Dowsil 3140 RTV Coating — Clear/Translucent, 310ml Cartridge

Dowsil 3140 RTV Coating — Clear/Translucent, 310ml Cartridge

What Is Dowsil 3140 RTV Coating?

Dowsil 3140 RTV Coating — also known as Dow Corning 3140, and widely referred to as an RTV conformal coating, flowable silicone protective coating, or UL 94 V-1 circuit board coating — is a one-part, translucent polydimethylsiloxane adhesive coating by Dow Corning, engineered to protect corrosion-sensitive electronic components and rigid or flexible circuit boards through a good-flowability, self-leveling application that ensures thorough pin, solder joint, and thin-section coverage. Formulated with no added solvents and curing at room temperature on exposure to atmospheric moisture, Dowsil 3140 eliminates the need for curing ovens while delivering flame resistance and Mil Spec compliance for demanding electronics manufacturing and protective coating applications.

Tested to UL 94 V-1, IPC-CC-830, Mil-I-46058C, and MIL-A-46146, Dowsil 3140 combines a tensile strength of 434 psi with 419% elongation and excellent electrical insulation properties — dielectric strength of 385 V/mil (15 kV/mm) and volume resistivity of 2.1×10¹⁴ ohm·cm — making it a reliable conformal coating for protecting PCBs and electronic assemblies against moisture, contamination, and corrosion in demanding operating environments. Available in a 310ml cartridge and a 90ml tube, Dowsil 3140 is trusted by electronics manufacturers and MRO facilities across the UAE, Saudi Arabia, Qatar, Oman, Kuwait, and Bahrain. Maisam Trading LLC is the authorised Dowsil supplier in Dubai, with stock available for prompt delivery across the entire GCC region.

Description

Dowsil 3140 RTV Coating is the benchmark one-part flowable silicone conformal coating for corrosion-sensitive electronic component protection, available from Maisam Trading LLC Dubai in a 310ml cartridge. The clear to slightly hazy, smooth viscous liquid (34,400 cP) is applied by brush, flow, or syringe/needle to flow, fill, and self-level over the substrate — providing improved pin and solder joint coverage and reliable thin-section encapsulation that manual application methods often struggle to achieve consistently.

As a one-part moisture-cure adhesive, Dowsil 3140 cures at room temperature in an environment of 30 to 80 percent relative humidity, reaching greater than 90% of full physical properties within 24 to 72 hours; handling times of about 10 to 120 minutes can typically be achieved, and optional mild heat below 60°C (140°F) can be used to accelerate throughput further. As cure progresses from the exposed surface inward at approximately 0.25 inch per seven days, this product is not intended for highly confined spaces or deep-section cure applications. The cured coating provides unprimed adhesion to many reactive metals, ceramics, glass, and selected laminates, resins, and plastics — though non-reactive substrates such as Teflon, polyethylene, and polypropylene typically require chemical etching, plasma treatment, or a compatible primer to achieve good adhesion. Surfaces should be thoroughly cleaned and degreased with Dow Corning OS Fluids, naphtha, mineral spirits, or MEK prior to application, with light surface abrasion recommended where possible; acetone and IPA alone do not effectively remove oils. The cured coating is generally usable over -45°C to +200°C, with thermal cycling to -55°C possible where verified for the specific assembly. This product is intended only for splash or intermittent solvent exposure, not continuous exposure, and is not tested or represented as suitable for medical or pharmaceutical use. As a trusted Dowsil 3140 supplier in Dubai and across the GCC, Maisam Trading LLC provides prompt delivery and B2B supply to industrial and electronics customers across UAE, Saudi Arabia, Qatar, Oman, Kuwait, and Bahrain.

Features & Benefits

• Good flowability — flows, fills, and self-levels after dispensing
• Room temperature cure — no ovens required
• No added solvents
• No mixing required
• UL 94 V-1, IPC-CC-830, Mil-I-46058C, and MIL-A-46146 tested
• Faster in-line processing with optional heat acceleration
• Improved pin and solder joint coverage
• Suitable for thin-section encapsulation and pin sealing
• Excellent dielectric properties
• Retains original physical and electrical properties across a broad operating range

Applications

• Protection of corrosion-sensitive electronic components
• Protection of rigid and flexible circuit boards
• Improved pin/solder joint coverage
• Thin-section encapsulation
• Pin sealing
• Conformal coating for PCB and electronic assembly protection

Industries Served

• Electronics & Electrical Manufacturing
• PCB Assembly & Circuit Protection
• Telecommunications & Data Communications
• Aerospace & Defence
• Industrial Automation & Controls
• Oil & Gas Instrumentation

Why Buy from MAISAM TRADING LLC?

• 18+ years of experience supplying Dowsil and Dow Corning silicone products across the GCC
• Available in 310ml cartridge and 90ml tube
• Dedicated B2B support and technical guidance
• Prompt delivery and export solutions across UAE, Saudi Arabia, Qatar, Oman, Kuwait & Bahrain
• Verified stock of original Dowsil (Dow Corning) products
• Call: +971521672252 | Email: sales@maisamdubai.com

Technical Specifications

FAQs

Q1: What is Dowsil 3140 RTV Coating used for?
Dowsil 3140 is a one-part flowable silicone coating used to protect corrosion-sensitive components, protect rigid and flexible circuit boards, improve pin and solder joint coverage, and provide thin-section encapsulation and pin sealing in electronics manufacturing.

Q2: Does Dowsil 3140 require mixing?
No. It is a one-part system that cures at room temperature through moisture in the air — no mixing or curing ovens are required.

Q3: How long does Dowsil 3140 take to cure?
It is tack-free in approximately 116 minutes at 25°C. Greater than 90% of full physical properties are typically achieved within 24 to 72 hours at 30–80% relative humidity. Optional mild heat below 60°C can accelerate handling times to about 10 to 120 minutes.

Q4: Is Dowsil 3140 flame resistant?
Yes. It is tested to UL 94 V-1 at 1.4mm and UL 94-HB at 1.9mm, and complies with Mil-I-46058C and MIL-A-46146, making it suitable for applications requiring added flame resistance and Mil Spec testing.

Q5: What is the service temperature range?
For most uses, the cured coating is operational from -45°C to +200°C. Thermal cycling to -55°C may be possible but should be verified for specific parts or assemblies.

Q6: How is Dowsil 3140 applied?
It can be applied by brush, flow, or syringe/needle, and is able to flow, fill, or self-level after dispensing for consistent coverage over components and circuit boards.

Q7: What substrates does Dowsil 3140 bond to without primer?
Unprimed adhesion is achieved on many reactive metals, ceramics, glass, and selected laminates, resins, and plastics. Non-reactive substrates such as Teflon, polyethylene, and polypropylene generally require chemical etching, plasma treatment, or a primer for good adhesion.

Q8: Is Dowsil 3140 suitable for deep-section or confined space applications?
No. The coating cures from the exposed surface inward at approximately 0.25 inch per seven days and is not typically used in highly confined spaces or where deep-section cure is required.

Q9: What pack sizes are available?
Dowsil 3140 is available in a 310ml cartridge and a 90ml tube from Maisam Trading LLC.

Q10: Where can I buy Dowsil 3140 in the UAE or GCC?
Maisam Trading LLC is a trusted Dowsil supplier in Dubai. Contact +971521672252 or email sales@maisamdubai.com. We supply across UAE, Saudi Arabia, Qatar, Oman, Kuwait, and Bahrain.

Availability & Support

Dowsil 3140 RTV Coating 310ml is available across Dubai and all major GCC electronics, industrial, and maintenance supply networks through Maisam Trading LLC.

Call / WhatsApp: +971521672252
Email: sales@maisamdubai.com for quotes, TDS, SDS, or bulk order pricing