Our factory is a specialized flexible tank manufacturing enterprise that integrates research and development, customized design, production, and sales.
The company's main products include flexible tanks, flexibags container, pre pressurized water tanks, flexible oil tanks, and soft biogas digester tanks. The products are environmentally friendly, innovative, corrosion-resistant, antioxidant, antifreeze, lightweight and practical.
After years of accumulation of production technology and experience, a complete management and manufacturing system has gradually been formed, providing sufficient guarantee for the "Zonghai" brand products.
Our factory adheres to the business philosophy of "quality as the foundation, customer centricity, and service as the guarantee", which has won the recognition of customers and its products are sold well at home and abroad.
About Us:
1,Our products are made from high-performance materials. (PE, PP, PVC, TPU) It is designed specifically for liquid transportation and storage. They are suitable for various scenarios such as food, non-food, and non-hazardous chemicals. Compared to traditional steel storage tanks, flexible storage tanks have become an ideal choice in modern industrial and logistics fields due to their lightweight, rust prevention, foldability, and quick installation advantages.
2,Materials and Certification:
Food-grade TPU: FDA certified, suitable for juice, dairy products, alcohol, etc., with no risk of plasticizer migration.
3,Industrial PVC/PP: acid and alkali resistant, UV resistant, compatible with lubricants, fertilizers, and non-hazardous chemicals (pH 1-12).
Military grade TPU: flame-retardant, puncture-resistant, meets MIL-STD standards, and is used for fuel/water transportation in field hospitals.
4, Scenario-based solutions:
Agricultural irrigation: storing water during the rainy season and irrigating during the dry season, occupying only 1 square meter after folding (e.g., 20000L water storage bag).
5,Disaster relief: Global airdrop within 72 hours to provide drinking water to disaster areas (supporting helicopter suspension delivery).
6,Shipping weight reduction: Replacing steel tanks can increase cargo capacity by 40% and increase single ship profit by 15% (supported by case data).
7,Technical parameter enhancement:
Capacity range: 100L small portable model → 100000L industrial customized model.
8,Temperature tolerance: TPU version -50 ℃~+100 ℃ (steam sterilization available), PE version -30 ℃~+70 ℃.
9,Pressure bearing capacity: Static stacking of 3 layers (full load), dynamic transportation impact resistance of 9.8m/s ².
Dear valued customer, regarding our company's products,
to better serve you, we prioritize understanding your specific procurement requirements. Your response will enable more efficient communication and faster resolution of any usage issues.
First, what are the specification requirements for the product you need?
We can customize the specific length, width, and height, as well as the material type and thickness, including material color. However, within this industry, red film TPU offers the highest corrosion and oxidation resistance. Our custom sizes have no upper limit. For TPU material, the customizable thickness range is 1.0mm to 1.2mm. For PVC material, the customizable thickness range is 0.85mm to 1.2mm. Finally, please provide your required dimensions, and we will offer a detailed quotation.
Second, our materials are categorized into TPU and PVC. TPU is available in food-grade and non-food-grade variants. Different materials can be produced in varying thicknesses. If you require containers for edible liquids like oil, please specify the TPU specifications, dimensions, and thickness parameters, as only TPU meets oil-containment standards.
Third, we also offer disposable liquid bags made of PP+PE material, primarily for semi-trailer and container transport, though they can handle other liquids depending on your requirements.
Fourth, for smoother communication, you may add my WhatsApp (+8613193536261) or reply directly to this email.
Fourth, all our export products come with corresponding test reports and certifications compliant with relevant national standards. Rest assured about product quality and standards—we have everything you require.
Fifth, we can incorporate your company logo, name, or any other relevant branding. As these are custom products, there are no restrictions.
Sixth, for custom products, pricing varies based on the minimum order quantity (MOQ). Since logistics costs differ by country, size, and delivery timeframe, we need to confirm your general requirements before providing specific unit pricing. Our custom product MOQ starts at 20 sets.
Seventh, based on usage frequency and folding cycles, both our TPU and PVC products have a lifespan of 8 to 12 years. We provide shipping insurance to ensure your goods arrive intact and undamaged. Even under heavy rain or extreme weather conditions, our products remain unaffected.
Eighth, Application Scenarios: PVC material is typically used for storing water (large, medium, or small volumes), chemical liquids, and waste liquids. TPU material is specifically designed for storing and transporting oil-based liquids like gasoline, diesel, engine oil, and edible oils. Our products are suitable for storing and transporting chemical liquids with a pH range between 3 and 8. Finally, we also offer disposable container liquid bags made of PP+PE material (available in military green, blue, and red clay colors). These materials can also be used for constructing and customizing large, medium, and small-sized recreational equipment, such as home swimming pools or barrel-shaped pools.
IX. Delivery and Shipping Lead Times: Our current delivery terms include EXW, FOB, CIF, etc. However, if your company requires alternative delivery methods, we can further discuss arrangements.
X. Detailed technical specifications and product information are available for browsing by category on our official website: https://www.watertankflexible.com.
In summary, upon receiving your detailed requirements, we will provide specific pricing, corresponding shipping costs, and estimated logistics timelines.
Finally, thank you for your patience. We will respond within 24 hours of receiving your email or WhatsApp message. We look forward to further collaboration and extend our best wishes for your continued success.
In the flexible liquid storage and transportation equipment industry, material technology and manufacturing processes remain the core factors determining product performance and quality. As a specialized manufacturer focused on the R&D and production of PVC and TPU liquid bladders, we consistently prioritize technological innovation and product upgrades as key strategies for long-term corporate development. Over the years, the company has continuously increased investments in material research, structural design, and production processes, committed to providing global customers with safer, more durable, and higher-performance flexible liquid storage and transportation solutions.
In material R&D, the company annually develops new products based on industry trends and market demands while continuously optimizing existing PVC and TPU materials.
Our R&D team maintains close collaboration with raw material suppliers and relevant technical institutions. Through extensive experimentation and data analysis, we systematically enhance material properties including corrosion resistance, aging resistance, oxidation resistance, flexibility, and environmental adaptability. Particularly in the TPU field, we continuously explore material formulations offering higher strength, improved oil resistance, and enhanced endurance in extreme environments. This ensures our products maintain stable performance under high/low temperatures, prolonged storage, and complex transportation conditions. Simultaneously, for PVC materials, we continuously refine formulations and production processes to achieve superior durability and cost-effectiveness while maintaining strength, catering to diverse application requirements.
Beyond raw material development, the company conducts annual in-depth research and technical upgrades on the latest production technologies and seam-sealing processes available in the market. Flexible fluid reservoir products demand exceptionally high standards for welding and seam-sealing techniques, where even minor process variations can compromise product integrity and overall strength. Therefore, our technical team continuously studies internationally advanced high-frequency heat sealing, hot melt welding, and composite structure stitching technologies, conducting ongoing process optimization and validation testing in actual production. By continually introducing advanced equipment and refining process flows, we effectively enhance product sealing performance, tear resistance, and overall structural stability, ensuring every product meets higher safety standards.
In product design, the company equally emphasizes the integration of innovation and practicality. Each year, we conduct systematic market research, gathering feedback from global customers across diverse application scenarios to continuously refine product structures and design solutions. Our design team continually explores more scientifically sound bladder structures, such as optimizing stress distribution, enhancing folding and transport convenience, and improving loading/unloading efficiency. Simultaneously, we continuously develop new product types and specifications to meet diverse customer needs across applications including water storage, oil storage, chemical liquid storage, and transportation. Through sustained design innovation, we not only enhance product utility but also broaden the application scope of flexible liquid storage and transportation equipment.
To ensure continuous advancement in R&D, the company invests substantial annual funds and maintains a specialized technical team dedicated to researching and testing new materials, processes, and products. From raw material selection and production process optimization to final product performance validation, every stage undergoes rigorous technical evaluation and quality control. The company also continuously introduces advanced testing equipment to comprehensively assess products' tensile strength, pressure resistance, corrosion resistance, and sealing performance, ensuring all items meet stringent quality standards before shipment.
It is precisely through this long-term commitment to continuous investment in technological R&D and production processes that our PVC and TPU liquid storage bags have achieved industry-leading levels of durability, safety, and stability. Whether in water resource storage, petroleum product transportation, agricultural irrigation, emergency reserves, or chemical liquid storage, our products provide reliable solutions for our customers.
Simultaneously, we firmly believe that high-quality products are underpinned by a professional and experienced team. From R&D engineers to production technicians and quality management personnel, every member possesses extensive expertise in their respective fields and maintains a relentless pursuit of technological advancement and product excellence. Through seamless collaboration across all stages—from product design and manufacturing to quality inspection—each process is rigorously controlled to ensure the final products delivered to customers exhibit stable and reliable performance.
Moving forward, we will steadfastly pursue technological innovation, increasing investment in material research, production processes, and product design to continuously elevate the technical standards and quality benchmarks of our PVC and TPU liquid bladder products. Through relentless exploration and breakthroughs, we aim to provide global customers with more advanced, secure, and efficient flexible liquid storage and transportation solutions, while collaborating with partners to drive sustained progress and development within the industry.
