ADBOND EPP 3521 is a rubber based adhesive system developed for mounting various electronic systems to the structural elements. It is having very good thermal conductivity with good electrical insulation property and also possess very low out gassing characteristics.

 This is an elastomer modified epoxy system consisting of insulative oxide filler in high concentration with silane coupling agent to provide electrical insulation and thermal conductivity.

ADBOND EPP 3521 will find usage in electric/ electronic gadgets manufacturing areas where potting/ bonding with good thermal dissipation and electrical insulation are warranted.

Typical Properties / characteristics:




Color & consistency



Black & pasty


Viscosity of the resin (ps)


700 to 8000


Sp. Gravity


Hardness (Shore D)


Lap shear strength (ksc) on Alumina at RT


Thermal conductivity (cal/cm/C/s)

1.04* 10 –3

Volume Resistivity (ohm- cm)

1.5* 10 13

Out gassing

       - TML (%)

      - CVCM (%)


< 1




Pot Life (min.)


Service temperature

223 K to 338 K



ISRO is willing to offer the knowhow of this technology to suitable entrepreneurs / industries in India. Capable manufacturing industries interested in acquiring this knowhow may write with details of their present activities, requirements and plans for implementation, infrastructure and technical expertise available with them, their own market assessment, if any, and plans for diversification to the address given below:


Technology Transfer & Industrial Coordination Division (TT&IC)

Vikram Sarabhai Space Centre, ISRO PO

Thiruvananthapuram-695 022

E mail: This email address is being protected from spambots. You need JavaScript enabled to view it.

Ph: 0471-2564081

Fax: 0471-2564134