also called SMC manhole cover,GRP manhole cover.They are fiber reinforced plastic manhole covers.
FRP Manhole Cover also called GRP manhole cover,mainly divided into SMC( Sheet Molding Compound)  and BMC( bulk molding compounds) covers accoding to material difference.They are both fiber reinforced plastic manhole covers.
FRP(Fiber reinforced plastic) is newly developed material of manhole covers.Before FRP came into existance,manhole cover were traditionally manufactured from concrete,steel fibre concrete,cast iron,ductile iron or PVC material,but these materials had their own shortcomings like low load carrying effciency.FRP is considered to be the best alternate material for manhole covers as it has longger lifespan and has the capacity to withstand heavy loads.Increase in heavy traffic and expensive metals completely replaced traditional covers with FRP manhole covers.
Advantages of FRP manhole cover making smc machine
Reasons for choosing FRP Manhole Covers over other ordinary covers are:

1. • Non recyclable which makes it of no value, hence eliminate incentive for stealing.
   • Resists weight for up to 40 tons.
   • Lightweight.
   • Bottom lid designed to maintain perfect fit and avoid displacement.
   • Non-Abrasive.
   • Resists bacteria and does not rot.

Specification of FRP SMC Manhole Cover 
All the sizes of manhole covers are available in the following load bearings:
1. 5 tons (A 15) / 2.5 tons / 5 tons / 10 tons / 12.5 tons (B 125) / 20 tons / 25 tons (C 250) / 40 tons (D 400)
 
Place of Manhole Cover Installation:
 
the appropriate class of manhole covers or gully gratings to be used depends on the place of installation.the various places of installtion have been dvided into groups numbered 1 to 6, as listed below.Figure 9a and figure 9b show the location of some of these groups in a highway envionment. 
Group 1(min.Class A15)
Areas which can only be used by pedestrians and pedal cyclists.
Group 2(min.Class B 125)
Footways,pedestrian areas and comparable areas,car parks,or car parking decks.
Group 3(min.Class C 250)
for gully tops installed in the area of kerbside channels of roads(Figure 9a) which when measured from kerb edge,extend a maximum of 0.5m into the carriageway and a maximum of 0.2m into the footway.
Group 4(min Class D400)
Carriageways of roads(including pedestrian streets),hard shoulders(Figure 9b) and parking areas, for all types of road vehicles.
Group 5(min. Class E600)
Areas imposing high wheel loads,e.g. Docks,aircraft pavements.
Group 6(min. Class F900)
Areas imposing particularly high wheel loads,e.g. Aircraft pavements. 

Circular	Rectangular	Square
300 mm	300 mm x 270 mm	300 mm x 300 mm
400 mm	600 mm x 450 mm	400 mm x 400 mm
500mm	700 mm x 500 mm	450 mm x 450 mm
600mm	800 mm x 450 mm	500 mm x 500 mm
690 mm	900 mm x 450 mm	600 mm x 600 mm
900 mm	900 mm x 600 mm	675 mm x 675 mm
1000 mm	990 mm x 1220 mm	750 mm x 750 mm
1100 mm	950mm x 750mm & 600mm x 750mm	800 mm x 800 mm
	(2 covers with single frame)
	675 mm x 2210 mm	900 x 900mm
	(3 covers with single frame)
	675 mm x 1440 mm	900 mm x 900 mm
	(2 covers with single frame)	(2 covers with single frame)
	800 mm x 1600 mm	1000mm x 1000mm
	(2 covers with single frame)
		1200mm x 1200mm
		1500mm x 1500mm

Our advantages for FRP manhole cover
(1) 4years' experience in fiberglass product trading, have good knowledge on process, quality control, request on different products, ready to offer international service for you.
(2) Complete production line from fiberglass sheet to mould and finished products,which keeps a better quality control and will also save cost for you.
(3) Hydraulic Press Machines with capacity from 60 to 2000 tons, which enable us to make products with maximum projected area of 4 square meters, so that we can meet your different size requirements.
(4) 150km away from Shanghai Port, which will shorten the delivery time and save freight cost for you.
Carriageways of roads(including pedestrian streets),hard shoulders(Figure 9b) and parking areas, for all types of road vehicles.
Group 5(min. Class E600)
Areas imposing high wheel loads,e.g. Docks,aircraft pavements.
Group 6(min. Class F900)
Areas imposing particularly high wheel loads,e.g. Aircraft pavements.