PEXIDAN® X/T-UV

SACO AEI strongly suggests that the pre-grafted base PEXIDAN® A-3001 and CAT-005FR-UV1 flame retardant catalyst masterbatch be dosed directly in the throat of the extruder using a gravimetric or loss-in-weight feeder. In order to prevent scorching the grafted compound and the catalyst masterbatch must be stored separately and mixed just prior to consumption.
For UL44 type cables requiring FT2 performance, a ratio of 80:20 should be used. For UL4703 type cables requiring FV1 performance, levels of CAT-005FR-UV1 up to 35% may be required depending upon wire size. Consult SACO for catalyst loading for UL4703 PV wire applications.
PEXIDAN® X/T-UV can be processed with PE single screw extruders having proper temperature control and a good mixing screw (2.5:1 ratio at least).

The following temperature profile is suggested:

These conditions may depend on the equipment being used. It is recommended using conveyors and tools shaped in order to prevent stagnation in the head. In case of prolonged shutdown, purge the extruder with LDPE.

Curing - Curing can be done by immersion in hot water at 70°-95°C, by exposure to low pressure steam, or ambient atmospheric moisture. In all cases curing time depends on wall thickness, temperature, relative humidity and quantity of wire on the reel.

Color Masterbatch - A wide range of commonly used color masterbatches based on LDPE are available. A use level of 1.5% by weight should give an acceptable color but this will be dependent upon the concentrate itself. Levels of concentrates should be kept to a minimum because they can detract from performance. It is recommended that the catalyst and color masterbatches be dried prior to usage 4-6 hours at 60°C (150°F) using a desiccant dryer.

When using color masterbatch in an outdoor (SUNRES) application, it is important to select a masterbatch that will remain color-fast and not fade when outdoor weathered, that is a masterbatch in which the pigment is UV stable. SACO recommends consulting your color masterbatch supplier for guidance. 

The physical form of both PEXIDAN® A-3001 and CAT-005FRUV1 is free flowing pellets, available in 1500 lb (680 kg) and 2000 lb (907 kg) gaylords respectively, or in 300 lb (136 kg) fiber drums.

Due to the moisture sensitivity of PEXIDAN®, SACO AEI Polymers suggests that the following points should be considered when storing the materials: 

• Packaging should remain sealed
• Avoid temperature above 30ºC
• Avoid storage outside and in direct sunlight
• Use within 8 hours of opening packaging