KURALPHA™ AX grade (special high heat-resistant acrylic resin)

Special high heat-resistant acrylic resin KURALPHA™ AX grade

KURALPHA™ AX grades are special high heat-resistant acrylic resins manufactured using Kuraray's proprietary polymer synthesis technology. The material has a high heat resistance temperature (Tg over 140°C) comparable to that of polycarbonate resin, yet can be used outdoors and is easy to injection-mold. Its high rigidity, with a flexural modulus of 4,000 MPa, makes it easy to maintain the shape of parts.

Transparent material with high heat resistance temperature and discoloration resistance comparable to acrylic resin

KURALPHA™ AX grade is an acrylic resin with a heat resistance temperature equivalent to that of polycarbonate resin. This material is suitable for lens applications that require both high heat resistance and UV resistance.

Injection molding is possible and can be designed into various shapes

KURALPHA™ AX grades are thermoplastics that can be injection molded. It has the feature of maintaining transparency even when compounded with general-purpose PMMA, so it is possible to customize the moldability and other physical properties according to customer requirements.

High rigidity makes it easy to maintain the shape of parts

High rigidity with a flexural modulus of 4,000 MPa may reduce deformation of parts.

Can also be used for resin modification applications

KURALPHA™ AX grades can also be used for modifying resins by compounding. Compatibility with general-purpose PMMA allows for improved heat resistance temperatures while maintaining transparency. It can also be used for heat-resistant modification of ABS and ASA.

Physical Properties Data

Compared to HR-L (general PMMA).
Items: Total light transmittance, flexural modulus, deflection temperature under load (with annealing), MFR, pencil hardness

Test Item	Test procedure	Test conditions	Unit	HR-L (General PMMA)	KURALPHA™ MX (Developmental product)	KURALPHA™ AX (Development product)
Total Light Transmittance	ISO 13468-1	3 mm	%	92≦	92	up to 90
Flexural Modulus	ISO 178	2 mm/min	MPa	3,300	3,400	3,500-4,000
Flexural Strength	ISO 178	2 mm/min	MPa	114	-	-
Tensile Strength	ISO 527-2	1A/5	MPa	77	-	-
Charpy Impact Strength (Notched)	ISO 179	1eA	kJ/m²	1.4	1.3	1.4
Deflection Temperature Under Load (Annealed)	ISO 75-1/2	1.8MPa	℃	101	112	135-140
Vicat Softening Temperature	ISO 306	50°C/h, 50N	℃	110	116	135-140
MFR	ISO 1133	230°C 3.8 kg load	g/10min	2.4	6.0	1.5-2.0
Pencil Hardness	-	-	-	2H	F	2H-3H
Coefficient of Linear Expansion	-	-	1/°C	6 × 10^-5	6 × 10^-5	5 × 10^-5
Saturated Water Absorption	-	23 °C	%	2.0	1.1	1.8