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Comments
I'd guess the more action they've seen they could become worn down and a little slack.
I've got a load of lego bricks from the 80's and a number of them are worn or loose through age and playwear.
Point 1. They may be made from 'older' plastic (pre-ABS)
Point 2. If the lego is well played with, they're more also likely to be loose.
ABS bricks lose their clutch power by being connected to other LEGO bricks. So if you leave your LEGO assembled for years, the clutch power will start to fade. Supposedly also the case with high levels of humidity, although I haven't really experienced that firsthand.
Effectively, when your LEGO is assembled, the reason it sticks together is that there's some stretching of the plastic going on which is creating the grip. Leaving it together gradually keeps stretching until eventually the plastic will conform itself to whatever it's attached to. That typically takes many years-- I noticed it VERY slightly after about 3 years, but that was only a reduction in clutch power, not a total loss.
DaveE
Curious. Did you buy some parts from a seller overseas in Hong Kong, or just someone here in the states? There's a Hong Kong guy selling Lego-ish parts for dirt cheap, but his feedback is questionable.
Also, check the side of the bricks, they may have hairline cracks that you cannot see when the brick is unessembled, but you will notice it when attached to an other brick. This will definitely make them looser.
In my case, I built a LEGO AT-AT, whose head was held on by studs facing forwards. I left it together for several years. Initially, the head held up pretty well. But progressively over the next few years, when I would try to stand it up, the neck would break apart, forcing me to rebuild it. After about 2-3 years, I could still get it to hold up, but it took careful rebuilding (and a lot of pressing the studs together really hard), and careful positioning. And after 3-4 years, no matter how much I rebuilt the neck, it wouldn't hold together.
However, with that said, I couldn't notice the loss in clutch power with my hands. There was no discernible difference in clutch between the bricks that were obviously slightly stretched and newer bricks that weren't used. But the model I built was JUST at the cusp of being within the bricks' initial clutch power, so a slight loss was sufficient to prevent the model from holding up (but not enough to be noticeable on human terms).
In other cases, I've taken apart pieces that have been together for roughly 15-20 years. They've lost enough clutch to be noticeable, but they still grip. Also, it's important to note that they clutch differently in different orientations. So if you rotate the brick by 90 degrees, it may suddenly hold very well, since only certain parts of the brick are warped.
So, I guess it's really up to you. Yes, ABS bricks will gradually lose their clutch power, but it will usually take a long time to be noticeable.
DaveE
Although Cellulose Acetate does have a tendency to warp... kept under ideal conditions, it may not warp... (humidity and temperature). TLG knew by 1959 that something was wrong with the plastic they were using... in the LEGO catalog of European countries starting that year, they mention not to store LEGO above a certain temperature.
Also, Cellulose Acetate has a tendency to not discolor as much as ABS does. Many white CA parts from the 1950s and 1960s are as pure white, as they day they were made... but when you do the "wobble test" (lay a 2x4 brick on a flat table surface and see if the bottm edges wobble at all)... that's when you know you have CA if the part wobbles back and forth.
As far as ABS plastic... I've had LEGO buildings made of ABS constructed for 30 years (but stored in a cool basement)... and the clutch power on the parts has not changed significantly (I compared it to the clutch power of new parts, and couldn't tell the difference). As with all LEGO... store them away from heat.
From 1970-74 TLG made those very nice looking granulated trees and bushes... but likely to their horror kids were chewing the green granules off the foliage, and that was a shortlived product. Too bad... they were much nicer that the conical (1974) and spherical (1978) trees that they replaced.
I also remember the earliest 1x1 round bricks without a tapered base. Even back when they were new (I have yet to find one that wasn't made of Cellulose Acetate) many of them didn't stick together very well.... some did... but not a lot of them. Then in 1966 TLG redesigned that piece (after they alreadys started with ABS plastic) as a solid stud tapered base 1x1 round... and they stuck together quite nicely. Later of course they made them hollow stud, but not because the solid stud ones had a problem.
One part that was redesigned really irritates me... the macaroni brick... why did they redesign it with cross supports underneath. Now you can no longer stagger them in a stable column form. Looks like it's time to store up on the old (pre-2010) ones...
There's some folks on Bricklink that feel if 2 mint LEGO parts are snapped together... that they are now no longer mint... and that they should be treated as used.
IMHO... LEGO should be treated like EVERY other toy collectible..... Condition... Condition... Condition...
To use Provenance (proof of where it originated or where it's been, such as snapped together with another brick) really seems rather odd... because once a part is resold to a 3rd party... then that particular provenance (whether it's been attached to another part) is pretty much lost.
Some folks would still consider 2 parts scratching against each other for years in a sealed bag... as mint.... but 2 otherwise new unblemished parts that were stuck together... as used.
That topic has been argued over and over again on Bricklink.
Now I do concede that some parts may not have as much clutching power after assembly for many years. But I don't really see that with regular brcks (maybe some here do have bricks from batches that have lost some of their clutch).
I (very fortunately) purchased 35 (USA version 760) London Bus sets in the 1980s, and used some of the windows and red bricks in other constructions that stayed assembled for about 30 years. I recently disassembled one such building... and tested the clutching power against new bricks of the same type... I couldn't tell the difference.
Now that's not to say that this cannot be a problem... especially since the quality issue of LEGO (as well as the LEGO pelletts no longer being premixed and precoloured by the Bayer Corp.) now sometimes produces an inferior product in some parts, than say 30 years ago. And some parts (say for example minifig torso's) may be more prone to clutching issues.
But obnoxious is not a term I would use to describe storing LEGO! :)