The HB Fuller Bacon Adhesives LCA-4 Kit is a two-part, low-viscosity, clear epoxy adhesive and encapsulating compound formulated for high-reliability aerospace, optoelectronic, and microelectronic applications. Engineered for applications requiring optical clarity, low outgassing, and minimal thermal contraction, the LCA-4 system provides exceptional bond strength to glass, quartz, metals, ceramics, and rigid plastics. Curing at room or elevated temperatures, LCA-4 maintains high dielectric strength and chemical resistance across demanding thermal cycles (-65°F to 300°F). Ideal for bonding glass covers, sealing optical sensors, encapsulating LED arrays, and staking micro-components in flight deck instruments and satellite payloads.

Technical Specifications & Chemical Properties

• Manufacturer / Brand: HB Fuller / Bacon Adhesives
• Product Name / Part Number: LCA-4 Kit (Liquid Resin & Hardener)
• Chemical System: Two-Part Unfilled Clear Epoxy System
• Mix Ratio (Resin to Hardener): 100 : 8.5 by weight
• Viscosity (Mixed): Low viscosity (~300 to 600 cPs) for excellent penetration and bubble-free potting
• Optical Clarity: Clear to light straw liquid with high light transmission post-cure
• Operating Temperature Range: -65°F to 300°F (-54°C to 149°C) post-cure continuous service
• Cure Schedule: 24 hours at 77°F (25°C) or 2 hours at 150°F (65°C) for accelerated processing
• Shore D Hardness: ~85 Shore D

Approved Specifications & Aerospace Conformance:

The HB Fuller Bacon Adhesives LCA-4 Kit meets rigorous defense and space qualification baselines:

• NASA Outgassing Conformance: Fully tested to ASTM E595 standards (TML < 1.0%, CVCM < 0.10%) for low-outgassing optical and spaceflight applications.
• Military Avionics Qualified: Meets major defense contractor process standards for optoelectronic sealing and glass-to-metal bonding.
• Environmental Resistance: Resists moisture absorption, jet fuel, synthetic lubricants, and mild solvents without clouding or bond degradation.

Key Features & Performance Benefits

• Low-Outgassing Optical Formulation: Prevents lens fogging and volatile condensation on sensitive optical sensors in high-vacuum or sealed avionics enclosures.
• Ultra-Low Viscosity & Deep Penetration: Flows effortlessly into narrow gaps and complex microelectronic assemblies for void-free encapsulation.
• High Dielectric Isolation: Shields delicate electronic circuits and optical sensors from electrical breakdown and stray voltage leakage.
• Excellent Dimensional & Thermal Stability: Maintains structural bond integrity and optical clarity under severe thermal shock and flight vibration.

Typical Applications

• Optoelectronic & Display Assembly: Lamination and bonding of glass faces, optical filters, lenses, and display windows on flight deck screens.
• Sensor Encapsulation & Sealing: Potting and sealing IR sensors, photodetectors, laser optics, and fiber optic interconnects in missile guidance and aerospace systems.
• Microelectronic Component Staking: Securing delicate wire bonds, quartz crystals, and surface-mount devices on PCB assemblies.

• All in-stock orders are processed within 1–2 business days (excluding weekends and holidays) after receiving your order confirmation email.
• Orders with a lead time will ship according to the estimated shipping time shown on the product page.
• If we experience a high volume of orders or if an item is backordered, processing times may be slightly delayed. We will notify you promptly via email.

• Returns and damage claims must be made within a maximum of 3 business days after receiving the product, with prior authorization from Aircraft Shop Supply (Return Material Authorization - RMA). Returns without prior notice or written authorization will not be accepted. We strongly recommend inspecting the product upon delivery; many products require special storage conditions for which we are not responsible once they arrive to the client's facility. Please review the product's SDS for proper storage and handling.
• For products with 3 to 6 months of remaining shelf life, claims must be made within the next 2 business days after receipt.
• Returns are not accepted for products with less than 3 months of remaining shelf life.
• Returns are not accepted for products purchased during a low Shelf Life promotion, items sold with discounts, or special orders that must be placed directly with the factory.
• The customer is responsible for the return shipping cost, except in cases where the return is due to an error on the part of Aircraft Shop Supply.
• Refunds will only be issued after the product has been inspected and no damage is found.
• A 25% Restocking Fee will be charged for returns of products in good condition that are either no longer needed or were ordered incorrectly.
• A 35% Restocking Fee will be charged for returns of products with one year or less of remaining shelf life.
• No Restocking Fee will be charged if Aircraft Shop Supply is responsible for incorrectly shipping a product, or if the order is damaged upon leaving the warehouse.
• Hazardous Materials & Dangerous Goods: These items are sold as final and are not eligible for return approval.

At Aircraft Shop Supply, we are committed to shipping the highest quality and freshest product possible. To ensure efficient stock rotation and meet aviation industry standards, our inventory management is governed by the following policy:

1. Scope of Application
All Sales Channels: This policy applies to all orders processed by Aircraft Shop Supply, including but not limited to: website purchases, direct email orders, formal Purchase Orders (POs), phone orders, and contract agreements.

2. Inventory Management (FIFO)
All products with an expiration date are managed and shipped on a strict "First In – First Out" (FIFO) basis.

3. Minimum Shipping Margin
Standard Guarantee: We will not ship any products with fewer than 30 days of use remaining (days before expiration), unless previously coordinated and agreed upon with the customer.

No Automatic Guarantees: Outside of this 30-day minimum margin, Aircraft Shop Supply does not make any automatic guarantee as to the specific length of time remaining on any shelf-life item for standard orders.

4. Special Customer Requirements
We understand that certain projects, maintenance schedules, or regulatory standards require strict specifications. If your order has specific shelf-life requirements, please proceed as follows:

How to Request: If you require a specific Date of Manufacture (DOM), Date of Expiration (DOE), or a specific minimum shelf-life percentage (%), you must clearly state this requirement:

In the Comments/Notes section when placing an online order.

Explicitly written on your Purchase Order (PO) or quote request email for offline orders.

Validation Process: Once your requirement is received:

We will ship your order if the available stock matches your specifications.

If we do not have the exact batch, we will contact you prior to shipping with the shelf-life percentage (%) or dates we have available for your acceptance.

5. Limitation of Liability and Validity of Information
To ensure transparency and manage expectations, the following terms and conditions apply:

Time-Limited Validity: Any information provided by our team regarding the remaining shelf-life percentage (%) is valid only at the exact time the inquiry is made. Due to high inventory turnover, availability is subject to change without prior notice.

Informational Purposes Only: Shelf-life data provided by Aircraft Shop Supply is strictly for informational purposes and reflects the availability at the moment of inquiry. It does not constitute a batch reservation or a product warranty.

Supply Chain Liability Exclusion: Aircraft Shop Supply is not responsible for the time elapsed or any product expiration that occurs after the order has been prepared and packed. This includes, but is not limited to: the time between order placement, carrier transit times, intermediary storage, customs delays, and final delivery to the end user. It is the customer's responsibility to account for these logistical lead times within their planning.