Dow DOWSIL EA-3838 Fast Adhesive Base & Catalyst

Features Of Dow DOWSIL EA-3838 Fast Adhesive Base & Catalyst

1. Two-component, platinum-catalyzed addition-cure silicone system enabling rapid room-temperature or mild-heat cure.

2. Excellent adhesion to diverse substrates including metals, glass, ceramics, and engineered plastics without primers.

3. Low viscosity base component ensures easy mixing, degassing, and precision dispensing for automated assembly lines.

4. Exceptional thermal stability and long-term reliability across -55 °C to +200 °C operating range.

5. Low shrinkage and minimal outgassing—meets stringent requirements for optical, medical device, and electronics encapsulation.

Typical Applications Of Dow DOWSIL EA-3838 Fast Adhesive Base & Catalyst

1. LED packaging and secondary optics bonding in high-brightness lighting modules.

2. Encapsulation and structural bonding of automotive sensors (e.g., pressure, temperature, position sensors).

3. Medical device assembly requiring ISO 10993-compliant biocompatible adhesives and cleanroom processing.

4. Flexible printed circuit (FPC) lamination and touch sensor module bonding in consumer electronics.

5. Hermetic sealing of MEMS packages and microfluidic device housings.

Specifications Of Dow DOWSIL EA-3838 Fast Adhesive Base & Catalyst

Compatible Systems Of Dow DOWSIL EA-3838 Fast Adhesive Base & Catalyst

Dow DOWSIL EA-3838 Fast Adhesive Base & Catalyst – Frequently Asked Questions (FAQ)

Q1: What is the CAS Registry Number for DOWSIL EA-3838 Base and Catalyst components?

A: The Base component (Part A) has CAS No. 68037-54-3; the Catalyst component (Part B) has CAS No. 13981-65-2. Both are registered under the TSCA Inventory and EU EINECS.

Q2: What is the recommended minimum and maximum catalyst dosage when using EA-3838?

A: The standard mix ratio is strictly 10:1 (Base:Catalyst) by weight. Deviating below 9.5:1 or above 10.5:1 may result in incomplete cure, reduced crosslink density, or shortened pot life — no dilution or over-catalyzation is advised.

Q3: How does EA-3838 differ from DOWSIL™ EA-3837 in terms of cure speed and application scope?

A: EA-3838 offers faster room-temperature tack-free time (<15 min vs. >45 min for EA-3837) and higher thermal stability (200 °C continuous vs. 180 °C), making it preferred for high-reliability automotive and industrial electronics where rapid throughput and extended service life are critical.

Q4: Are there documented migration or extractables data for EA-3838 in contact with pharmaceutical or food-contact surfaces?

A: EA-3838 is not approved for direct food-contact or pharmaceutical primary packaging per FDA 21 CFR or EU 10/2011. Extractables testing per USP <87>/<88> is available upon request for specific curing conditions and substrate configurations — consult Dow Technical Service for qualification support.

Q5: Does EA-3838 require special handling for moisture or contamination sensitivity?

A: Yes — the platinum catalyst is highly sensitive to sulfur-, nitrogen-, phosphorus-, and heavy metal-containing contaminants (e.g., latex gloves, certain release agents, solder flux residues). Use nitrile gloves, stainless-steel tools, and cleanroom-grade solvents (e.g., isopropanol) for surface preparation.