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SEMICOSIL® 986/1K is a non-slump, thermally curable, addition curing one-part silicone rubber.


  •  ready-to-use, one-part system
  •  thixotropic
  •  translucent
  •  medium hardness
  •  high flexibility (low-stress-adhesive)
  •  primerless adhesion to many substrates
  •  rapid heat cure
  •  ultraviolett fluorescing


All the information provided is in accordance with the present state of our knowledge. Nonetheless, we disclaim any warranty or liability whatsoever and reserve the right, at any time, to effect technical alterations. The information provided, as well as the product's fitness for an intended application, should be checked by the buyer in preliminary trials. Contractual terms and conditions always take precedence. This disclaimer of warranty and liability also applies particularly in foreign countries with respect to third parties' rights.

  •  general purpose adhesive for the electronics industry
  •  FIPG applications

Surface preparation
All surfaces must be clean and free of contaminants that will inhibit the cure of SEMICOSIL® 986/1K. 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.

Because of the thixotropy (shear thinning effect) SEMICOSIL® 986/1K can be dispensed easily with all dispensing equipments. Since silicones dissolve notable amounts of air, an in-line degassing is recommended.

SEMICOSIL® 986/1K works best when cured at 115 °C or more depending on the size and heat sink properties of the components.

Temperature Curing time, thickness 10 mm
100°C 6 h
130°C 30 min
150 °C 10 min

SEMICOSIL® 986/1K shows good primerless adhesion to many substrates. We recommend running preliminary tests to optimize conditions for the particular application.


The 'Best use before end' date of each batch is shown on the product label.

SEMICOSIL® 986/1K should be stored  between +5 and +25°C in its tightly closed containers.

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.

Sales and support

Wacker Chemical Corporation
3301 Sutton Road
Adrian 49221-9397
United States
+1  888  922-5374 (Phone)
+1 517 264-8246  (Fax)
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