U Grade Purging Compound
U Grade is a versatile, HIGH-PERFORMANCE purging compound especially suited for color and material changes for thermoplastic injection molding and extrusion machines. U Grade has a wide service temperature range encompassing most commodity, engineering, and super-engineering resins, making it unnecessary for multiple grades. U Grade is also recommended for hot runner cleaning as well as sealing and shutting down machines to prevent carbon on start-ups.
|High Performance General Purpose||Styrenic-Based|
|Resins Purged: Most commodity and engineering resins within the processing temperature range.|
|U Grade’s cleaning power approaches that of our strongest scrubber, EX Grade, but without the glass filler. It is ideal for applications that require higher detergency while maintaining lower residue.|
|U||See our other grades|
|Color Changes||EX, UP, E, SX, PX2|
|Material Changes||EX, UP, E, SX, PX2|
|Hot Runner Cleaning||UP, E|
|Clear/Low Residue Applications||E|
|High Temperature Resins||EX, SX, PX2|
|Low Temperature Resins||E|
Processing temperature: 350°F to 680°F (180°C to 360°C)
U Grade requires a 0.020″ (0.5 mm) clearance for hot runner gates and extrusion dies; 100 mesh is required for extrusion screen packs.
Tips when using ASACLEAN:
|ASACLEAN does not work by chemical reaction.|
|No soak time or hold-up time is required for an effective purge|
|For maximum performance, ASACLEAN should not be diluted with other materials.|
|ASACLEAN works best with maximum agitation. Use the maximum safe screw speed and for injection molding also use maximum safe back pressure with the screw in the most forward position.|
Usage Example: Nylon color change
The photo series below shows purge piles from black to natural Nylon color changes with and without the use of ASACLEAN U Grade.
[Machine: 200 ton injection molding machine at 530°F - Total Purge time 30 minutes]
(Purge piles shown are in 5-minute intervals)
[Machine: 200 ton injection molding machine at 530°F - Total purge time: 10 minutes]