PERMABOND 738

Harmonization Code : 3506.10.00.00 | Prepared glues and other prepared adhesives, not elsewhere specified or included; products suitable for use as glues or adhesives, put up for retail sale as glues or adhesives, not exceeding a net weight of 1 kg

PERMABOND 738

Main features

  • Toughened cyanoacrylate formulation
  • Approximately 5,000 mPa·s viscosity
  • Suited to dark assemblies

Product Description

PERMABOND® 738 Toughened Cyanoacrylate Adhesive is a black, high-viscosity, single-component cyanoacrylate adhesive formulated to provide improved impact and peel performance compared with conventional cyanoacrylates. Its approximately 5,000 mPa·s viscosity supports controlled dispensing and gap filling up to 0.51 mm, while the black formulation is suited to dark-colored assemblies where adhesive appearance is important. PERMABOND® 738 adheres to substrates including steel, aluminum, galvanized steel, selected plastics, and elastomers. The TDS identifies speaker assembly, bonding to black substrates, and black PVC wire bonding as typical applications.

Key features

  • Toughened performance: Formulated for improved impact and peel strength compared with conventional cyanoacrylate adhesives.
  • High-viscosity gap filling: Approximately 5,000 mPa·s viscosity supports controlled application and gaps up to 0.51 mm.
  • Black formulation: Designed to visually match dark substrates in applications such as speaker assemblies and black PVC wire bonding.

Applications / Suitable for

  • Speaker assembly
  • Bonding to black or dark-colored substrates
  • Black PVC wire bonding
  • Steel, aluminum, and galvanized-steel bonding
  • Selected plastic and elastomer bonding
  • Assemblies requiring improved impact or peel performance
Product Family

PERMABOND 738

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TDS, SDS & Technical Documents

Technical Specifications

General Properties
Appearance
Appearance at room temperature.
Liquid
Color
The color
Black
Specific Gravity
Specific gravity (SG) is the ratio of the density of a substance to the density of a reference substance; equivalently, it is the ratio of the mass of a substance to the mass of a reference substance for the same given volume. For liquids, the reference substance is almost always water (1), while for gases, it is air (1.18) at room temperature. Specific gravity is unitless.
1.1
Physical Properties
Viscosity
Viscosity is a measurement of a fluid’s resistance to flow. Viscosity is commonly measured in centiPoise (cP). One cP is defined as the viscosity of water and all other viscosities are derived from this base. MPa is another common unit with a 1:1 conversion to cP. A product like honey would have a much higher viscosity -around 10,000 cPs- compared to water. As a result, honey would flow much slower out of a tipped glass than water would. The viscosity of a material can be decreased with an increase in temperature in order to better suit an application
5000 mPa.s
Curing Conditions
Fixture Time
25-30 seconds
Mechanical Properties
Impact Strength
16.8 kJ/m² mm
Electrical Properties
Dielectric Strength
Dielectric strength is measured in kV per mm and is calculated by the Breakdown voltage divided by the thickness of the tested material. Those two properties go hand in hand and while Breakdown voltage is always thickness dependent, dielectric strength is a general material property. As an example, the dielectric strength of Polyimide is 236 kV/mm. If we place 1mm of Polyimide between two electrodes, it will act as an insulator until the voltage between the electrodes reaches 236 kV. At this point it will start acting as a good conductor, causing sparks, potential punctures and current flow.
10 kV/mm
Maximum gap fill
0.51 mm

Additional Information

Technical properties

As-supplied / before-processing properties

Typical uncured and curing properties reported in the supplied technical datasheet. Values are representative and should not be treated as product specifications.

Property Value Unit Method / condition
Appearance Black liquid — As supplied
Solids content 100 % TDS typical value
Viscosity 5,000 mPa·s At 25 °C; source value 5,000 cP
Specific gravity 1.1 — Typical uncured value
Flash point 83 °C Equivalent source value 181 °F
Maximum gap fill 0.51 mm Equivalent source value 0.020 in
Set time — steel 25–30 s 25 °C; substrate-dependent cure-rate table
Set time — aluminum 30–35 s 25 °C; substrate-dependent cure-rate table
Set time — phenolic 5–10 s 25 °C; substrate-dependent cure-rate table
Set time — Buna rubber 10–15 s 25 °C; substrate-dependent cure-rate table
Full cure 24 h Typical full-cure time
Shelf life 6 months Stored at 2–7 °C
Technical properties

After-processing / final-state properties

Typical cured and bonded performance values from the supplied TDS. Bond strength varies with substrate, surface preparation, bond gap, humidity, and cure conditions.

Property Value Unit Method / condition
Lap shear strength — grit-blasted steel 21.4 MPa 24 h at room temperature; equivalent source value 3,100 psi
Lap shear — rigid PVC/PVC Substrate failure — 24 h at room temperature
Lap shear — acrylic/acrylic Substrate failure — 24 h at room temperature
Lap shear — polycarbonate/polycarbonate Substrate failure — 24 h at room temperature
180° peel strength — steel 13.0 pli ASTM D903; sandblasted steel
Impact resistance — steel/steel 8.0 ft·lb/in² ASTM D950
PVC plasticizer resistance — flexible PVC/steel Substrate failure — ASTM D903; 1 week at 70 °C
PVC plasticizer resistance — flexible PVC/PVC Substrate failure — ASTM D1876 T-peel; 1 week at 70 °C
Hardness 85 Shore A As reported in supplied TDS
Dielectric strength 250 V/mil Approximate cured value
Operating temperature -60 to 82 °C Performance/physical-property tables; see review flag regarding conflicting thermal statement

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