructed from heavy-duty galvanized steel to dissipate blast energy and protect critical facility zones.
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Certified Safety: Fully compliant with international safety protocols for oil, gas, and chemical storage facilities.
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Customized Steel Explosion-Proof & Fire-Rated Door
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Ultimate Safety: Combines high-strength blast resistance with Grade A fire integrity to block smoke and flames effectively.
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Extreme Resistance: Engineered to withstand high temperatures and intense physical impacts, ideal for harsh industrial climates.
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Tailored Precision: Fully customizable dimensions and hardware configurations to meet specific project safety requirements.
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Built to Last: Features anti-corrosive coatings and heavy-duty galvanized steel, ensuring durability in high-heat and sandy environments.
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Certified Reliability: Produced under ISO 9001 standards by a National High-Tech Enterprise, ensuring global compliance for oil, gas, and energy sectors.
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Steel Explosion-Proof & Fireproof Door | Class A Flame-Retardant Explosion-Isolation Special Door for Industrial Workshops
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High-Level Security: Integrated Grade A fire resistance and explosion-proof structure designed for hazardous industrial environments.
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Certified Durability: Manufactured under ISO9001 standards with high-strength galvanized steel to withstand extreme Middle Eastern heat.
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Precision Engineering: Features advanced laser-cutting technology for seamless fit and superior blast-pressure resistance.
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Customized Solutions: Flexible dimensions and specifications (locking systems, vision panels) tailored to oil, gas, and chemical facilities.
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Reliable Protection: Designed to contain blasts and prevent fire spread, ensuring the safety of personnel and high-value assets.
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