AOC PALAPREG® H 852-03 Low Shrinkage Additive for SMC/BMC with Low Surface Bump Float Grade A

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Chemical/Physical Properties

Palapreg® H 852-03 is a modified saturated polyester solution dissolved in styrene.

major application

For example, the combination of Palapreg® P18-03 and Palapreg® H852-03 is recommended for the production of low relief SMC/BMC parts with high surface quality (class A). The formulation can be easily thickened with magnesium oxide. Due to its excellent flowability in SMC, Palapreg® H 852-03 is well suited for low pressure applications.

The use of aluminum hydroxide as a filler makes it possible to produce molded products with high flame retardancy.

(an official) standard	grading
DIN 4102	B1
DIN 5510	S4, SR2, ST2
NF F 16-101	M1, F0
FAR 26.853, App. F, part IV (OSU) ASTM D 2863, LOI DIN 51 900, heat release	pass 100% 5 MJ/kg

Information on formulations is available upon request.

Product specifications at the time of delivery

causality	realm	unit (of measure)	Test Methods
Viscosity, 23°C	150 – 175	mPa.s	2013
Color, Gardner	0 – 4	–	2017
Solid content, IR	35 – 37	%	2033
exterior condition	Transparent - slightly hazy	–	2265
water content	0.0 – 0.1	%	2350
Acid value (so)	2 – 6	mg KOH/g	2401

Remarks: Viscosity: Z2/100/23°C Typical values Refractive index (23°C - TM 2150) = 1.5265 - 1.5295

Properties of liquid resins (typical values)

causality	numerical value	unit (of measure)	Test Methods
Density, 20°C	Approx. 1100	kg/m³	2160
flash point	Approx. 33	°C	2800
Stability, Not Started, Dark, 25°C	6	months	–

Properties of SMC molded products (typical values)

causality	numerical value	unit (of measure)	Test Methods
Glass content	30	%	–
bending strength	180	MPa	ISO 178
bending modulus	11.0	GPa	ISO 178
Outer fiber strain	2.5	%	ISO 178
tensile strength	100	MPa	ISO 527-2
Tensile modulus of elasticity	10.5	GPa	ISO 527-2
Elongation at break	1.7	%	ISO 527-2
Impact strength - unnotched specimen	85	kJ/m²	ISO 179
Molding Shrinkage	-0.07	%	DIN 53464

Typical starting formulations for SMC pastes

ingredient	weights
Palapreg® P 18-03	50
Palapreg® H 852-03	50
TBPB	1.5
Calcium carbonate	200
Zinc stearate	4
MgO-paste (35% MgO content) (MgO-paste (35% MgO))	2.5

Processing:

Palapreg® H852-03 is processed into low profile SMC (LP-SMC) and BMC with Palapreg® P18-03.Generally, the ratio of Palapreg® P 18-03/H 852-03 is 50:50, but this can be adjusted if necessary.The relatively low viscosity of Palapreg® H 852-03 permits the use of large amounts of filler. Depending on the size of the molded part, it is recommended that 300 to 600 ppm p-phenylenedione be added to the system (based on UP resin plus thermoplastic solution).

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