(Structural adhesives for honeycomb sandwich fabrication)

Vikram Sarabhai Space Centre of Indian Space Research Organization has developed an epoxy film adhesive; EFA-1753 (300 GSM) and EFA-1752 (200 GSM) (in the form of continuous film) that cures at elevated temperature 175 °C for 1 h and they possess good adhesive strength and filleting properties. Light-weight honeycomb sandwich structures are extensively made using epoxy film adhesives with precisely controlled glue line thickness. Film adhesive can also be used by shipping and boat manufacturing industries also, for fabrication of sandwich structures and other composite assemblies.

Salient Features

vOne-component, heat curable, toughened, high strength polymeric film adhesive.

vHeat curable (175°C for 1 h).

vEnsures filleting during curing, leading to very high bond strength in honeycomb sandwich.

vSpace qualified.



Areal density, GSM [Two types]

300±20 (EFA 1753) and 200±20 (EFA 1752)

Lap shear strength at 25°C (Al/Al), MPa

≥ 25

LSS at 130°C (Al/Al), MPa

≥ 12

LSS at -196°C(Al/Al), MPa

≥ 25

Honeycomb Flat wise tensile strength at 25°C , MPa

≥ 4

TML, %

≤ 1.0


≤ 0.1

Technology transfer from ISRO

  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.

For further details, please contact: 


Technology Transfer & Industrial Coordination Division (TT&IC)

Vikram Sarabhai Space Centre,

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