General Specifications about Solar Sealant & Adhesive

Here is a comprehensive specification sheet for Solar Sealants & Adhesives, which are used to bond and seal components in photovoltaic (PV) modules, such as the junction box, frame, backsheet, and glass, ensuring long-term durability and weather resistance.

Parameter

Specification

Type

Silicone, Polyurethane (PU), Modified Silicone (MS), or Butyl-based

Application Areas

Junction box bonding, Frame sealing, Glass bonding, Backsheet lamination

Color

Black / White / Transparent / Grey

Viscosity

30,000 – 300,000 cP (depending on type; paste-like consistency)

Curing Type

Moisture-curing (RTV), UV-curing, or two-component (dual-cure)

Skin-over Time

5 – 30 minutes (at 25°C, 50% RH)

Full Cure Time

24 – 72 hours (varies by formulation and thickness)

Shore A Hardness

25 – 60 (Flexible to semi-rigid)

Elongation at Break

≥ 200% – 500% (high flexibility)

Tensile Strength

1.5 – 3.5 MPa (typical)

Adhesion Strength

Excellent adhesion to glass, aluminum, PET, and TPT

Dielectric Strength

> 20 kV/mm (essential for electrical insulation)

Volume Resistivity

≥ 1 × 10¹⁴ Ω·cm

Thermal Conductivity

~0.2 W/m·K (standard) – higher for thermal adhesives

Temperature Resistance

-40°C to +150°C (some up to +200°C intermittent)

UV Resistance

Excellent (especially in silicones and MS polymers)

Water Resistance

Excellent (suitable for outdoor and marine use)

Shelf Life

6 – 12 months (unopened, cool dry storage)

Packaging

300 ml cartridges, 600 ml sausages, bulk pails, or drums

Compliance Standards

UL 94-V0, IEC 61215, RoHS, REACH

Silicone Sealant (MS1937)

This premium product is a high-quality, neutral, flexible, one-component MS polymer adhesive/sealant that hardens upon interaction with moisture to form a flexible material. The surface formation and curing time depend on humidity and temperature, and the curing time also depends on the joint depth. This time can be reduced by increasing temperature and humidity; low temperatures and humidity inhibit the process. It is odorless and free of solvents, isocyanates, silicones, and PVC. It has good adhesion without a primer to many surfaces and is compatible with appropriate paint systems. This adhesive/sealant also has good UV resistance, making it suitable for both interior and exterior applications.

Product Technical Specifications

Rheology

Value

Condition/Method

Sag resistance

No sagging

—-

Density

Specific Density

approx. 1.45

—-

Curing

Skin formation time (min)

5-20

(23±2) ℃, (50±5) % relative humidity

Cure rate (mm/24h

approx. 4

(23±2) ℃, (50±5) % relative humidity

Cured Mechanical Properties

Hardness (Shore A)

approx. 55

ISO7619, GB/T531

Tensile Strength (MPa)

approx. 3.0

ISO37, GB/T528

Elongation to Break (%)

approx. 200

ISO37, GB/T528

Thermal Indication

Application temperature

5℃ to 40℃

Operating temperature

-40℃ to 100℃

Short exposure

120℃

Technology

Base MS-polymer

Type of Product

Adhesive/Sealant

Components

One component

Curing

Humidity cure

Appearance / Color

White/Black/Gray

Consistency

Thixotropic paste

Features and Benefits

– < 1% VOC

– Non-corrosive

– Primerless adhesion on many substrates

– High performance mechanical properties

– Color stable and UV resistant

– Ecological advantages – free of isocyanates, solvents, halogens and acids

– Paintable