Scott Bader has recently added two new grades to its Crestomer range of structural adhesives.

Crestomer Advantage 10 is available in 380 ml cartridges, with a 50% shorter fixture time of 70 minutes compared with Advantage 30, while Crestomer 1150PA, available in 25 kg kegs (pails) and 200 kg drums for use with dispensing equipment, also has  a 50% shorter fixture time offive hours compared with Crestomer 1152PA.

Both new grades are primarily aimed at structurally bonding smaller sized FRP components and improving productivity, the company says.

Crestomer Advantage 10 has an opaque white colour and can be used for structural bonding and gap filling up to 15mm. Crestomer Advantage 10 is supplied pre-accelerated in a 380ml co-axial cartridge which fits most standard manual or pneumatic hand guns. The coaxial cartridge contains the 10:1 ratio Advantage catalyst, and is used with a replaceable static mixing nozzle to help ensure that a fully mixed adhesive is dispensed straight from the cartridge at the point of use.

According to Scott Bader technical data for Crestomer Advantage 10, the typical maximum tensile strength achieved is 20 MPa with a tensile modulus of 920 MPa and elongation of > 85% using the BS EN ISO 527-2 test method.

Damaged areas

Crestomer 1150PA is purple/ brown coloured thixotropic gel which can be supplied pre-accelerated as a two part adhesive system which uses a 50:1 mix ratio by volume and weight (v/w). The recommended hardener is Butanox M50 or equivalent MEKP catalyst, added at 2% v/w.  It has a working time (at 25 oC) of only 50 minutes and a fixture time of five hours. The 1150PA data sheet giving typical values of 23-26 MPa for maximum tensile strength, 1000 MPa tensile modulus and 100% elongation at break (according to BS EN ISO 572-2).  

Crestomer 1150PA can be applied by hand with a spatula or from a bulk dispensing unit with a gun, and is used for bonding and gap filling applications up to 15mm thick. The 1150PA grade is suitable for bonding green FRP laminates, balsa and foam core materials, wood, and some metals. It can also be used for bonding composite diesel tanks, contour joints, and to build up damaged areas in sections of an FRP component.

This story is reprinted from material from Scott Bader, with editorial changes made by Materials Today. The views expressed in this article do not necessarily represent those of Elsevier.