1. Technical indicators of polyurethane super wear-resistant topcoat**

1. **Basic performance** - **Abrasion resistance** (key indicators): - Taber abrasion (1000g/1000r): ≤30mg (far exceeding ordinary epoxy flooring, usually ≤50-100mg). - Anti-scratch performance: resistant to wire wheel friction (≥500 times without scratches). - **Hardness** (Shore hardness/pencil hardness): Shore D≥75, or pencil hardness ≥3H. - **Adhesion** (cross-hatch method): Level 0-1 (seamless combination when the base surface treatment reaches the standard). - **Impact Resistance**: A 1kg steel ball can fall freely from a height of 1m without cracking/falling off. 

2. **Chemical resistance** - **Acid and alkali resistance**: 10% H₂SO₄ or 10% NaOH solution, no abnormality for 48 hours. - **Solvent Resistance**: Resistant to wiping with alcohol, gasoline, etc. (no change after ≥100 times). - **Oil stain resistance**: Oil stains can penetrate for 24 hours and are easy to clean without leaving any residue. 

3. **Physical Durability** - **Temperature Resistance**: Stable within the range of -30℃~120℃ (short-term high temperature resistance can reach 150℃). - **Weather Resistance**: UV resistant, not prone to yellowing when used outdoors (suitable for parking lots and outdoor venues). - **Flexibility**: No cracking when bent 180° (more resistant to micro-cracks than epoxy). 

4. **Environmental protection and constructability** - **VOC content**: Comply with national standard GB 30981-2020 (water-based type ≤ 100g/L, solvent type ≤ 420g/L). - **Curing time**: - Surface drying ≤ 1 hour, actual drying ≤ 24 hours, complete curing 4-7 days (specifically varies depending on temperature and humidity). 

5. **Appearance and thickness** - **Gloss**: Matte and semi-gloss are available (some models support self-leveling effect). - **Recommended film thickness**: The dry film thickness for single-pass construction is 60-100μm, and the total thickness is recommended to be 80-200μm. --- ### **

2. Construction precautions**

1. **Base surface treatment** - **Cleanliness**: There is no oil, dust, or loose layer on the base surface (it needs to be polished to a solid surface). - **Moisture content**: Concrete base ≤6% (much lower than the 8% requirement of epoxy). - **Smoothness**: The height difference of 2m is ≤2mm when measured with a ruler, otherwise it needs to be repaired or self-leveled. 

2. **Environmental requirements** - **Temperature**: 10-35℃ (construction is prohibited below 5℃ or above 40℃ to avoid poor curing). - **Humidity**: Relative humidity ≤70% (high humidity environment can easily cause the paint film to turn white and bubble). - **Ventilation**: Strong ventilation accelerates curing, but avoid direct blowing which may cause the surface to dry too quickly. 

3. **Material Preparation** - **Proportion**: The main agent and curing agent must be weighed strictly according to the manufacturer's proportion (error ≤ 2%). - **Mixing**: Stir the main agent first, then slowly add the curing agent and stir for 3 seconds