U.S.A Access Cover and Frame Loading Test AASHTO (American Association of State Highway and Transportation Officials ) Standard Specifications for Highway Bridges.  H-20 and HS-20 :A 40,000 pound proof load concentrated on a nine inch by nine inch square area and held for one minutes. The 40,000lbs. proof load respresents a safety factor of 2.5 for H-20 and HS-20 loading. H-25 and HS-25 : A 50,000 pound proof load concenrated on a nine inch by 22 nine inch square area and held for one minute. The 50,000lbs. proof load represents a safety factor of 2.5 for H-25 and HS-25 loading. Test Procedure 1.Test specimen is placed in the hydraulic test press and the 9 in.by 9 in.test foot print is centered on the specimen. 2.Pressure is aplied to the specimen until the desired test load is achieved. The test load is then maintained for 60 seconds. 3.Upon removal of the load, the cover and frame shall be examined for cracks or detrimental permanent deformation. Permanent deformation shall not exceed 3.2mm. 4.Test specimen is then removed from the press and examined for any detrimental deformation. 5.Test specimen is then placed back into test press and loaded to full destructive failure-destructive test loading available upon request. For more details , please contact us freely. 

All of our composite access covers, manhole covers in round, square and rectangular, gully gratings and frames, gully tops, rain gratings, inspection Chambers, recessed access covers, Bridge Drainage and Tank Sumps etc are made of composite SMC(sheet moulding compound), SMC is Unsaturated polyester resins reinforced with glass fibers. What is the Sheet Molding Compounds (SMC) SMC is an abbreviation for Sheet Molding Compound, which is a high strength glass fiber reinforced thermoset,moulding material which is normally compression moulded. It combines glass fiber and unsaturated polyester/ phenolic/ Vinyl and Acrylic modified resins, fillers(Calcium carbonate), catalysts, pigments and stabilizers, release agents to produce a high strength moulding compound. Glass reinforcement is between 10% and 60%, and glass length is between 1/2-inch and 1-inch (25mm). Manufacture of sheet molding compounds is a continuous in-line process. The material is sheathed both top and bottom with a polyethylene or nylon plastic film to prevent auto-adhesion. The paste is spread uniformly onto the bottom film. Chopped glass fibers are randomly deposited onto the paste. The top film is introduced and the sandwich is rolled into a pre-determined thickness. The sheet is allowed to mature for 48 hours. Delivered as sheet usually 2.5-6mm and 1000-1200mm wide. SMC is ideal for large structural components due to its high strength-to-weight ratio. SMC offers additional benefits in part design allowing localised rib reinforcement and bosses for fastening attachments and sub assemblies. Significant tooling investment and overall component cost savings result from part consolidation. With the same coefficient of thermal expansion as Steel and excellent corrosion resistance, SMC is an ideal alternative to Steel and can be used in the same fluctuating temperature environments. The main benefit however is a typical 25% weight reduction achieved at similar strength to Steel. The heat stability, mechanical and electrical properties of SMC are key attributes to its success in a number of industries including the automotive sector where it is commonly used in painted body panels, lightweight structural panels such as bumpers, valve covers, and engine shields. SMC is also extensively used in the production of electrical enclosures, lighting, solar, shower bases, walls, and sinks. SMC Manufacturing Process Manufacturing process including pulping, premix, placing glass fibers, steeping and rolling etc. Why SMC material is superior ? All parts of our covers are used high strength of thermoset SMC composites which made by our company. SMC—Sheet Moulding Compounds, Refers to the reinforced unsaturated glass fiber resin sheet molding compound  which is mainly composed of unsaturated resin, glass fiber, filler and functional additives, is one kind of high performance composites used for compression molding. The main components including glass fiber, unsaturated polyester resi...

M&C’s complete range of SMC composite Access Covers, Gully Grates and Frames are designed and tested in accordance with the Australian Standard AS3996:2006 or European standard EN124:1994. The following table provides an overview of loading classes, its typical use and loading capacity. Appropriate class for a cover or grate depends upon the place of installation. Contact our sales office for further information regarding selection of the appropriate class rating. EN124 : 1994 – European Standard Load Classification EN 124 divides Manhole Covers and Drainage Gratings into 6 classes as follows : A15, B125, C250, D400, E600 and F900. The classification denotes the test load expressed in kN. Type testing under The European Standard EN124:1994 requires the Access Covers to meet the Minimum Design Load (kN) without exceeding the Permissible Permanent Set values. Refer to EN124:1994 subclause 8.3. for further details. Contact us by E-mail: info@mcovers.com or call us +86 18058395188 for assistance on product selection. Areas imposing particularly high wheel loads, e.g.aircraft pavements. Class Rating Typical Use Norminal Wheel Load(kg) Servicibility Design Load(KN) Ultimate Limit State Design Load(KN) A Areas which can only be used by pedestrians and pedal cyclists. 330 10 15 B Footways, pedestrian and comparable areas, car parks or car parking decks. 2670 83 125 C For gully tops installed in the area of kerbside channels of roads which when measured from the kerb edge, extend a maximum of 0,5m into the carriageway and a maximum of 0,2m into the footway. 5000 167 250 D Carriageways of roads (including pedestrian streets),hard shoulders and parking areas, for all types of road vehicles. 8000 267 400 E Areas imposing high wheel loads, e.g. docks, aircraft pavements. 20000 400 600 F Areas imposing particularly high wheel loads, e.g.aircraft pavements. 30000 600 900 NOTE: A force of 1 kN is approximately equal to the weight of 100kg. AS3996 : 2006 – Australian Standard Load Classifications The Australian Standard, AS3996:2006 is GATIC’s nominated standard for projects/applications within Australia. Type testing under AS3996:2006 requires the Access Covers to meet the Ultimate Limit State Design Load (kN) without exceeding the Permanent Set and Deflection Limits. Refer to AS3996:2006 subclause 4.2.1. for further details. Class Rating Typical Use NOMINAL WHEEL LOAD (kg) SERVICEABILITY DESIGN LOAD (kN) ULTIMATE LIMIT STATE DESIGN LOAD (kN) AS3996 WSAA AS3996 WSAA AS3996 WSAA A Areas (including footways) accessible only to pedestrians and pedal cyclists and closed to other traffic (extra-light duty) 330 330 6.7 6.7 10 10 B Areas (including footways and light tractor paths) accessible to vehicles (excluding commercial vehicles) or livestock (light duty) 2670 2670 53 54 80 82 C Malls and areas open to slow moving commercial vehicles (medium duty) 5000 5000 100 100 150 150 D Carriageways of roads and areas open to commercial vehicles (heavy duty) 8000 7000 14...