common sense of fiber glass
About the method of making glass fiber in our country at present, there are two main types: one is the generation of platinum crucible method. Make the glass into balls, put the ball into the crucible furnace of the leaking plate made from platinum rhodium, and the glass fluid will flow from many discharge spouts on the leak plate winding wire tube rotation (linear velocity of about 3000 m per minute) at high speed; Second, pool kiln method. Put the glass powder material directly into the melting tank furnace, and the glass liquid will flow from the discharge spout installed on several separation plates, like the previous drawing method.

Drawing have all platinum crucible, generation of platinum (leakage board is made of platinum only) and clay crucible. Furnace of the pool comes later. Platinum here refers to platinum rhodium containing 7%-10% rhodium. Adding the rhodium can improve melting point of the leakage and mechanical strength.

There is no glass without alkali entirely. The content of alkaline impacts the performance of glass fiber. According to the content of the alkali metal oxide (R2O represent the Na2O and K2O), fiberglass is roughly divided into three types:
(1) non-alkali fiber, code E, R2O≤ 0.8%;
(2) medium-alkali glass fibre, code-named C, R2O = 12%; - also known as platinum cloth
(3) with alkaline fiber, code A, R2O = 14.2%; - commonly known as hand woven cloth
A fiber composition is the same as the composition of flat glass, glass bottle.

fiber glass composition/%

model SiO2 Al2O3 CaO MgO B2O3 R2O Femon others
non-alkali fiber1# 54.1±0.5 14.6±0.4 16.6±0.3 4.6±0.3 8.8±0.5 <0.8 <0.5 margin
medium-alkali glass fibre5# 56.7±0.5 6.2±0.4 9.5±0.3 4.2±0.3 12±0.4 <0.4 margin
with alkaline fiber 72 0.6 10 2.5 14.2    

Note: the FeO content shall not exceed 40% of the content of Fe mon.

E fiber in our country is aluminum borosilicate, and C fiber is calcium sodium silicate. The performance of E fiber good with ageing resistance, bibulous rate low and intensity is high. The performance is better than that of C fiber, but the price is more expensive; C fiber has good acid resistance performance and cheap. Other performance is lower than that of E fiber; A fiber aging resistance is poor, and poorer that C fiber on acid. Another kind of high strength fiber - S. The density of S fiber is 20%smaller than the density of E fiber, and 35% higher on the tensile strength, 20% higher on elastic modulus, which is more used for the winding manufacture of FRP.