High Transparency Vacuum Casting Transparent PC

Composition			ISOCYANATE PX 5210	POLYOLPX 5212	MIXING
Mixing ratio by weight			100	50
Aspect			liquid	liquid	Liquid
Colour			transparent	bluish	transparent
Viscosity at 25°C                  (mPa.s)		BROOKFIELD LVT	200	800	500
Density at 25°C	(g/cm3)	ISO 1675 : 1985ISO 2781 : 1996	1,07-	1,05	1,06
Density of the cure product at 23°C
Pot life at 25°C on 150g       (min)		Gel Timer TECAM	8

Processing Conditions The PX 5212 must be only used in a vacuum casting machine and cast in a pre-heated silicone mould. The respect of 70°C temperature for the mould is imperative. Vacuum casting machine utilisation: • Heat both parts at 20 / 25°C in case of storage at a lower temperature. • Weigh isocyanate in the upper cup (do not forget to allow for residual cup waste). • Weigh polyol in the lower cup (mixing cup). • After degassing for 10 minutes under vacuum pour isocyanate in polyol and mix for 4 minutes. • Cast in the silicone mould, previously heated at 70°C. • Put in an oven at 70°C. 1hour for 3 mm thickness Open the mould, cooling the part with compressed air. Remove the part. Post curing treatment is needed to get final properties (after demoulding) 2h at 70°C + 3h at 80°C+ 2h at 100°C Use a fixture to handle the part during the post curing treatment NOTA: Elastic memory material offset any deformation observed during demoulding. It is important to cast the PX 5212 in a new mould without casting resin previously inside.

Hardness	ISO 868 : 2003	Shore D1	85
Tensile modulus of elasticity	ISO 527 : 1993	MPa	2,400
Tensile strength	ISO 527 : 1993	MPa	66
Elongation at break in tension	ISO 527 : 1993	%	7.5
Flexural modulus of elasticity	ISO 178 : 2001	MPa	2,400
Flexural strength	ISO 178 : 2001	MPa	110
Choc impact strength (CHARPY)	ISO 179/1eU : 1994	kJ/m2	48

Glass transition temperature (Tg)	ISO 11359-2 : 1999	°C	95
Refractive index	LNE	-	1,511
Coefficient og light transmission	LNE	%	89
Heat deflection temperature	ISO 75 : 2004	°C	85
Maximal casting thickness	-	mm	10
Time before demoulding at 70°C (3mm)	-	min	60
Linear shrinkage	-	mm/m	7

Storage Conditions Shelf life of both parts is 12 months in a dry place and in their original unopened containers at a temperature between 10 and 20°C. Avoid storage for long time at a temperature over 25°C. Any open can must be tightly closed under dry nitrogen. Handling Precautions Normal health and safety precautions should be observed when handling these products : Ensure good ventilation Wear gloves, safety glasses and waterproof clothes For further information, please consult the product safety data sheet.