Polyethylene Coating, EJ-EN8

EJ-EN8 is a polyethylene topcoat for the three-layer coating systems, in granule form. The product is also available in powder form. The product is suitable to operate in the temperatures from -45 C up to + 89 C.

EJ-EN8 complies with international standards, such as ISO and CSA, when appropriate industrial manufacturing standard procedures are implemented, and a continuous quality system is present. EJ-EN8 is best used in combination with L-5REN2 adhesive and a compatible FBE, such as EN 301A.

Characteristic	Testing	Requirement	Typical value of EJ-EN8
Density of the base resin, g/cm³	ISO 1183	≥0.930	0.947
Melt Flow Rate (190℃, 2.16Kg), g/10min	ISO 1133	≥0.17	0.45
Elongation at Break, %	ISO 527	≥600	858
Tensile Strength at Yield, Mpa	ISO 527	≥15	16.9
Melting temperature (DSC), ℃	ISO 11357	≥125	129.5
Vicat Softening temperature A50, (9.8N), ℃	ISO 306	≥110	116
Water content, %	ISO 15512	≤0.05	0.0028
Hardness, Shore D	ISO 868	≥55	58.5
Oxidation induction time, min	ISO 11357	≥10	15
Environmental Stress Crack Resistance (F50, Condition A), H	ASTM D1693	≥1000	1100
UV Resistance and thermal aging, %	ISO 21809-1	ΔMFR≤35	20
Carbon Black Content, %	ASTM D1603	≥2.0	2.2

Extrusion

EJ -EN8 can be applied by flat die or crosshead extrusion. The actual extrusion conditions will depend on the type of equipment used and the size of the pipe. The following conditions may be used as a guideline when starting up the extruder:

Item	Feeding Zone	Middle Zone	Transition Zone	Mould Head	Melt Temperature
Processing Temperature℃	130～180	220～240	220～240	220～240	200～240