It is very similar to the gelatin we eat and is not toxic. In the U. Glue is manufactured in standard grades from 32 to grams. The higher the gram strength, the stronger the cured glue, and the shorter the working or gel time.
It may be that strong only for certain tests; it is not the same as the wood itself. It is never a good idea to dilute too strong a glue to obtain lower viscosity or longer working time when it is possible to use a lower grade of glue.
Glues of different gram strengths may be mixed to get an intermediate. Now, here's an important note. The higher gram strength glues have higher molecular weight, which I'm guessing here may have slightly lower electrochemical adhesion, i.
Because the very high gram strength glues require up to twice the water to reach workable consistency, there will be less glue actually in the joint after it is clamped and the water evaporates. This may be why the very high strength glues g. Many instrument makers and repairers use liquid hide glue, but they are or should be careful to test each batch, in addition to watching the expiration date printed on the bottle. Urea will extend the working time of the glue, and will not weaken the adhesion if it is mixed with the glue just before use.
Most instrument builders and repairers try to avoid having to use urea. When a hide glue joint is clamped, thick liquid glue should squeeze out all around.
Excess glue should be washed off finished surfaces to avoid chipping the finish as the glue dries and shrinks. Theresa Posted February 19, Posted February 19, Thanks very much. Link to comment Share on other sites More sharing options Rodger Stearns Posted February 19, Theresa, I am not sure what kind of hide glue you are using.
Tom Posted February 19, But could you clarify the prep of the glue. I've been adding the water and letting it sit overnight to "gel", and then I heat it. Is it necessary to heat first, then cool to "gel", or is this to speed up the process. Another,,can you re-heat, if you have left-over??
What glue is "normally" used? I've thought of trying ready made for quick repair, instead of prepairing the crystals. Not a big chore if I have a larger project.. Guest Posted February 22, Then you apply some more glue and mate the pieces immediately together without any waiting. Clamp it and walk away and the next day it should not come apart. To tell how you know hide glue in particular the liquid hide and not titebond but OBG has deteriorated.
The proteins break down and the glue becomes very runny at normal room temperature, there is a foul odorous smell and mould begins to form. If any of these things occur its time to chuck out your bottle and buy a new one. But you would need a glue pot, hide glue and salt. To begin, you have to make hot hide glue.
You can use an electric hot plate, a saucepan, a small glass jar and a small amount of hide glue flakes or pearls, along with salt. Here are the steps: The first day, mix two parts hide glue flakes with three parts water into the jar and let everything soak.
Next, immediately stick the cooked mixture into your refrigerator for the balance of the day quick cooling is key. On morning three, fire up the burner and cook the mixture for another two hours Williams always cooks the glue twice.
Once the batch cooks the second time, you have liquid hide glue. Williams adds that he seldom makes more than a pint of glue at a time. He pours it into a plastic ketchup or mustard squeeze bottle for easy dispensing. And here is the most interesting part of home-made liquid hide glue: The salt makes this product stay liquid at room temperature and salt preserves the glue so there is no spoil date — just as salt has done throughout time in salting meat.
Hide glue has been used for thousands of years and yes it has stood the test of time the tombs are filled with furniture and caskets still held together with hide glue. Yes modern day glues are very strong in fact so strong that you will break the wood and not the glue joint but they are not reversible. What does that mean to you though, probably nothing. If you want someone in or more years to repair your now antique then hell yes it means something.
It means something to someone and it should mean something to you as a craftsman. I as a craftsman who works solely with hand tools care enough to what I put on the things I make from the finishes down to the glue. No matter what you use, use it well and enjoy your craft. Hi Salko! Believe it or not the major difficulty thing until now was the translation of the words to Portuguese.
Because here we have lots of different words to several types of animal protein glues. This week I was able to found the proper names and the glues are very cheap! Like Liked by 2 people. Like Like. Like Liked by 1 person. Very good write up Salko. I have used the Titebond and the OBG.
Both worked fine for me, but I do prefer the OBG for most of the same reasons you state above. The one thing that I have yet to try is hot hide glue.
In its dry pre-mixed state, the hot hide glue will last indefinitely.
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