CAN I MIX TWO DIFFERENT SPEED HARDENERS TOGETHER IN THE SAME BATCH?
Pipe Core’s Easy Pur Winter Cure Hardener could be added to an Easy Pur Summer Cure hardener. It is not ideal, however, as the curing speeds are relatively unknown. If it had to be done, in a desperate situation, we would advise installing the liner using a winter cure timeframe (very quickly) and left to cure using a summer cure timeframe (left for a longer period than normal). This is NOT possible with our Epoxy hardeners.
WHY IS SILICATE NOT RECOMMENDED WITH FELT LINER?
Silicate was developed for use with glass fibre matting, making it a very strong product for relining pipes. It also has a very quick cure time. It has since been used with felt due to the ease of installing longer patch liners around difficult access. However, silicate relies on the fibreglass for structural support and felt doesn’t provide the same support. It will likely shrink anywhere from 1-3% over time. Also, if the liner was to be installed inverted with silicate the liner can be prone to bubbling the coating.
Silicate with fibreglass matt: approx. 8000 e-modules (no shrinkage)
Epoxy with felt liner: approx. 4000 e modules (no skrinkage)
Silicate with felt liner: approx. 2000 e-modules (skrinkage)
MY EPOXY HARDENER 1504 IS A DIFFERENT COLOUR, WHY IS THAT?
One of the chemicals located in the 1504 epoxy hardener can react and change colour when it comes into contact with certain types of tins. It could be clear, or with a slight red or brown tinge to it. This change does not affect the cure properties of the liner in anyway.
WHAT IS POT LIFE WHEN REFERRING TO EPOXY RESINS AND HOW WILL THIS AFFECT MY WORK OR CURE TIMES?
Pot life refers to how long a mixture of resin will take to gel when it is in a 300gram quantity at 20 degrees. The curing of epoxy is an exothermic reaction and, as such, is greatly affected by temperature and mass. Therefore pot life is the best indication we have of work time.
If the resin mixture can be mixed and wet out into a liner quickly (where it is thinner than 300grams) then the work time with the liner will increase. If the temperature is cooler than 20 degrees then the work time will also increase.
THE BUCKET OF LEFTOVER RESIN IS SMOKING / STILL STICKY… HAVE I DONE SOMETHING WRONG?
Don’t panic! The answer is most likely, no. The bucket mixture is never a good representation of how the liner is curing in the ground. Smoking in the bucket its likely due to the mass left over. If still sticky, it maybe just very thin in the bucket or extremely cold.
I’VE PULLED OUT THE BLADDER OR CALIBRATION HOSE AND THE LINER IS STILL SOFT?
There have been cases in Melbourne, during winter, where buckets of resin have been left in the van overnight and become extremely cold. The next morning the resin was mixed early into a liner and left to cure. Subsequently the liner has not set as expected. We recommend using an infrared thermometer to check temperatures before mixing, to work out your cure times. Similar to cooling summer resins to increase work time, in colder climates winter resins may have to be warmed up to get an accurate cure time.
WHICH TYPE OF LINER IS BEST FOR THE PROJECT AT HAND?
Pipe Core Proliner has a thicker wall and is suitable for diameters up to 100-300MM diameter. It is capable of 2x dimension changes and inverts at extremely low pressure. This is the most popular liner for its strength. It is prone to wrinkles when working with 90 degree bends in PVC pipe.
Pipe Core Superflex liner has a slightly thinner wall thickness and is more flexible than the Proliner. It is suitable for diameters 40-100mm diameter and will achieve a cured 3mm wall thickness. It inverts extremely easily and is ideal when 90 degree bends are present in 100mm diameter pipe.
Both liners have Australian Watermark approval for their respective diameters.
THE LINER WRINKLED UP IN THE INTERNAL BEND, WHY?
This can happen when using a pull-in-place bladder. It is caused by the rubber pinching the liner as it inflates, curing a fold in it. This can sometimes be avoided by allowing some slack inside the rubber bladder with the retention strap (say 20mm) and then pulling length when it is at low pressure to straight out the fold.