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Discussion Starter #1 (Edited)
I received my recent shipment of Mann Lake PF-120 frames yesterday and as I was removing them from the boxes and placing them in freshly assembled and painted medium supers, I came across an interesting transition.

Check out this picture: http://parkerfarms.biz/Images/mlpf120.jpg

What I appeared to catch was the transition from one plastic supply to another. I even have some which have streaks of the older plastic while being made mostly of the newer.

This has happened once before to my knowledge. The original PF-120 frames (of which Michael Bush has thousands and you can see all over his website) were white. I have 20 of those originals. The frames that I have been purchasing over the past couple years have been yellow, slightly translucent, in other words you can see light through them if you hold them up to the sun.

However, these new ones are completely opaque, you cannot see light through them if you hold them up to the sun. They are of a slightly darker yellow plastic.

I don't really see any other changes. They've obviously not changed the mold, that would cost thousands of dollars, but it seems they have changed the plastic.

Thoughts?
 

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Local feral survivors in eight frame medium boxes.
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They did change the mold between my frames and the more recent ones. Mine have a flat bottom in the cells and the new ones have the "Y" in the bottom. You might want to measure them as well...

Odds are you got it right and they just got a new batch of plastic in.
 

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The PF frames for Mann Lake are now produced by a company here in North Canton, Ohio. Same basic design, but a new plastics manufacturer. That might explain the change in color you are seeing.
 

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There was a mold change in the last couple years. About the time they switched to yellow.
Possibly a new manufacturer.
 

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The newer yellow frames I purchased still have a light coating of wax on them. Not too much different than the older ones. It's just enough so the bees take to them alright.
 

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We use the Mann Lake PF series frames right out of the box, no wax added.
I know a beekeeper who uses the plastic inserts & orders them with extra wax. They are larger cell.
 

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Discussion Starter #14
Clayton, same cell size, appears to be the same mold (new mold would require 50,000 unit production run to be economical).
 

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MB just went and checked my pf 100's I bought last year they all have the flat bottoms. I wonder if Solomon's have the Y's at the bottom of the cell I'm inclinded to think that they do not. At least what I can see from his pics.
 

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It's hard to tell from Solomon's picture. Off to the right of the rightmost frame and more toward the top it kind of looks like it has the rhombi in them. Someone sent me a recent picture they said was PF100s and they had the rhombi in the bottom of the cells. Maybe Solomon can clarify the issue.
 

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Discussion Starter #18
Mine do have the "Y" but it's so shallow I'd hardly count it as there. It's really very weak. You have to look really closely. It's nothing like wax foundation.
 

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>Mine do have the "Y" but it's so shallow I'd hardly count it as there. It's really very weak. You have to look really closely. It's nothing like wax foundation.

Mine are perfectly flat on the bottom. No "Y" whatsoever. So it is a different mold.
 

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The plastic pellets used in injection moulding are a commodity like most raw materials. The injection moulding company likely changed suppliers. Though they could have changed the formulation. It's unlikely that they modified the mould at the same time. I noticed a difference in colour with my last order as well.
 
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