PC 88 Adhesive

I'll give the cynic a "good answer" for this. If you use the adhesive and have a failure later your liability is going to be over the top.

Of course if the adhesive was stored under optimal conditions it might be OK but that requires a call to the manufacturer of the adhesive and some testing to be sure it is still good. The manufacturer can tell you how to test as well.

But I'll bet that the manufacturer won't help you with out of date adhesive as they would then be assuming some of the liability. Plus they want to sell you more adhesive.

If a delay by the customer caused you to wait until the adhesive was past the expiry date I would order new adhesive and charge the customer for it. Plus markup, of course....

"But I'll bet that the manufacturer won't help you with out of date adhesive as they would then be assuming some of the liability. Plus they want to sell you more adhesive."

Unless you convince the manufacturer to sell the chemical to "recondition" the aged adhesive, to save the liability of disposal of environmentally hazardous material bearing the manufacturer's label. Saving product and helping a customer can be in the manufacturer's best interest. If they do a good job, they get a good reputation and keep a happy customer.

Call the manufacture and see what makes it expire you may be able to add what ever has ages like the thinning component. May onlt requiew some Tuloene or Acteone.

Here are the spec papers from a manufature

I believe the problem you face would come from the 2nd compoent of the product but I am not postive. The quality control people in the manufacturers plant would be the best source of infomation.

http://www.foamglasinsulation.com/msds.asp

Expiration dates are predictions, based on standard storage conditions among other things. Just like the expiration date on a bottle of milk, it is usually conservative. Do you throw out the milk the day after the exp date? I check it out and use it if it's OK.

In this case, I think you need to check it out and consider the consequences of using expired adhesive. Then you can decide to use it or not. I would also ask the manufacturer what conditions might postpone degradation of the material.

The experation date on curatives is generally set based upon the viscosity change for the A or B component. The test point is generally doubling of the viscosity as the absolute end point. You then put your engineering safety, ie cut the test point time by 4 (for most curative materials, ie epoxide, polyesters, urathanes). So if you have a shelf life of 6 months this in general means that the manufacuture contract warrenty will be in effect, after that date, you are on your own. The blowing agent may be a touch off too with the PC 88. I suggest testing the material. If the visocity has not shifted, and the Dynamic DSC shows no shift from new material, then use it, but not for too long. You can also off the material on the secondary market (ie China). They will use it, and do all the time.

In this case the part A is not an issue. The curative Dyci will degrade over time decreasing the stociometeric ratio required for a stable cured product. However, the exp date is set at 1/2 the time at temperature it take to reduce the mix ratio curative stociometry by 5%. If your exp date is say June, July, Aug. I would not worry about it. However, Jan, Feb, March, send it to the secondary market.