Phosphorescent Injection Molding Recommendations

Avoid exposing product to strong acids and or heavy metal compounds as they will react with the glow component and destroy the phosphorescent effect.

Keep Moisture content of product to a minimum. Moisture content should be no
greater than 00.05 – 0.10%. Minimum Drying time should be 2- 4 hours at 180℉(Fahrenheit) in either a dehumidifier or hopper dryer. It is recommended that a dew point of -20℉(Fahrenheit)   be achieved for the inlet air Phosphorescent master batches or compound material containing luminescent pigment must be fully dried before using!

Use the smallest injection molding machine or barrel size in order to minimize residence time. A maximum 2.5:1 compression ratio screw is also recommended.

The use of a free-flow screw tip is highly recommended in order to minimize any shearing effects on the product which might degrade the phosphorescent effect.

The use of large-size nozzles and gates as well as full, round runners with no sharp turns are also recommended in order to minimize shearing.

For processing phosphorescent compounds, it is best to use machinery such as plunger-type injection molding machines or single-screw extenders, which ensure delicate handling of the phosphorescent material. Always consult extruding machine manufacturers’ specifications for processing temperatures and injection speed questions and or problems.

Utilize the least possible amount of back pressure in order to preserve the phosphorescent effect.

Mold surface and barrel temperatures should be set at the lower end of the optimal rang recommended for the base resin.

Be aware that the crystals that produce the phosphorescence in the product are highly abrasive and may scour the screw and or barrel. Prior to use thoroughly clean and purge the barrel always run virgin resin prior to running.

Note that this scouring action may in fact cause the crystals to become crushed resulting in a duller brownish green color. Only the adherence to recommended processing parameters and very thorough clean-out procedures will ensure that the resultant part color matches the original phosphorescent compound.