Question
Is that true that you use less material with a chemical purging compound compared to a mechanical type purging compound?

Answer
That’s not exactly true. The amount of purging compound required to clean a machine is based not only on the machine (barrel) size but also on the degree of contamination within the barrel. The truth of the matter is that we are recommending 2-3 barrel capacities for mechanical, and 1-2 for chemical purges, plus flushing material. So, I would say there really isn’t a good rule of thumb stating that one requires more than the other.

Question
How much ASACLEAN do I need to purge out my previous resin?

Answer
Our rule of thumb: for screw and barrel cleaning, usually 1-3 barrel capacities do the trick. For very tough jobs, such as machines that haven’t been cleaned in a while, an additional 1-2 barrel capacities may be necessary.

Question
How much resin does it take to displace ASACLEAN?

Answer
Another rule of thumb is it takes the same amount of the next processing resin to displace as the amount of ASACLEAN used.

Question
How long does it take to purge with ASACLEAN?

Answer
Purge time is affected by several key factors such as machine size, condition of screw and barrel, resins being purged, etc. Therefore it’s difficult to predict how long a purging application could take. However, ASACLEAN consistently reduces the amount of purge time required in comparison to most other purging methods.

Question
Should ASACLEAN be left in the barrel to soak during purging?

Answer
There’s no need to let it sit in the barrel for an extended “soak period” for general purging for the mechanical purging grades of ASACLEAN. For the chemical purging grades, yes, some soaking time is required. Please follow each grade’s purging instructions or consult your ASACLEAN technical sales rep.

Question
Do I need to raise the machine temperatures when purging with ASACLEAN?

Answer
In most cases, no! Our general-purpose grades have a wide service temperature range 200-330°C (390-625°F)*If using material between 330-360°C (625-680 °F), local ventilation is required. ASACLEAN also offers specialty high-temperature and low-temperature grades for any applications above and below the temperature range of our general purpose grades.

Question
How much ASACLEAN is required to clean out hot runners?

Answer
While there is no exact answer for this, as every application is different, a loose rule of thumb is that an additional 1-3 barrel capacities of ASACLEAN is required to purge out hot runner tooling once the screw and barrel are cleaned.

Question
We use ASACLEAN only when we need to purge out tough resins such as PC or Ultem. For everything else, we just run regrind or virgin PP to purge because our company feels it’s cheaper than using a purging compound. On the floor though, we find that regrind or PP doesn’t always cut it. Any recommendations?

Answer
It is no surprise that the regrind or virgin PP resin are not sufficiently purging your machines. Materials such as these are not designed to purge and clean machines the way ASACLEAN is. When using regrind or virgin resins to purge, they simply layer over any resins, color deposits or carbonized material within the barrel. In time, these layers become additional sources of contamination, making purging even more difficult. ASACLEAN should be used to purge all resins, whether they are considered “simple” or “difficult” to purge, so that the machine is thoroughly cleaned and that any build-up of contamination is prevented

Question
Can I use a styrenic-based grade of ASACLEAN for purging out resins that are not styrenic? Similarly, can I use an olefinic grade of ASACLEAN for purging out resins that are not olefinic?

Answer
Generally, yes. Our styrenic grades are considered “General Purpose”, meaning they can purge out a variety of materials in a wide temperature range, including olefinic materials (PP, PE). And although our olefinic UP Grade is specially designed for purging out PP, it has proven quite effective for other materials such as Nylon and PVC.

Question
Can we mix ASACLEAN with our resin in order to cut purging cost?

Answer
ASACLEAN should NOT be diluted with resin as it only cuts cleaning performance. As a result, purging time increases and so does material use, ultimately lowering overall cost savings.

Question
We have black specks (carbon contamination) in our parts. What do you recommend for this?

Answer
EX Grade is our strongest ASACLEAN solution. It is a glass-filled version which offers superior scrubbing and cleaning. EX Grade is only recommended for screw and barrel cleaning. To prevent carbon build-up and to maintain a clean machine, we recommend using one of our general-purpose grades as part of a preventive-maintenance program.

Question
Can ASACLEAN be used for high temperature resins?

Answer
Our high-temperature SX Grade has a service temperature range of 300-370°C (570-700°F) , making it able to purge high-temperature resins that most other commercial purging compounds can’t. SX Grade works exceptionally well for resins such as PEEK and Ultem. We also have PX2 Grade Temperature goes up to 420°C(790°F) which is a glass-filled grade for high temperature resins that goes up to 788°F.

Question
Can ASACLEAN be used in conjunction with a machine’s auto purge cycle?

Answer
ASACLEAN certainly can be used with an injection molding machine’s auto purge setting. However, if the cycle is not programmed to incorporate high backpressure and high-screw speed while maintaining the screw completely forward, you will not receive the full purging benefits of ASACLEAN. Remember, ASACLEAN is a mechanical type purge so the afore-mentioned settings should be maximized.

Question
Do we really need to perform short, high-velocity injection shots each time we purge with ASACLEAN?

Answer
Yes, this part of the purging procedures should be standard each and every time you purge with ASACLEAN. This step ensures better cleaning of the nozzle area and check-ring, which are common areas for contamination hang-up.

Question
What can we do to lessen the potential of ASACLEAN residue?

Answer
When displacing ASACLEAN with the next processing resin, it’s crucial to maximize the backpressure and screw speed, which keeping the screw in the fully-forward position. This will ensure the quickest and most thorough displacement of ASACLEAN. If working with particularly residue-sensitive resins, it may be necessary to use our low-residue E Grade as a “chaser” after having used the cleaning grade. This two-grade combination provides maximum cleaning with minimum residue.

Question
Related to Sealing with ASACLEAN during machine shutdown, what is duration considered for “major downtime”? Hours, days, etc?

Answer
We consider major downtime to be anything that requires the screw to be stopped for an extended period such as PMs, off-shift or weekend shutdowns, sever quality problems where problem solving is required, etc… Basically, any time that the plastic is under heat for an extended period of time in the screw, barrel, head, accumulator, or die. These are the best times to seal with a purging compound.

Question
Which is the most recommendable purging compound to be used in an extrusion line of 1-liter HDPE bottles which runs from Monday to Friday and needs to start up each Monday? In that case no need of color change is needed.

Answer
We would recommend sealing your equipment during shutdown with a HDPE-based purging compound such as our UF-2 grade.

Question
The effect of sealing (that prevents degradation)in the screw that you showed for ABS can happened in a screw that only runs with virgin HDPE?

Answer
Yes, even HDPE will degrade over time. If you have ever seen plastic buildup around a die, you can see that it will burn over time. HDPE will certainly take longer than ABS to degrade, but it will happen.

Question
Are the purges from Asaclean recyclable?

Answer
We do not recommend grinding it up and reusing because the contamination that Asaclean pulls out of your machine would go right back into it.

Question
Do you have any high temp (700) purging compound?

Answer
Yes, we do. We have 3 high temp grades that go as high as 790F (420C).

Question
Purging Compounds can be regrind and used after one use?

Answer
We do not recommend this because the purge will be full of contamination. You would not want to add contaminated purge back into your process as it will only create more problems.

Question
Is ASACLEAN purge compound moisture sensitive?

Answer
Asaclean purging compounds do not need to be dried prior to use. Ambient moisture does not impact our ability to clean.

Question
Do you have a special purging compound to change production from polyethylene (low MFI) to biodegradable bottles (higher MFI that PE)?

Answer
We are not sure which biodegradable resins you are speaking of, but we believe they tend to run at lower temperatures. Our lowest temperature grade is E-grade. It has a recommended temperature range of 160-300°C (320-570°F)

Question
In the case of the standard HDPE extrusion; could you reuse a portion of the purge if properly ground?

Answer
We do not recommend this, as it is our expectation that the purge will pull out significant contamination when properly used. This would result in putting the contaminants right back into the barrel if you were to re-use it.