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Technical parameters Test load: heavy 400KN, general 250KN, light 125KN 
Bending strength: average 22MPa impact strength: average 10J / m2
Water absorption: 1%
Acid resistance: sample at 20%
Soak in sulfuric acid solution for 48h
No corrosion on the surface, 1% quality loss
1. High strength: Magnesite inspection has high compressive, bending and impact strength, and toughness. After long-term use, the product will not be crushed and damaged, which can completely prevent the "urban black hole" accident.
2. Beautiful appearance: The surface pattern design of magnesite inspection manhole cover is exquisite, the color is adjustable, and it can beautify the urban environment.
3. Easy to use and light weight: The product weighs only about one third of cast iron, which is convenient for transportation, installation and repair, which greatly reduces labor intensity.
4. Anti-theft: Magnesite inspection manhole cover has no recovery value and is natural anti-theft; according to customer requirements, a lock structure is provided to prevent theft of property in the well.
5. Strong weather resistance: Magnesite inspection manhole cover can be used normally in the environment of －50 ℃ ～ + 300 ℃ through scientific formula, advanced technology and perfect technical equipment.
6, acid and alkali resistance, corrosion resistance, wear resistance, rolling resistance of vehicles, long service life.