ALITA 239 Unsaturated Polyester Resin - High Reactivity & Excellent Colorability

Principal Properties & Application:

ALITA 239 resin is an isophthalic unsaturated polyester resin made mainly from isophthalic acid, with medium viscosity, high reactivity, and excellent colorability. ALITA 239 resin products have high mechanical strength, good chemical resistance, low sensitivity to fracture, and thus have a high fatigue life. Its product surface has excellent heat resistance and is suitable for pultrusion molding processes.

Liquid resin technical indicators:

Item	Scope	Unit	Test Method
Exterior	light yellow transparent liquid	-	-
acid value	27-31	mgKOH/g	GB/T 2895-2008
Viscosity, 25℃	0.6-0.7	Pa.s	GB/T 7193-2008
solid content	62-68	%	GB/T 7193-2008
Thermal stability, 80°C	≥24	h	GB/T 7193-2008
Gelation time, 25℃	4.0-6.0	min	GB/T 7193-2008

Note: Gel time test at 25°C: 25°C water bath, add 0.9g accelerator (1% Co) and 0.9g M-50 (Nouryon) to 50g resin.

Physical properties of the casting (for reference only):

Project	Typical Value	Unit	Test Method
Exterior	Casting without defects	-	-
Barcol hardness	42	-	GB/T 3854-2005
Heat distortion temperature	78	℃	GB/T 1634-2004
Elongation at break	3.5	%	GB/T 2567-2008
Tensile Strength	75	Mpa	GB/T 2567-2008
Tensile modulus	3400	Mpa	GB/T 2567-2008
Bending strength	128	Mpa	GB/T 2567-2008
Flexural modulus of elasticity	3700	Mpa	GB/T 2567-2008

Note:
The casting method is performed according to GB/T 8237-2005, curing system: promoter 0.6% Co Naph 1.0%, curing agent Enox BPO-50F 1%;
Casting: 4mm thick, post-curing conditions are: room temperature × 24h, 60℃ × 3h, 110℃ × 2h.

Usage instructions:

1. ALITA 239 resin does not contain wax, accelerator, or thixotropic agent.
2. The recommended curing system for pultrusion processes is BPO curing agent 0.5-2.0% and TBPB curing agent 0.5-1.5%. The actual selection should be based on specific equipment, products, process temperature, pultrusion speed, and other factors. When making thick products, it is recommended to add a low shrinkage agent to reduce the shrinkage rate.
3. For higher corrosion resistance requirements, it is recommended to choose epoxy vinyl ester ALITA 901 resin.

Handling and Storage:

This resin contains ingredients which could be harmful if mishandled. Contact with skin and eyes should be avoided and necessary protective equipment and clothing should be worn.
Drums - It is highly recommended that all material is stored at stable temperatures below 25°C (77°F). Avoid exposure to heat sources such as direct sunlight or steam pipes. To avoid contamination of product with water, do not store outdoors. Keep sealed to prevent moisture pick-up and monomer loss. Rotate stock.

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