DOWSIL™ PR‑1204 RTV Prime Coat is a one-component, clear solvent-based primer solution. It contains silane coupling agents and is designed to enhance the adhesion of both RTV (room-temperature vulcanizing) and heat-cured silicone elastomers to substrates like metal, glass, ceramics, masonry, and certain plastics. Available in 309 g cans and 2.9 kg pails.
Key Features
Colorless/clear formulation for discreet application.
Enhances adhesion of RTV and heat-cure silicones across structurally difficult substrates (metals, masonry, glass, ceramics, FR‑4, etc.).
Flash point ~6 °C (naphtha-based solvent system) with low viscosity (≈1 at 25 °C).
Non-volatile content approximately 3–10 %; peel strength on aluminum ~40 lbs/in (~25 N/cm²).
Shelf life: about 540 days (≈18 months).
Applications
Construction / Glazing: Surface priming before silicone sealants applied to aluminum, glass, masonry, or concrete joints.
Electronics / PCB assembly: Promotes silicone adhesion to circuit boards (e.g. FR‑4 substrates).
Industrial & Aerospace bonding: Prepares structural metals, composites, and ceramics for silicone treatments in aerospace or heavy-duty equipment.
Safety & Handling Overview
Hazard class: UN1993 Flammable Liquid Class 3.
Hazard statements:
H225: Highly flammable liquid and vapour
H304: May be fatal if swallowed and enters airways
H315: Causes skin irritation
H318: Causes serious eye damage
H336: May cause drowsiness or dizziness
H361d: Suspected of damaging the unborn child
H373: May cause organ damage from repeated exposure
First-aid / PPE: Use gloves, goggles, and protective clothing. Avoid inhalation and contact. Wash thoroughly after handling.
Ventilation: Apply in well-ventilated areas to dissipate harmful vapours (vomiting, dizziness, respiratory irritation risk).
Storage & Disposal: Store below ~35 °C in sealed containers. Dispose according to local hazardous waste regulations.
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