Transparent PU Potting Compound For Automotive PCB IP68 Waterproof 708

Flexible Low-Stress Transparent PU Potting Compound for Automotive Electronics

BZ-708-5-2 is a transparent, flexible, high-adhesion two-component polyurethane encapsulant engineered for automotive applications. It offers excellent processability and fast curing, making it well-suited for waterproofing tire pressure monitoring modules, sensors, and LED assemblies in vehicle environments.

1. Two-component polyurethane system with user-friendly handling and moderate flow characteristics.

2. Complies with ROHS environmental standards.

3. Outstanding flexibility and superior vibration dampening provide effective protection for sensitive electronic components.

4. Maintains reliable adhesion to both common plastics and metal substrates.

Parameters		Hardener BZ-708-5-2 A	Resin BZ-708-5-2 B
Before curing	Appearance	Clear liquid	Clear liquid
	Viscosity(mPa·s.25℃)	1200±450	1000±350
	Initial mixed viscosity(mPa·s.25℃)	1050±250
	Density(g/cm³.25℃)	1.04±0.05	1.12±0.05
Mixing&Curing	Mix ratio(by weight)	A:B=1:1
	Pot life 130±30g(min.25℃)	16±6
	Curing condition	Room temperature curing
	Surface drying time 30g(H.25℃)	5±1
	Curing time 30g(H.25℃)	7±1
	Curing time 30g(Heated)	60℃ heated 1±0.5H
After curing	Hardness (Shore A)	50±10
	Temperature resistance(℃)	-40~85℃
	Flame retardant UL94 (Vertical burning)	HB-V2
	Water absorption(24H)	≤1.0%
	Surface resistivity (Ω/sq)	≥1.0×1011
	Volume resistivity (Ω.cm)	≥1.0×1011
	Tensile strength(MPa)	≤6
	Elongation at break(%)	≥500%
	Dielectric constant(at 50Hz)	≤10
	Breakdown voltage(kV/mm)	≥16

Product Applications

1. Tire Pressure Monitor:High adhesion, flexibility, and excellent vibration resistance
2. Sensor: Transparency, flexible, resistant to high and low temperature shocks, suitable for various application scenarios.
3. LED modules:Tolerant to high and low temperature changes, good flexibility, low stress

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.

1. Hardener: Typically 5KG/ 10KG / 20KG/ 200KG metal or plastic drums.
2. Resin: Typically 5KG/ 10KG / 20KG / 200KG metal or plastic drums.
3. Store and transport as a general chemical product.
4. Store sealed, protected from light at room temperature. Shelf life varies from 6 to 12 months depending on packaging; please refer to the expiry date on the shipping package.
5. When temperature drops to 15°C or lower, the hardener or resin should be stored in a warm place or heated before use for potting. Specific heating recommendations depend on the temperature drop; please communicate and consult with us.