ELASTOSIL® SOLAR 3210 A/B is a pourable addition curing RTV-2 silicone rubber for coating, lamination, encapsulation and molding purposes. The product vulcanizes at room temperature and under heat to yield a crystal clear silicone rubber with very high transmission and of medium hardness.


Cured ELASTOSIL® SOLAR 3210 A/B shows long-term stability against weathering, moisture and UV light. The silicone elastomer may continously be exposed to constantly changing climatic conditions, UV radiation and temperatures as high as 180 °C (356 °F) without damage.



  • 9:1 mixing ratio
  • medium curing speed at room temperature
  • rapid heat cure possible



  • medium hardness
  • crystal clear vulcanisate
  • excellent resistance to UV light
  • very high light transmission in the range of 250 nm to 1100 nm
  • recommended service temperature range:
    -50 °C to +180 °C

Spezifische Merkmale von ELASTOSIL® SOLAR 3210 A/B

  • elektrisch isolierend
  • hochtransparent
  • niedrige Viskosität
  • optisch klar
  • UV- & verwitterungsbeständig
  • UV-stabil
  • zweikomponentig
  • multi-purpose potting agent for the PV industry
  • encapsulation of solar cells
  • lamination of solar modules
  • bonding of optical devices
  • manufacture of molded articles by casting, e.g. Fresnel lenses and other optical devices


Only A and B components with the same batch number should be processed together!


Surface preparation:

All surfaces must be clean and free of contaminants that will inhibit the cure of ELASTOSIL® SOLAR 3210 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.



Caution! Component A of ELASTOSIL® SOLAR 3210 A/B contains the platinum catalyst, component B the crosslinker. Since even small quantities of crosslinker 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 9 : 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.



The curing time of addition-curing silicone rubber is highly dependent on temperature and both the size and the heat sink properties of the substrates used. ELASTOSIL® SOLAR 3210 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 the table "Properties Catalyzed A+B".


The reactivity of ELASTOSIL® SOLAR 3210 A/B can be adjusted within wide limits by adding WACKER® Catalyst EP or WACKER® Inhibitor PT 88 to suit the processing requirements of the particular application. WACKER® Catalyst EP increases reactivity, i. e. pot life and curing time are reduced. WACKER® Inhibitor PT 88 is a pot life extender and thus prolongs pot life and curing time.



ELASTOSIL® SOLAR 3210 A/B is colourless, transparent and crystal clear. If necessary, the product can be pigmented by adding up to 2 wt. % of ELASTOSIL® 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.



If removal of the silicone from machines or dispensing equipment is necessary, white spirit or similar nonpolar solvents are recommended. However, cleaning ideally should take place before the silicone is fully vulcanized. Cured silicone can be rubbed off and removed mechanically, if necessary in combination with a swelling agent (solvent).


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.

Vertrieb & Support

Wacker Chemie AG
Heilbronner Strasse 74
70191 Stuttgart
+49  711  61942-0 (Phone)
+49 711 61942-61  (Fax)

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