The relative density is between 1.5 and 2.0, which is only 1/4 to 1/5 of carbon steel. However, the tensile strength is close to or even exceeds carbon steel, and the specific strength can be compared with high-grade alloy steel. Therefore, it has excellent results in aviation, rockets, spacecraft, high-pressure vessels and other products that need to reduce their own weight. The tensile, bending and compressive strength of some epoxy FRP can reach more than 400Mpa.
	
	
		
			
				Fiberglass Rod 
			
		
		
			
				Diameter 
			
			
				Weight 
			
			
				Diameter 
			
			
				Weight 
			
		
		
			
				mm 
			
			
				inch 
			
			
				g/m 
			
			
				lb/ft 
			
			
				mm 
			
			
				inch 
			
			
				g/m 
			
			
				lb/ft 
			
		
		
			
				2 
			
			
				0.079 
			
			
				6 
			
			
				0.004 
			
			
				17.5 
			
			
				0.689 
			
			
				481 
			
			
				0.323 
			
		
		
			
				3 
			
			
				0.118 
			
			
				14 
			
			
				0.009 
			
			
				18 
			
			
				0.70…