Analysis of Mold Cost Proportion in Total Cost for Hollow-Out UHPC Shapes and Discussion of Influencing Factors

Molds are the "genetic code" of UHPC sculptural art, and their cost control directly determines the balance between a project's economics and artistry.

In the field of contemporary architectural decoration, UHPC (Ultra-High Performance Concrete) has become the material of choice for landmark building facade design thanks to its outstanding mechanical performance and freedom of form. However, achieving complex shapes such as openwork and irregular forms relies heavily on custom molds, whose cost share often becomes a key variable in project investment decisions. As an industry leader with 28 years of dedicated experience in UHPC/GRC/GRG/GRP materials, Qinglong Group draws on hands-on experience from over a thousand projects to provide an in-depth analysis of mold cost composition and its influencing factors, offering designers and owners a full-chain cost optimization solution.

I. Cost Composition Analysis of Openwork UHPC Shape Molds

In typical openwork UHPC component projects, mold costs account for 15%-35% of the total cost, depending on shape complexity, production scale, and process selection. In terms of cost structure, design and R&D account for about 20% (including parametric modeling and structural verification), material costs for 40% (e.g., steel molds, silicone molds, and composite molds), machining and fabrication for 30% (including CNC engraving and manual polishing), and the remainder for maintenance and turnover costs. For example, in a cultural center openwork curtain wall project, a single double-curved irregular mold cost as much as RMB 120,000—three times higher than a conventional flat-panel mold—directly driving up the overall component cost.

II. Key Factors Affecting Mold Costs and Quantitative Analysis

1. Shape Complexity: For every 10% increase in the porosity of an openwork pattern, mold machining time increases by 25%. Topological structures generated by parametric design require customized five-axis machining centers, raising costs by 40%-60% compared with traditional engraving. Through its independently developed BIM parametric decomposition technology, Qinglong Group can shorten the design cycle for complex-shape molds by 30%, effectively controlling upfront costs.

2. Mold Material Selection: Steel molds, despite a high initial investment (about RMB 8,000/m²), can be reused more than 50 times and are suitable for large-volume standardized components; silicone molds cost only RMB 2,000/m² but can be used just 5-8 times, making them more suitable for small-batch art installations. A commercial complex project adopted a composite process of "steel molds with partial silicone inserts," reducing overall mold costs by 18%.

3. Production Scale Effects: When component output exceeds 50 units, amortized mold costs drop significantly. With an annual capacity of 600,000 square meters at its Guangxi production base, Qinglong can double mold turnover efficiency through centralized production scheduling, cutting mold costs per component by 25%-35%.

4. Innovative Process Applications: 3D-printed mold technology can compress the production cycle for complex shapes by 50%, but material costs remain relatively high at present (about RMB 12,000/m²), making it suitable for special components with irregularity exceeding 80%. The General Technical Conditions for Ultra-High Performance Concrete (UHPC) Non-Load-Bearing Components, a standard Qinglong helped formulate, provides an industry benchmark for mold standardization.

III. Full-Chain Cost Optimization Strategies and Practical Cases

As a National High-Tech Enterprise, Qinglong Group has established an integrated "design-production-construction" cost control system: at the design stage, Rhino-Grasshopper parametric optimization is used to reduce unnecessary openwork details; in production, a mold-sharing platform enables cross-project resource reuse; and modular hoisting is adopted for construction and installation to lower on-site secondary processing costs. In the Nanjing East Road Century Plaza renovation project, the coordinated design of light-transmitting UHPC components and glass curtain walls kept overall mold costs at 22% of the total project cost—9 percentage points below the industry average.

[Summary] Mold cost control for openwork UHPC shapes is an art of balancing technology and economics. Backed by 28 years of full industry chain experience, Qinglong Group keeps the mold cost share stable within a reasonable range through material innovation, process optimization, and economies of scale—ensuring both the ultimate expression of architectural art and efficient returns on project investment. Going forward, with the development of technologies such as 3D printing and biodegradable molds, the economics of UHPC shapes will further improve, bringing more possibilities to building facade design.