H.B. Fuller 1521

Identification & Functionality

Chemical Family

Silicones

Product Type

2K (2 component) Adhesive,

Encapsulant,

Potting Compound,

Reactive Adhesive

Technologies

Adhesives & Sealants

Product Families

Adhesives & Sealants — Bonding Technology

2K Liquid Reactive Adhesives

Adhesives & Sealants — Functional Adhesives

Encapsulants

Features & Benefits

Ready-to-Use Product Features

Enhanced Damp Proofing,

Excellent Sealing Capability,

Fast Cure,

Good Adhesion,

Good Electrical Properties,

Good Thick Section Cure,

Rapid Cure Response,

Room Temperature Curing

Applications & Uses

Markets

Industrial

Applications

Industrial — Chemical & Industrial Manufacturing

Equipment & Parts

Industrial — Renewable Energy

Energy Storage Systems,

Solar Energy,

Wind Energy

Application Area

Batteries,

Blades,

Edge Gluing,

Electronic Components,

Energy Storage,

Frame Sealing,

HVAC Applications,

Ingot Bonding,

Junction Boxes,

Lithium-Ion Battery,

Module Installation,

PV Modules,

Rail Bonding,

Solar Panel,

Turbines

Compatible Substrates & Surfaces

Glass

Curing Conditions

Cure speed will vary with temperature, relative humidity, depth of material and presence of moisture. Some applications may require special surface preparation.

General Instructions

• For best performance bond surfaces should be clean, dry and free of any contaminants and oils.
• Part A should be blended thoroughly before mixing with Part B in order disperse filler material evenly.
• Mix Parts A and B evenly according to the applicable mix ratio.
• Apply the mixture to the sealing or potting application. Automated dispensing equipment is recommended for electronics sealing and potting applications.

Properties

Color

Black

Physical Form

Liquid

Appearance

White

Component A

	Value	Units	Test Method / Conditions
Viscosity	7000.0	cP	—

Component B

	Value	Units	Test Method / Conditions
Viscosity	25.0	cP	—

Electrical Properties

	Value	Units	Test Method / Conditions
Volume Resistivity	1.0 x 10¹⁵	Ω.cm	IEC60093, GB/T1692
Breakdown Voltage	23.0	kV/mm	IEC 60243-1, GB/T1695

Cured Properties

	Value	Units	Test Method / Conditions
Elongation at Break (50% RH)	110.0	%	ISO37, GB/528
Hardness	40.0	—	ISO7619, GB/T531, Shore A
Tensile Strength (50% RH)	1.2	MPa	ISO37, GB/528
Thermal Service Range	- 50 - 150	°C	—

Uncured Properties

	Value	Units	Test Method / Conditions
Fixture Time	45.0	min	—
Cure Schedule (50% RH)	7.0	days	—
Weight Mix Ratio	6:1	—	—
Working Time	8.0	min	—
Specific Gravity	1.4	—	—
Volume Mix Ratio	4:1	—	—

Packaging & Availability

Regional Availability

• Africa
• Asia Pacific (Excluding Russia)
• Europe (Excluding Russia)
• India
• Latin America
• Middle East
• North America

Packaging Information

14kg

Storage & Handling

Shelf Life

6 Months

Storage Condition

Product shall be ideally store in a cool, dry area in unopened containers. Material should be stored at a temperature of 8 - 25ºC for a maximum. In the original unopened container. Do not return unused material back into the container.