Views: 0 Author: Site Editor Publish Time: 2026-05-22 Origin: Site
As a high-performance elastic composite material, EPDM colored granules have replaced traditional rubber and plastic flooring materials in many public infrastructure projects. Different from single raw materials, EPDM colored granules are compounded by multiple components according to specific weight percentages. Each component bears independent functional attributes, and the scientific matching of weight ratios directly determines the final application performance of the material.
In actual engineering applications, many quality problems of EPDM flooring are caused by unreasonable weight composition selection. For example, excessive filler content in professional sports ground materials leads to insufficient shock absorption; insufficient pigment content in outdoor playground granules causes rapid fading; and excessive plasticizer addition in commercial flooring results in poor wear resistance. Therefore, it is necessary to classify and formulate standardized weight composition schemes according to different usage scenarios, performance standards and service environments. This paper focuses on the scenario-based selection logic of EPDM granule weight components, and clarifies the optimal proportion range of each raw material for different application demands.
The total weight of EPDM colored granule compound formula is defined as 100 wt%. All components are divided into six functional modules, and each module has a fixed effective weight range and core performance functions, which is the basic basis for scenario selection.
As the core elastic matrix, EPDM rubber determines the elasticity, tensile strength, aging resistance and service life of the granules. The higher the rubber weight ratio, the better the comprehensive mechanical performance, but the higher the production cost. It is the primary indicator for grading EPDM granules.
Inorganic fillers represented by calcium carbonate, silica and kaolin are the largest proportion of components. They mainly reduce production costs, improve material hardness and wear resistance, and optimize production processability. Excessively high filler content will reduce elasticity and toughness, while low filler content will lead to high cost and insufficient surface hardness.
Plasticizers are mainly used to improve the mixing and granulation process performance of rubber materials, and enhance the low-temperature toughness of granules. Appropriate plasticizer content can prevent the material from brittle cracking in low-temperature environments, while excessive addition will cause the granules to be soft and deformed with poor wear resistance.
Inorganic and organic pigments determine the color brightness and color fastness of EPDM granules. High weather-resistant inorganic pigments are suitable for long-term outdoor use, while high-chroma organic pigments are used for decorative scenes requiring bright colors. The pigment ratio needs to be increased for outdoor color-sensitive scenes and reduced appropriately for indoor conventional scenes.
The vulcanizing agent and accelerator system promotes the cross-linking of EPDM molecular chains, realizing the transformation from plastic state to high-elasticity state. Sufficient vulcanizing components ensure stable structural strength of granules, while insufficient vulcanization will lead to poor elasticity and easy powder falling.
UV stabilizers, antioxidants and dispersants are auxiliary functional components. Although the weight ratio is low, they play a key role in anti-aging, anti-fading and uniform color formation, which is an essential guarantee for the long-term stable use of outdoor EPDM granules.
Combined with engineering application standards, performance requirements and cost budgets, EPDM colored granules are divided into four typical application scenarios, with targeted optimal weight composition schemes formulated respectively.
Professional sports tracks and stadium floors require high shock absorption, excellent wear resistance, ultra-strong weather resistance and long service life, focusing on sports protection and durability. The high rubber formula is adopted with balanced filler and sufficient anti-aging additives. The optimal weight composition is: EPDM rubber 25–30 wt%, inorganic fillers 45–50 wt%, plasticizers 5–7 wt%, pigments 3–5 wt%, vulcanizing system 1.5–2.5 wt%, functional additives 1–2.5 wt%. This formula ensures that the granules have stable elasticity and mechanical strength, and can resist long-term outdoor ultraviolet radiation and high-frequency trampling.
This scenario takes safety protection, environmental non-toxicity and bright decorative effect as the core demands. It requires moderate elasticity to buffer falling impact, uniform and bright color, and safe and environmentally friendly raw materials. The optimal weight composition is: EPDM rubber 22–26 wt%, inorganic fillers 48–52 wt%, plasticizers 4–6 wt%, pigments 6–9 wt%, vulcanizing system 1.2–2 wt%, functional additives 0.8–1.5 wt%. Appropriately increasing the pigment content ensures bright color matching for children’s activity spaces, and the medium rubber ratio balances safety elasticity and engineering cost.
Municipal leisure venues focus on weather resistance, low maintenance cost and moderate durability, with no ultra-high requirements for elasticity. The formula pursues performance and cost balance. The optimal weight composition is: EPDM rubber 18–22 wt%, inorganic fillers 52–58 wt%, plasticizers 3–5 wt%, pigments 3–5 wt%, vulcanizing system 1–1.8 wt%, functional additives 0.5–1 wt%. The appropriately increased filler content reduces the overall cost, while ensuring basic anti-aging and anti-fading performance to adapt to long-term outdoor open-air use.
Commercial flooring such as shopping malls, hospitals and corridors requires wear resistance, pressure resistance, anti-slip and easy cleaning, with low demand for elastic buffering. It is a cost-sensitive scenario. The optimal weight composition is: EPDM rubber 15–19 wt%, inorganic fillers 55–60 wt%, plasticizers 3–4 wt%, pigments 2–4 wt%, vulcanizing system 0.8–1.5 wt%, functional additives 0.3–0.8 wt%. The high-filler and low-rubber formula significantly reduces the engineering cost, and meets the daily wear-resistant and anti-slip use demands of indoor low-frequency sports scenes.
On the basis of the standard scenario formula, appropriate ratio adjustment can be carried out according to regional environment and special demands. First, for high-altitude and strong ultraviolet outdoor areas, the weight ratio of UV stabilizers and antioxidants should be increased to enhance anti-aging and anti-fading ability. Second, for cold northern regions, the plasticizer content can be increased by 1–2 wt% to improve the low-temperature toughness of granules and prevent brittle cracking. Third, for high-color-decoration-demand projects, the proportion of high weather-resistant inorganic pigments can be appropriately increased on the premise of not reducing rubber performance. Fourth, excessive filler content should be strictly avoided in high-elasticity required scenes to prevent the material from hardening and losing buffering performance.
The selection of EPDM colored granules weight composition must be matched with actual application scenarios. The rubber content determines the overall performance grade of the granules, the filler content controls the cost and hardness, and the pigments, plasticizers and functional additives optimize the usability and durability. Professional sports venues adopt high-rubber and low-filler formulas, children’s playgrounds adopt medium-rubber and high-color formulas, municipal walkways adopt balanced cost-performance formulas, and indoor commercial flooring adopts economic high-filler formulas. Following the scenario-based weight ratio matching principle can effectively avoid common quality problems, maximize material performance, and realize the optimal balance between engineering quality and economic cost. This selection method provides a standardized technical reference for the fine production and engineering application of EPDM colored granules.
