SOLAR 222 A/B

SPECIFIC FEATURES

• Electrically insulating
• Highly transparent
• Optically clear

APPLICATIONS

• Encapsulation

APPLICATION DETAILS

• Multi-purpose potting agent for the PV industry
• Encapsulation of electronic components (e.g. junction boxes or power inverters)
• Encapsulation of solar cells
• Lamination of solar modules
   

UNCURED:

• 1 : 1 mixing ratio
• Medium curing speed at room temperature
• Rapid heat cure possible

CURED:

• Very low hardness (silicone sealant)
• Crystal clear vulcanisate
• Very high light transmission in the range of 250 nm to 1100 nm
• Excellent resistance to UV light
• Pronounced inherent tack
• Recommended service temperature range: -50 °C to +160 °C
• UL 94 HB listed
   

Surface preparation:

All surfaces must be clean and free of contaminants that will inhibit the cure of ALSTONE SOLAR 222 A/B. Examples of inhibiting contaminants are sulfur containing materials, plasticizers, urethanes, amine containing materials and organometallic compounds – especially organotin compounds. If a substrate’s ability to inhibit cure is unknown, a small scale test should be run to determine compatibility.

MIXING:

Caution! Component B of ALSTONE SOLAR 222 A/B contains the platinum catalyst, component A the crosslinker. Since even traces of platinum catalyst may cause gelling of component A, all tools (e.g. spatula, stirrers, mixing cups etc.) used for handling either component B or the A/B mix must not come into contact with component A by mistake.
The two components should be thoroughly mixed at a 1 : 1 ratio by weight or volume, either manually or by automatic metering lines equipped with static or dynamic mixing devices.

MATERIAL APPLICATION:

To eliminate any air introduced during dispensing or trapped under components or devices a vacuum encapsulation is recommended. Alternatively, component A and B can be deaerated individually prior to use to remove absorbed air; applying a vacuum of 25-50 mbar for 10-15 min is recommended.

CURING:

The curing time of addition-curing silicone sealant is highly dependent on temperature and both the size and the heat sink properties of the components being potted. ALSTONE SOLAR 222 A/B cures both at room temperature and under heat. General information about pot life, typical curing temperatures and resulting curing times are given in table "Properties Catalyzed A+B".
The reactivity of ALSTONE SOLAR 222 A/B can be adjusted within wide limits by adding ALSTONE Catalyst EP or ALSTONE Inhibitor PT 88 to suit the processing requirements of the particular application. ALSTONE Catalyst EP increases reactivity, i. e. pot life and curing time are reduced. ALSTONE Inhibitor PT 88 is a pot life extender and thus prolongs pot life and curing time.

MODIFYING SOFTNESS:

If the gel is too soft and tacky, reducing the amount of component B results in a harder, less tacky vulcanizate. A tough gel is obtained with a mixing ratio for A:B of 1.25:1, while a mixing ratio of 1.5:1 yields a very soft rubber. Please note: for logistical reasons however, we can only accept orders in a mixing ratio of A:B = 1:1.

PIGMENTATION:

ALSTONE SOLAR 222 A/B is colourless, transparent and crystal clear. If necessary, the product can be pigmented by adding up to 2 wt. % of ALSTONE COLOR PASTE FL.
Detailed information about processing, modifying curing speed and pigmentation is given in our brochure “ROOM TEMPERATURE VULCANIZING (RTV) SILICONES - MATERIAL AND PROCESSING GUIDELINES”. We recommend running preliminary tests to optimize conditions for the particular application.

PACKAGING AND STORAGE

STORAGE

• Store in a dry and cool place.
• The 'Best use before end' date of each batch is shown on the product label.
• Storage beyond the date specified on the label does not necessarily mean that the product is no longer usable. In this case however, the properties required for the intended use must be checked for quality assurance reasons