AOC Palapreg® P 133-952 High Gloss Surface SMC/BMC Molding Resin

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High-gloss surface SMC/BMC molding resin
Palapreg® P 133-952 is an unsaturated polyester resin of the maleic anhydride type with an excellent surface finish, mainly used for products requiring surface quality and gloss, as well as good water/weather resistance. Examples include sanitary ware, automotive panels, and medical devices.

Characteristic performance

Thickening and stabilization
Class A Surfaces
High surface gloss
High water resistance
Excellent stain resistance

typical application

Palapreg® P 133-952 is a resin designed for low profile and Class A surface SMC formulations. High surface quality molded products can be obtained in combination with low shrinkage additives such as H 892-02 for Class A surfaces.

Product Indicators

performances	numerical value	unit (of measure)	Test Methods
exterior condition	clear and muddy	-	TM_2265
Viscosity @23℃	900-1000	mPa.s	TM_2013
Solid content	58-62	%	TM_2033
Infrared drying acid value	11-16	mgKOH/g	TM_2401
Gel time	75-115	s	TM_2261

Notes:
TM2261: 130 °C
Reactivity test: 1.0g of TXC (Butanox®) in 100g of resin)

Typical Properties of Liquid Resins

performances	numerical value	unit (of measure)	Test Methods
flash point	33	°C	TM 2800
Storage period, no initiator added, protected from light, 25°C	3	moon	-

Typical Properties of Pure Resin Casting Body

performances	numerical value	unit (of measure)	Test Methods
tensile strength	58	MPa	ISO 527-2
tensile modulus	3.3	GPa	ISO 527-2
Tensile elongation at break	2	%	ISO 527-2
bending strength	115	MPa	ISO 1338
bending modulus	3.4	GPa	ISO 1338
heat distortion temperature	130	°C	ISO 75-2
Unnotched impact strength	10	kJ/m2	ISO 1339
barcolithic hardness	>40	Barcol	-

Notes:
Curing Conditions: Add 1.0 g of Curing Agent Butanox M50 with 1.0 g of Accelerator NL 49P to 100 g of resin. Cure at room temperature for 24 hours and post cure at 80°C for 24 hours.
Test conditions: temperature 23±2℃, relative humidity 50±5%

SMC initial paste recommended formula

ingredient	numerical value
Palapreg® P 133-952	60
Palapreg® H 892-02	40
TBPB	1.5
calcium bicarbonate Ca(HCO3)2	180
Zinc stearate	4.5
Magnesium oxide paste (35%MgO)	3

Mechanical properties of SMC molded products

performances	numerical value	unit (of measure)	methodologies
tensile strength	70	MPa	ISO 527-2
bending strength	160	MPa	ISO 1338
bending modulus	10	GPa	ISO 1338
impact strength	60	KJ/m²	ISO 1339
Glass fiber content	25	%	-

Process Operation Guide

Palapreg® P 133-952 is typically used in conjunction with low shrinkage additives such as H 892-02 to produce low profile or Class A surface articles. Depending on the dimensional needs of the final product, 300 to 600 ppm p-benzoquinone can be added to the formulation (based on the total amount of resin and low-shrinkage additive).

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