The dry powder coating for lost foam casting is a powder-form foundry coating developed specifically for the lost foam casting process and the production requirements of ductile iron castings. Compared with traditional water-based and alcohol-based coatings, it offers greater formulation flexibility, easier storage and transportation, and improved environmental performance. As a result, it has been increasingly adopted in the large-scale production of ductile iron components.

Core Functions of Ductile Iron Dry Powder Coating:

1.Compatibility with Ductile Iron Pouring Characteristics

The coating features moderate refractoriness (1500–1600 °C), well matched to the pouring temperature of ductile iron (1380–1450 °C). Aggregates such as quartz powder and bentonite are commonly used to avoid adverse reactions with nodulizing and inoculating agents, thereby ensuring stable nodularity and mechanical properties.

2.Low Gas Generation to Prevent Gas-Related Defects

The binder system (e.g., bentonite combined with CMC) exhibits low moisture absorption and generates minimal gas after drying. Together with properly controlled permeability, it allows the smooth evacuation of gases generated during foam pattern vaporization, effectively reducing subsurface porosity and pinhole defects.

3.Strong Adhesion with Easy Peel-Off

The coating demonstrates excellent hang-on properties and uniform wetting of foam patterns. It remains crack-free and firmly bonded after drying. After pouring, the coating peels off easily in flakes, leaving a smooth casting surface and minimizing post-casting cleaning operations.

4.Flexible Process Adaptation with Cost Efficiency

Recommended water-to-powder ratio: approximately 1:0.55–0.65. The coating can be applied by dipping or brushing and is suitable for various ductile iron castings such as crankshafts, valve bodies, and wheel hubs. With a long shelf life and convenient on-site mixing, it is well suited for batch and mass production.

Zibo Tongpu Vacuum Equipment Co., Ltd. is located in the industrial machinery manufacturing base of China, the hometown of QlLU culture----.Gaoqing economic development zone, Zibo city of Shandong province.

Zibo Tongpu is a professional manufacturer that specialized in lost form and V-method casting equipment and all kinds of vacuum pumps. Here brought together a large number of science and technology workers at lost form and V-method casting for many years that have the rich experience. They are not only proficient in lost form and V-method design and manufacture of theoretical knowledge, but also have rich practical experience. So the equipment's new design could be more close to the users, more in line with the actual needs.

Zibo Tongpu founded in 2005, for the user to manufacture a number of lost form and V-method production lines successively. Including fully-automatic and semi-automatic production lines, but also tailored to the user's simple production line. Our products have a broad market, covering more than twenty provinces, cities and autonomous regions across in China. At the same time, exported to Thailand, South Korea, Taiwan, Vietnam, Indonesia, and Kazakhstan, Russia and so on countries and regions.

Zibo Tongpu has strong technical development and technology service capabilities. We can provide not only reliable casting equipment, but also lost form and V-method molding technology service. Meanwhile, we also undertake "turn-key" projects, according to customers’ demand. Besides, we have set up a foundry plant which adopts the lost form and V-method molding technique as main means of production so as to provide test base for customers to carry out first-phase product testing and stuff training. We provide a variety of services to need of customers at different levels.

We can willing to provide you our best and most sincere service! Let us join hands and work together for common development and growing. and achieve even greater glory. 

Zibo Tongpu can offer the following services:

One, Product trial: In the experimental base can be carried out with the early production development, to form a complete product technology and economic parameters report.

Two, Engineering design: Can provide the most optimized engineering design, the most reasonable process, the most economical investment costs, the most economical running costs

Three, Pre-sale service: Timely provide the prefect technical and business consulting, free to the field survey, technical communication with customers, and Professional design according to customer's requirement.

Four, Sale service: At the same time of equipment manufacture, responsible for the relevant personnel of the technical training, provide perfect technology solution, to ensure the project on schedule.

Five, After-sales service: have regular review system, listen to customer Suggestions. Establish customer service files, provide free lifetime technical support. No matter inside and outside the warranty period the received information respond immediately.