When this product direction fits
Solar-reflective systems for roofs, tanks and exposed surfaces where absorbed solar heat is the main concern.
Solar Reflective Thermal Coatings
DY-21
Water-Based Solar Reflective Coating
Solar-reflective systems for roofs, tanks and exposed surfaces where absorbed solar heat is the main concern.
Product overview
Solar-reflective systems for roofs, tanks and exposed surfaces where absorbed solar heat is the main concern.
A water-based reflective coating using resin binders, reflective titanium dioxide, hollow microspheres, ceramic powder, rare-earth oxides and functional additives.
Problems addressed
Solar heat gainHigh surface temperature under sunlightOutdoor weather exposure
Selection guidance
How this system differs
This series addresses solar heat gain at exposed surfaces and is different from insulation intended to control heat passing from process equipment.
What must be confirmed
Suitability depends on the actual substrate, medium, concentration, temperature cycle, exposure mode and application window. Final system selection and project-specific instructions require technical review.
Product features and advantages
High solar reflectance
High thermal emittance
Water-based, low-odour application
Weather and UV resistance
Typical application context
Applications and operating conditions
Industrial Buildings & Logistics · Petrochemical & Refining · Grain, Feed & Agricultural Storage: application review for Industrial roof · Storage tank · Steel structure.
Solar-reflective systems for roofs, tanks and exposed surfaces where absorbed solar heat is the main concern. Confirm the substrate, exposure and maintenance access before final selection.
Suitable equipment
Industries
Industrial Buildings & Logistics
Petrochemical & Refining
Grain, Feed & Agricultural Storage
Power & Energy
Substrates and areas
Sun-exposed metal surfaces · Roof surfaces · Tank exteriors
Operating conditions
Outdoor solar exposure · Weathering · Heat-load management
DY-21
Technical parameters
Only values available in the reviewed product source are shown.
Technical parametersValueSource
ComponentsSingle-component, water-based
Recommended Dry Film Thickness75 μm
Touch Dry Time<2 h
Recoat Interval≥4 h
Container StateNo hard lumps; uniform after stirringGB/T 6753.3-1986
AppearanceWhite; smooth filmGB/T 1729-1979
Solid Content≥55%GB/T 1725-2007
Hardness2HGB/T 6739-2006
Thermal Cycling5 cycles; no abnormalityGB/T 9278-2008
Storage Stability50°C, 7 d; no abnormalityGB/T 6753.3-1986
Flexibility≤1 mmGB/T 6724-2007
Impact Resistance≥50 cmGB/T 1732-1993
AdhesionGrade 1GB/T 9286-1998
Fineness≤20 μmGB/T 6753.1-2007
Viscosity45-50 s (No. 4 cup)GB/T 6753.4-1998
Water Resistance168 h; no blistering, cracking or delaminationGB/T 1733-1993
Scrub Resistance≥5000 cyclesGB/T 9266-2009
Solar Reflectance0.86 (white)GB/T 25261-2018
Thermal Emittance0.85 (white)GB/T 25261-2018
Aging Resistance1000 h; no blistering, cracking, delamination or chalkingGB/T 23987-2009
Theoretical Coverage0.2 kg/m² at 75 μmFactory test
Project application guidance
Confirm substrate condition, contamination, corrosion, defects and access before work starts.
Remove oil, dust and loose material; prepare cleanliness and profile to the reviewed product procedure.
Check compatibility of retained coatings and complete a representative trial area when the existing system is uncertain.
Prepare and mix only according to the product source; do not improvise ratio, thinner or pot life.
Build a continuous system in controlled layers, with special attention to edges, welds, joints and shadow zones.
Protect the applied area through curing, then inspect continuity, visible defects and recorded source-backed acceptance items.
Source-specific procedure
Surface Preparation
Prepare the substrate to remove oil, rust, dust and loose material; confirm the compatible primer system for the actual substrate.
Application Environment
Normally ≥10°C; substrate at least 3°C above dew point; relative humidity ≤85%; stop below 5°C.
Mixing
Stir the single-component coating mechanically until uniform.
Application Tools
Roller or airless spray.
Recommended Total Thickness
Two coats are recommended in the source document.
Recoat Time
At least 4 h.
Precautions
Water dilution only when needed, recommended at no more than 5%.
Packaging, storage and transport
Packaging20 kg/pail
StorageDry, cool, clean interior; protect from freezing and sunlight; 5-40°C
Shelf Life18 months unopened
TransportMaintain 5-40°C
Official product source: Reviewed DAYU-X technical source for DY-21 water-based solar reflective coating
Quality checks
Check surface-preparation records, environmental conditions, layer continuity, edges, welds and visible defects. Use only acceptance criteria stated in the reviewed product or project documents.
Maintenance and repair
Inspect representative high-risk locations during planned maintenance. Clean the area, identify the cause of damage, feather sound edges and verify compatibility before local repair.
Scope and limitations
Suitability depends on the actual substrate, medium, concentration, temperature cycle, exposure mode and application window. Final system selection and project-specific instructions require technical review.
Technical documents
Documents for project evaluation
TDS, SDS, MSDS, test reports and other project-related technical documents are available based on specific project requirements. Please contact us through WhatsApp.
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Related technical content
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PetrochemicalLarge storage tank roof and exterior
Storage Tank Solar-Reflective Application
Strong solar radiation and outdoor weather exposure on roofs, tanks and building surfaces.
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Buildings & Energy EfficiencyMetal factory roof
Steel-Structure Factory Roof Solar-Reflective Application
Large exposed roof areas, joints and weathered substrates receive sustained solar radiation.
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