Slow color change
Old color keeps bleeding, especially dark-to-light or natural, costing time and material
Authorized CSC Thailand distributor
Injection molding purging compound
No.1 in Japan
ASACLEAN™ Thoroughly cleans screws, barrels, nozzles, check rings and Hot Runners. Match the grade to the job to cut downtime and scrap and hit accumulated black residue at its source — without overdosing
AI grade analysis
Distributor in Thailand
Chemical Specialties Corporation Ltd.
ASACLEAN from Asahi Kasei, Japan
CLEANING IN ACTION
Mechanical cleaning power
Cuts black residue and downtime
The degradation equation · The Catalyst
Time and the barrel environment inside the injection barrel
meansthe acceleratorturning resin degraded intoBlack specks
Leftover resin alone does not make specks — but combined with heat, oxygen and time it turns plastic into carbon
Old resin residue
Stagnant resin
+
heat
+
oxygen
=
Carbon
Black Specks
As the carbon layer thickens or pressure shifts, hardened stuck residue cracks and flakes into the fresh plastic stream —
the true cause of specks (Black Specks) riding along with scrap
SEARCH INTENT: problems factories need fixed
When purging with production resin alone is not enough
Injection machines harbor resin in nozzles, check rings, valve gates and manifolds — so match the purge method to the cause instead of just adding more resin
Hard material change
Old and new resins differ in viscosity and temperature range, so replacement never completes
Black Specks
Held degraded resin turns to carbon that later contaminates parts
Hot Runner color hang
Complex paths and small gates need a compatible, prohibition-free formula
Hot Runner purging guide
GRADE SCREENING
Shortlist grades from 4 data points before trials
This table is a preliminary screen — never a substitute for the product manual or machine-specific confirmation
- Old resin and next resin
- Actual processing temperature
- Hot Runner, gate or filter present
- Goals: color change, black specks, sealing or low residue
GL3GENERAL
General color and material changes
The value pick for core production changeovers
newEXPOWER
Stubborn residue and carbon
High cleaning power for hard-to-clean contamination with glass fiber
RUBALANCED
Balanced cleaning power and residue
All-round formula for many goals including manufacturer-term sealing
RE / SLLOW RESIDUE
Transparent jobs needing low residue
For rinse steps or changeovers needing easy system displacement
PF / PX2HIGH TEMP
PPS, PEEK, LCP and high-temp resins
Both grades cover 280–420°C, but PF is glass-fiber-free and Hot Runner compatible per maker terms, while PX2 contains glass fiber and is barred from Hot Runner
Grade names and properties reference the Asahi Kasei product list — always verify each grade latest data and your equipment before real use
CONTROLLED TRIAL
Run measurable trials — not pour and eyeball
Set the baseline and the end point before starting, so total cost compares fairly
Record machine data
Shot size, barrel capacity, screw diameter, Hot Runner, resin and temperature
Record the baseline
Purge time, resin used, scrap, and shots before parts pass spec
Follow the procedure
Set temperature, amount and purge/rinse rhythm per the confirmed grade
Compare total cost
Total compound, discarded resin, labor, downtime and scrap together, never price per kilo alone
Example — Black ABS → White HIPS
Asahi Kasei published an injection material-change evaluation comparing HIPS-only purging against ASACLEAN U grade
3.8 kgPurging with HIPS alone
0.8 kgWith ASACLEAN in the evaluation
These figures are the maker evaluation under specific terms — not guaranteed results for every machine
See the original sourceEach factory injection machines need their own recipe
The maker notes injection machines change color and material often, with many holdup points — hence grades from general use, stubborn residue, low residue, up to high-temp resins
So the most accurate data is never just which resin you run — it includes the next resin, actual temperatures, flow-path geometry and part acceptance criteria
Injection moulding by Asahi Kasei
RECOMMENDED AMOUNT
Baseline ASACLEAN dosage
Reference table for first estimating ASACLEAN by machine size and injection temperature — adjust to actual site residue
Machine Capacity
By clamp force
Test terms: purging temperature 240°C, purged resin ABS
| Clamp force (tons) | ASACLEAN amount GL2(U) (kg) |
|---|---|
| 80 | 0.4 |
| 125 | 0.6 |
| 550 | 2.5 |
| 800 | 5.0 |
| 1,250 | 7.0 |
| 3,000 | 16.0 |
Operating Temperature
By injection temperature
Test terms: 125-ton machine
| Injection temperature (°C) | ASACLEAN amount GL2(U) (kg) | Example resins |
|---|---|---|
| 180-230 | 0.4 | PS, PP, PMMA, POM and others |
| 230-250 | 0.6 | ABS, AS (SAN) and others |
| 250-310 | 0.8 | PA, PPE, PC, PBT and others |
Note: These figures are starting references from the sample document test terms — not constants for every machine, grade or problem. Sites with heavy black residue, Hot Runner, dead spots, dark-to-light changes, or other grades such as RU / RE should have the CSC team assess shot size, barrel capacity, actual temperatures and part criteria before trialing
FAQ
Questions before choosing an injection purging compound
How is purging compound different from using general plastic resin?
Purging compound is engineered to pull color, degraded resin and contaminants off screw surfaces, barrels and holdup points — cutting purge time and resin in many cases. But grade and procedure must match the job
Can machines with Hot Runner use ASACLEAN?
Only with maker-supported grades and terms. Verify glass-fiber-free formulation, temperature range, gate fineness and system limits. Never run glass-fiber grades through Hot Runner without confirmation
Which grade for black residue?
First separate hanging color, degraded resin, and baked-on carbon — and check for Hot Runner. NewEX suits stubborn residue but contains glass fiber, so it is not the answer for every system. Some cases need non-GF grades or multi-stage purge/rinse steps
How much per use?
See the table Baseline ASACLEAN dosage as a starting point, then adjust from shot size or barrel capacity, dirt level and flow-path sections. Over-procedure dosing is not always cleaner or more economical — record actual usage in the trial report
How to assess value?
Total machine stoppage time, labor, discarded resin, rejects, screw-pull count and compound cost — compared per changeover or monthly. Start estimating with ROI calculator for a first estimate
TECHNICAL SCREENING
Send machine data first
Send machine data first
get grade advice
Complete data cuts wrong-grade trials and lets procedure and success criteria hit the problem
Machine brand/size and shot size
Old → new resin and temperature
Hot Runner / valve gate / nozzle
Purge-cake or reject photos, if any
For PP injection jobs
If the purged job is PP, check PP type, color and changeover goal first atthe PP purging selection guide then return to this page injection procedure matched to TDS terms
