AOC Palatal? EL-901 Saturated Polyester SMC/BMC Low Shrinkage Additive

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Saturated polyester type SMC/BMC low shrinkage additive
Palapreg? EL-901 is a special low shrinkage additive for Grade A surface SMC / BMC, the shrinkage of the product can be controlled at zero shrinkage or negative shrinkage, which is suitable for all kinds of products that have requirements for shrinkage or surface quality.

Characteristic performance

Very low viscosity

Class A surfaces

High-gloss surface

Excellent shrinkage effect

High heat/water/weather resistance

typical application

Palapreg? EL-901 is ideally suited for Grade A surface products or products with high surface brightness. The shrinkage of the product can be controlled at zero or negative shrinkage, which is suitable for a variety of products that require shrinkage or surface quality.Palapreg? EL-901 has very good heat, water and weather resistance, which can meet the requirements of some special products.
Automobile parts: all kinds of automobile exterior parts.
Electronic and electrical appliances: motor molded parts, precision injection parts.
Others: Products requiring shrinkage and brightness.

Product Indicators

performances	numerical value	unit (of measure)	Test Methods
exterior condition	quiet	-	TM_2265
Solid content	140-165	%	TM_2033
Infrared Drying Viscosity @23℃	39.5-41.5	mPa-s	TM_2013
acid value	4-7	mgKOH/g	TM 2401

Typical Properties of Liquid Resins

performances	numerical value	unit (of measure)	Test Methods
flash point	33	°C	TM 2800
Storage period, no polymerization inhibitor, protected from light	6 Months	-25 °C	-

SMC initial paste recommended formula

ingredient	numerical value
Palapreg? P 18-03	50
Palapreg? EL-901	50
TBPB	1.5
Zinc stearate	4.5
calcium bicarbonate Ca(HCO3)2	180
MgO paste (35% content)	2.5

Mechanical properties of SMC molded products

performances	numerical value	unit (of measure)	Test Methods
tensile strength	80	MPa	ISO 527-2
tensile modulus	9	GPa	ISO 527-2
Elongation at break	1.5	%	ISO 527-2
bending strength	175	MPa	ISO 178
bending modulus	3.9	GPa	ISO 178
shrinkage	-0.06	%	-
Glass fiber content	30	%	-

Process Operation Guide

Palapreg? EL-901 is typically used in conjunction with Palapreg? P 18-03 for the production of low shrinkage molding compounds. In general, the ratio of Palapreg? P 18-03 to Palapreg? EL-901 is 50:50, but can be adjusted according to the actual situation. Molding conditions are 140~160oC and 50~100kg/cm2 Depending on the dimensional requirements of the final product, 300ppm~600ppm p-benzoquinone can be added to the formulation (based on the total amount of resin and low shrinkage additive).

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