PU Potting Compound – Clear, Anti-Yellowing, UL94-V2 Encapsulant for LED

Product Description

BZ-211 is a flame-retardant, optically transparent two-component polyurethane system formulated for LED strips, linear luminaires, and sensor modules. It offers dependable fire protection and stable dimensional behavior over a wide temperature window, safeguarding sensitive electronics against moisture, dust, and thermal cycling while preserving long-term optical and mechanical performance.

Key Product Features

1. High-clarity, moderate-viscosity formulation: supports bubble-free encapsulation through manual or automated dispensing.
2. Globally compliant: RoHS and REACH ready for smooth cross-border trade.
3. Superior weatherability: resists aging and UV exposure, with minimal yellowing after 3–5 years of outdoor service.
4. UL94 V-2 rated (QMFZ2.E352175): delivers recognized flame-retardant reliability.
5. Excellent flexibility and flex endurance: withstands repeated bending without cracking.
6. Tailored for LED lighting: well-suited for strip encapsulation, linear fixture coating, and compact sensor potting.

Technical Parameters

Parameters		Hardener BZ-211A	Resin BZ-211B
Before curing	Appearance	Clear liquid	Clear liquid
	Viscosity(cps.25℃)	5000±1500	1600±400
	Initial mixed viscosity(cps.25℃)	2000±1000
	Density(g/cm³.25℃)	1.11±0.05	1.03±0.05
Mixing & Curing	Mix ratio(by weight)	A:B=1:1
	Pot life 130±30g(min.25℃)	25-40min
	Curing condition	Room temperature curing
	Surface drying time 30g(H.25℃)	6-10
	Curing time 30g(H.25℃)	12-16
	Curing time 30g(Heated)	Heated curing isn’t advised
After curing	Hardness (Shore A)	55±5
	Temperature resistance(℃)	-40~85℃
	Water absorption(24H)	≤1.0%
	Surface resistivity (Ω/sq)	≥1.0*1012
	Volume resistivity (Ω.cm)	≥1.0*1012
	Tensile strength(MPa)	≥3
	Elongation at break(%)	≥100%
	Dielectric constant(at 50Hz)	≥8
	Breakdown voltage(kV/mm)	≥14

Product Applications

1. LED Flexible Strip Light – Clear encapsulation with V2 flame retardance, flex-resistant with no adhesive delamination.
2. LED Outdoor Luminaire – V2-rated fire safety and anti-yellowing for 3+ years outdoors, plus robust waterproof sealing.
3. Sensor Module – Transparent, flexible potting that shrugs off thermal shock and humidity, performing stably across varied operating conditions.

Directions for Use

1. Pre-potting Preparation: Calibrate scales, prepare potting tools, cleaning tools, check machine settings, check vacuum pump force, etc.
2. Product Pre-treatment: Place product on a level surface or fixture. Remove dust, clean, degrease, and dry if necessary.
3. Accurate Proportioning: Manual operation requires precise mixing according to the specified ratio and recording. Machine potting requires calibrated ratios and first-article confirmation is recommended.
4. Mixing & Stirring: Manual operation requires thorough stirring or using electric stirrers to ensure homogeneous mixing. Machine potting requires sufficient stirring speed, adjust as needed.
5. Uniform Potting: Manual operation should be done in small, multiple batches to ensure uniformity. Machine potting should follow the programmed path for quantitative dispensing.
6. Inspection or Secondary Potting: After potting, visually inspect as needed. Perform touch-up, bubble removal, or secondary potting if required.
7. Curing: Allow the potted and inspected products to cure at room temperature or with heat assistance (recommended 60°C if needed), according to product and process requirements.
8. Final Product Confirmation: Perform visual inspection and performance testing as required by the customer.

Packing

1. Hardener: Typically 5KG/ 10KG / 20KG/ 200KG metal or plastic drums.
2. Resin: Typically 5KG/ 10KG / 20KG / 200KG metal or plastic drums.

FAQ

Q1: What are the main features of the Weather-Resistant Transparent Polyurethane Potting Compounds?

A1: This potting compound offers excellent weather resistance, high transparency, strong adhesion, and durability, making it ideal for protecting electronic components from moisture, dust, and environmental damage.

Q2: Can this potting compound be used for outdoor electronic applications?

A2: Yes, the weather-resistant properties of this transparent polyurethane potting compound make it suitable for outdoor use, providing protection against UV rays, rain, and temperature fluctuations.

Q3: Is the compound easy to apply and cure?

A3: Yes, the potting compound has good flow characteristics for easy application and typically cures at room temperature, forming a tough and flexible protective layer.

Q4: Does the transparent nature of the compound affect its protective qualities?

A4: No, the transparency of the polyurethane potting compound does not compromise its protective features; it still provides excellent insulation and environmental protection while allowing visual inspection of the encapsulated components.

Q5: What types of electronics are compatible with this potting compound?

A5: It is compatible with a wide range of electronic components, including circuit boards, sensors, connectors, and LED assemblies, especially those requiring clear encapsulation and protection from harsh environmental conditions.