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CONSTRUCTION FIXINGS
which is wasteful of space. There have been soft skin cartridges that contains nine different resin systems. They even have fi ve different
incorporate a plastic end piece but now there are cartridges which injection guns. And it’s not just confusing for the specifi er, the
are all foil and so use very little material in their manufacture and distributor and the user. One manufacturer makes anchor rods for
occupy very little space in landfi ll, especially when compared with capsules with two different head styles - one with a cone shaped
the hard plastic types. driving mechanism and one with a hexagon - and just to illustrate
how confusing that is they show the hexagon anchor rod on their
website where they should be showing the cone type!
So how can the distributor and user avoid mistakes with so
many different systems to choose from? There are two approaches I
would recommend. One is to use the manufacturer’s
Technical Department whenever advice
regarding an appropriate
Foil cartridges. Alone they system is required. Before
won’t save the planet but every approaching them have
little helps. ready all the application
details, from base material
They are available with a range of different resin types including type and strength, to applied
polyester, polyester styrene free and vinylester so can cater for the loads and fi xture thickness,
majority of standard applications into concrete, brickwork, blockwork etc. Once they have made a
and stone. Admittedly, this product still uses a nozzle similar to recommendation make sure they
that of conventional cartridge systems so that does consume some take you through the specifi cation of not
resources but the saving from thousands of cartridges themselves only the resin and the rod but also the drill
will still be signifi cant. Of course the system that uses no resources diameter and depth and any setting tools, including the correct brush
in terms of cartridge or nozzle and involves no waste going to to use! It’s useful to get to know the characteristics, including the
landfi ll is the capsule system but for many applications it is either pros and cons, of the main systems you sell, then stick to them as
uneconomic or just unsuitable. far as you can. The other approach I would adopt as far as possible is
One question which may have occurred to you while reading this not to try to change an existing specifi cation unless it is unavoidable.
is, “Why do injection systems cure more slowly than capsule systems You take on a huge responsibility if you do. I will discuss the process
of the same resin type?” This is simply a matter of “heat is work of changing specifi cations and how it should, in my humble opinion,
and work is heat” as they teach you on engineering courses. Most be done in a later article if Mr Editor will let me to help you protect
resin systems depend on the temperature to cure, the hotter the your good name and your liability.
faster. When an anchor rod is
spun into a capsule the friction
generated by the grinding
together of all the components
within the capsule (the glass,
the resin, the catalyst and
those bits of quartz sand
aggregate which look like
coffee granules) generates
enough heat to kick-start the
curing reaction, so speeding up
the process. With the injection
system no such heat input
occurs so the reaction is just
slower to get going.
So, we have new systems
with faster curing, special
anchor rods for use in cracked
concrete, and cartridges to
save the planet. It’s all just
adding to the confusion
that already surrounds resin
systems.
The natty diagram (right)
shows various characteristics
of different resin types.
Confused? Me too! One major
manufacturer’s catalogue
Characteristics of different resins for different factors.
So confusing we won’t bore you with the legend.
Fastener + Fixing Magazine • Issue 61 January 2010
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