BASF Test Brick – Old Logo, Mold Pip Stud, With Roman Numerals (VII)

Many of the bricks from this mold show black marks like those shown in this photo.


Moulding defects:
Burn marks

Alternative name:
Air burn/gas burn/dieseling

Black or brown burnt areas on the part located at furthest points from gate or where air is trapped

Tool lacks venting, injection speed is too high

[Original post and comments on Flickr.]

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