Brief description of glass fiber reinforced plastics

Time：2022-11-17 08:29:15 / Popularity： / Source：

Glass fiber reinforced plastic is based on original pure plastic, adding glass fiber and other additives to improve use range of material. Generally speaking, most of glass fiber reinforced materials are mostly used in structural parts of product, which is a kind of structural engineering material; such as: PP ABS PA66 PA6 PC POM PPO PET PBT PPS

Advantage:

1. After glass fiber is reinforced, glass fiber is a high temperature resistant material. Therefore, heat resistance temperature of reinforced plastics is much higher than that before glass fiber is not added, especially nylon plastics.
2. After glass fiber reinforcement, addition of glass fiber restricts mutual movement between polymer chains of plastic. Therefore, shrinkage rate of reinforced plastic is greatly reduced, and rigidity is also greatly improved.
3. After glass fiber is reinforced, reinforced plastic will not stress crack, and at the same time, impact resistance of plastic is greatly improved.
4. After glass fiber is reinforced, glass fiber is a high-strength material, which greatly improves strength of plastic, such as: tensile strength, compressive strength, bending strength, and greatly improved.
5. After glass fiber reinforcement, due to addition of glass fiber and other additives, combustion performance of reinforced plastics is greatly reduced, and most materials cannot be ignited, so it is a flame retardant material.

Shortcoming:

1. After glass fiber is reinforced, due to addition of glass fiber, it is transparent before adding glass fiber, and it will become opaque.
2. After glass fiber reinforcement, toughness of all plastics decreases, while brittleness increases.
3. After glass fiber is reinforced, due to addition of glass fiber, melt viscosity of all materials increases, fluidity becomes poor, and injection pressure is much higher than that without glass fiber.
4. After glass fiber is reinforced, due to addition of glass fiber, fluidity is poor. For normal injection molding, injection temperature of all reinforced plastics should be increased by 10℃-30℃ before adding glass fiber.
5. After glass fiber reinforcement, due to addition of glass fiber and additives, hygroscopic performance of reinforced plastic is greatly enhanced. Original pure plastic that does not absorb water will also become absorbent. Therefore, it must be dried during injection molding.
6. After glass fiber is reinforced, during injection molding process, glass fiber can enter surface of plastic product, making surface of product very rough and speckled. In order to achieve higher surface quality, it is best to use a mold temperature machine to heat mold during injection molding, so that plastic polymer enters surface of product, but appearance quality of pure plastic cannot be achieved.
7. After glass fiber is reinforced, glass fiber is a material with high hardness. After additives are volatilized at high temperature, it is a very corrosive gas, which causes great wear and corrosion to screw and injection mold of injection molding machine. When making molds and injection molding machines of materials, pay attention to surface anti-corrosion treatment and surface hardness treatment of equipment.

Physical Properties Mechanical Properties Injection Temperature See Table 1

Table 1 Glass fiber reinforced plastics-----physical and mechanical data 30%
			PP	ABS	PA66	PA6	PC	POM	NORYL	PET	PBT	PPS
1	Specific gravity	g/cm3	1.05-1.24	1.23-1.36	1.38	1.12-1.14	1.24-1.52	1.56	1.21-1.36	~~~	1.52	1.64
2	Water absorption	%	0.01-0.05	0.18-0.4	1	1.3-1.9	0.07-0.2	0.25-0.29	0.06	~~~	0.06	0.01
3	Transmittance	%	0	0	0	0	0	0	0	0	0	0
4	Surface hardness	R	R110	M65-100	M100	M100	M95	M79	L108	~~~	M90	R123
5	Shrinkage (range)	‰	2--8	1--2	5	4	1--3	9--12	6	~~~	2--8	2
6	Shrinkage (Moulding)	‰	~~~	~~~	~~~	~~~	~~~	~~~	~~~	~~~	~~~	~~~
7	Continuous heat resistance	℃	132	93-110	82-148	93-148	135	104	115-129	~~~	115-177	204-260
8	Heat distortion temperature	(18.6kg/cm2)℃	110-149	99-116	252	210	143-149	163	132-149	224	220	218
9	Heat distortion temperature	(4.6kg/cm2)℃	152-154	104-121	257	221	149-154	166	138-154	~~~	225	~~~
10	Tensile strength	kg/cm2	422-1020	598-1340	1550-1970	910-1760	840-1760	598-773	1020-1200	985-1150	1200-1340	1480
11	Tensile Strength Modulus	103kg/cm2	34.5-63.6	41.5-72.4	~~~	10.2-56.3	23.2-24.6	70.3	65-84.4	~~~	91.4	78.8
12	Elongation(%)	%	2.0-3.6	2.5-3.0	3--5	3	0.5-0.9	2--7	4--6	1.6-2.2	2--4	3
13	Flexural yield strength	kg/cm2	492-774	1125-1900	2880	1266-1265	950	1055	1300-1400	1510-3165	1830	2600
14	Flexural modulus of elasticity	103kg/cm2	26.7-60	21.1	91	105.5	98.4	77.4	77.4	~~~	77.4-84.4	155
15	Compressive strength	kg/cm2	387-492	844-1547	2070	1340	880	1270	1240-1260	1440-2005	1270-1580	~~~
16	Compressive elastic modulus	103kg/cm2	~~~	13.4	~~~	~~~	105	~~~	91.4	~~~	49.2	~~~
17	Cantilever Notch	lb.ft/in	1.5-5.0	1.0-2.4	2.2-2.6	3	12--18	0.8	0.3	~~~	1.3-1.6	0.8
18	Melting point	℃	105-120	170	264	220	230	163	220	250	230
19	Decomposition temperature	℃	300	260	360	320	360	240	360	360	300
20	Baking temperature	℃	50-60	70-85	100	100	120	60-80	120	120	100
21	Baking time	h	1	2--3	3--5	3--5	3--5	2--3	2--4	3--5	2--4
22	Injection temperature	℃	160-220	180-320	280-280	240-280	280-320	180-220	280-320	280-320	240-260
23	Mold temperature	℃	30-60	30-60	40-90	40-90	60-90	40-60	80-100	60-90	60-90
24	Can it be electroplated?		~~~	~~~	~~~	~~~	~~~	~~~	~~~	~~~	~~~

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