Description
Moisture curing silicone rubber (RTV-1) heat resistance up to 220 °C | ELASTOSIL® N189
Wacker ELASTOSIL® N189 BLACK is a non-slump, neutral-cure silicone sealant which cures at room temperature under influence of atmospheric moisture. It exhibits excellent primerless adhesion to many substrates and has good resistance to mineral oil and coolants ELASTOSIL® N189 BLACK moreover shows excellent heat stability.
Applications
- Automotive, Aerospace & Railway
- Formed-In-Place-Gaskets (Wet Type)
- Household Applications
- White Goods
Characteristics
- Good adhesion to metals, glass and ceramics
- Non-corrosive
- Coolant and oil resistant
- Excellent heat resistance up to 200 °C (392 °F), peak temperatures up to 220 °C (428 °F)
- Electrically ablative
- One-component
- Non-slump
- Coolant resistant
- Heat-resistant
- Oil resistant
Technical specifications
Uncured
| Color | black |
| Density 23 °C DIN EN ISO 1183-1 A | 1.07 g/cm³ |
| Viscosity, dynamic D = 0,5 1/s 25 °C DIN EN ISO 3219 | 900000 mPa·s |
| Viscosity, dynamic D = 25 1/s 25 °C DIN EN ISO 3219 | 100000 mPa·s |
| Skin formation time⁽¹⁾ | 15 min |
| Extrusion rate – mass flow⁽²⁾ internal method | 11 g/10s |
Cured
| Color | black |
| Density 23 °C DIN EN ISO 1183-1 A | 1.09 g/cm³ |
| Hardness Shore A DIN ISO 48-4 | 30 |
| Tensile strength⁽¹⁾ ISO 37 | 1.7 N/mm² |
| Elongation at break⁽²⁾ ISO 37 | 300 % |
| Volume resistivity⁽³⁾ IEC 62631-3-1 | 50 Ohmcm |
Curing conditions: 2 mm, 14 days storage at 23 °C and 50 % RH.
Storage
- 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.
Elastosil N-189, Elastosil N 189 Black,
Hazard Warnings (CLP)

Signal word: Danger
Hazard Statements (H-phrases)
- H350: May cause cancer.
- H371: May cause damage to organs (upper respiratory tract).
Safety Instructions (P-phrases)
Prevention:
- P201: Obtain special instructions before use.
- P280: Wear protective gloves/ protective clothing/ eye protection/ face protection.
- P260: Do not breathe vapour/aerosol.
Response:
- P314: Get medical advice/attention if you feel unwell.
Storage:
- P405: Store locked up.
Additional Information
- EUH208: Contains Methylbutan-2-on-trioximo-silan, 2-Butanone oxime, N-(3-(Trimethoxysilyl)propyl)ethylenediamine, Di-n-butyl tin dilaurate. May produce an allergic reaction.
- For professional use only.
Other Hazards
- During use of the product, 2-Butanone oxime (Methylethylketoxime, MEKO, CAS No. 96-29-7) is released and evaporates. 2-Butanone oxime is classified as hazardous to health.
- Endocrine-disrupting properties – human health: The substance/mixture does not contain components that are known to have endocrine-disrupting properties as per REACH Article 57(f) or the delegated regulations (EU) 2017/2100 or (EU) 2018/605 at levels of 0.1% or higher.
- Endocrine-disrupting properties – environment: The substance/mixture does not contain components that are known to have endocrine-disrupting properties as per REACH Article 57(f) or the delegated regulations (EU) 2017/2100 or (EU) 2018/605 at levels of 0.1% or higher.
Wacker Chemie AG, Gisela-Stein-Strasse 1, 81671 München, GERMANY, +49 89 6279-0, [email protected], www.wacker.com






Isabella Z. –
Not too big, not too small, just right. Looks even nicer in real life. I was skeptical, but now I’ll order regularly.
matteo_s –
Excellent product. Very stable.
andreas_s –
Everything was smooth and fast.
Ginevra V. –
The quality surprised me in a good way. Great product, worth every cent. Packaging slightly damaged, but the product is excellent.
Cédric M. –
Arrived without any defect. Quality is excellent. Everything perfect, would buy again.
nora.ber –
Looks even nicer in real life. Great product, worth every cent. Looks even nicer in person. Not too big, not too small, just right.
Anna C. –
Great product, worth every cent. I was skeptical, but now I’ll order regularly.
Marine –
It completely solved my problem!
Jana O. –
Looks even nicer in person. Easy to use, without making a mess.
pierre_fr –
Very robust product. Robust and well-made.