There are a couple of recommendations to keep in mind when using 10 to 1 dual component glues for fabricating solid surface and stone.
One of the most common misconceptions regarding 10 to 1 glues is that all dispensers provide identical performance. Based on our experience and extensive testing, we know that there are marked differences in cure consistency. Specifically, the lower cost all-metal dispensers tend to have a very high mechanical advantage. This high mechanical advantage can result in off ratio mixing of the two components if the user pulls too hard on the trigger.
To explain it another way, a high mechanical advantage in combination with operator strength will result in excessive pressure on the cartridge causing the cartridge to bulge slightly. When the cartridge returns to its original size after the trigger is released, the glue component (large side) will continue to flow out of the cartridge while the activator component (small side) will not. This problem results in an area of the bead where the 10 to 1 ratio is off and the glue bead will have “hot” and “cold” spots in the cure.
To test this theory for yourself, simply take a cartridge of glue (a lighter color will give you the best result), purge as always, and lay out a bead of 6 feet or so on wax using an excessive amount of pressure on the trigger. Every time you re-trigger, deviate from the bead a little as a mark for later. Continue to crank on the trigger and run our about a third of the cartridge. Make sure to pull hard on the trigger. This will mimic the high mechanical advantage of a lower cost gun if you are using a higher quality tool. If you are already testing with a metal dispenser, the results will be accentuated.
Observe carefully the differences in the curing material along the length of the bead. Notice how there will be sections of bead that cure significantly slower than others. If you have used a light color, you may also see areas of discoloration due to “hot spots.” These “hot spots” cure faster because there is the same ratio fluctuation. In extreme circumstances, the bead may not cure at all in small sections or the discoloration will ruin the appearance of the seam.
To solve cure issues, the answer lies in both the operator and dispenser. If you want to use an economy model for cost savings, be sure to apply even pressure on the trigger to minimize ratio fluctuation. The best option is to purchase a higher quality tool that is designed to limit the adhesive output and provide an even cure.
Remove the cap and plug from the cartridge. Purge a little to see that both the glue and hardener are flowing properly then attach the mixing tip. Place the cartridge in the gun and purge again. After the mixing tip is on, you should always dispose of the first 5 or 10 ml to make sure the mix is correct.
You can now fill the inlay area with glue. The glue should overfill the groove to allow proper sanding and finishing. There may be small air bubbles in the mix until the mixer tip is fully wetted out. Pop any bubbles at the surface with a sharp object immediately after filling the area.
It is critical to allow the inlay to cure completely before finishing is done. Allow extra time to ensure the cure is complete. Remember that the glue shrinks during the cure and sanding too early may result in a recessed inlay.
When finished with the cartridge, remember to always store it upright on its base to allow any trapped air to rise toward the outlet.
Store in a cool dry place at a temperature between 50F—70F. Do not use if the product has been exposed to high temperatures for an extended period of time. The cartridge should be stored standing upright and purged immediately after removing the nose plug to eliminate any air that might be trapped in the cartridge. Use within 24 months of date of manufacturer. The product can be stored with the mixer tip attached as long as the outlet is clean before attaching a new mixer tip.
Only use the recommended and supplied mixer tips that have been engineered for the supplied cartridge. Use mixer tips that are clean and free of any blockage. If the material has started to gel in-between jobs then discard and reuse a new mixer tip.
Use a recommended dispenser that is in good working order and free of broken parts. Dispensers with a higher mechanical advantage can cause problems of off ratio mixing. To minimize off ratio mixing use light constant pressure on the trigger and do not force the adhesives out of the cartridge.
Cold Sheet Goods
Bring the sheet goods to a temperature of 60F—70F before fabrication. Glue that is dispensed and used on cold sheet goods may not fully cure resulting in lower bond strength.
Glue that has been stored in a refrigerator must be brought up to room temperature before use. The product may not mix correctly if it is too thick to pass through the mixer tip or may not achieve enough heat to trigger the chemical reaction. To avoid damage do not heat past 100F
Use the correct trigger action to achieve on ratio mixing. Apply and maintain constant pressure on trigger; do not stop and let adhesive run on in-between strokes. Once you come to the end of a stroke, rapidly re-trigger the dispenser and maintain the constant pressure once again until either the job or cartridge is completed. If the dispenser is set down for any amount of time, purge the contents of the mixing tip to ensure a correct ratio is present in the mix.
While it is always best to use the recommended glue color match, it is not always possible. Stealth is a glue specially formulated to work on many different sheet colors. It is recommended to always have some on hand as it will get you by in a pinch. Stealth blends in to match the surfacing material when a nice tight fit is achieved for seams and laminations.
Follow the instructions below to achieve a tight fit and near invisible seams:
- Machine both edges to be seamed.
- The seams or edges should fit tight when dry fitted.
- A good dry fit should have no visible voids along its entire length.
- Clean seams or edges with denatured alcohol with a clean white rag.
- Use tape on the bottom of the seams so the adhesives do not come in contact with the table.
- Clamp the seams together; make sure there is glue squeeze out along the entire seam (Do not over tighten clamps!).
- Remove cured glue squeeze out with a router on “skis,” a surface leveler, or a random orbital sander.
- Do not scrape, chisel, or use belt sander on seam.
- Finish sanding to complete.
When dealing with dual component adhesives such as Seam-it™, there are a number of variables within the system that all work together to ensure a proper ratio mix and even cures. This is especially true when considering cartridge based delivery systems but also applies to older, hand-mix types of glue. The proper mix ratio is essential if you want to achieve the bond strength and cure consistency of any dual component adhesive formulation.
As mentioned earlier, temperature is a key factor in proper adhesive application and performance. Some fabricators will store adhesives in a refrigerator to extend shelf life. Using a cold adhesive will not only extend the cure time, the thicker material is not as easily dispensed. The higher back pressure can cause off ratio mixing and a spotty cure. If you choose to store your adhesives below the recommended operating temperature, they should be acclimatized before use to get the best results.
Another cause of an uneven cure is air entrapment in the adhesive cartridge. Manufacturers of cartridge based adhesives work hard to eliminate any air during the filling process as it is a known issue when dealing with meter- mix -dispense adhesive delivery systems. This is also the reason you should purge the cartridge before attaching a mixing tip to ensure a good flow of both components before applying adhesive to the joint.
There are two ways to determine if there is air trapped in an adhesive cartridge. First, an adhesive cartridge with a trapped air pocket will feel spongy in the dispensing gun. This can also be tested by applying pressure to the pistons in the end of the adhesive cartridge. If you are able to move the pistons by pushing on them, this points to air entrapment and the cartridge should be purged again to remove it. The second method for determining if there is air trapped in the adhesive is to dispense a typical adhesive bead and then set the dispensing gun down and observing the amount of adhesive that continues to run out of the tip. If a significant amount of adhesive runs out of the tip after the trigger pressure has been released, there is likely an air pocket and the cartridge should be purged again before use.
Finally, the dispensing gun itself and the proper application technique can have a substantial effect on the adhesive cure consistency. If you experience a cure that is uneven, inspect the dispensing gun for defects or worn components. With the steel type dispensing guns, a bent push rod or outer carriage may cause an off ratio mix and uneven cure. Operator technique can also have an adverse effect as exerting too much pressure on the trigger will cause a rise in back pressure and increase the chance of an off ratio mix. Even pressure throughout the bead will keep the ratios constant and provide the best results.
These are just a few of the questions we get in our daily communications with fabricators. Having a better understanding of adhesives and how they work will hopefully help to improve the performance of the adhesives they find work best for them.
The boat was constructed at Cree Yacht Design in Poland and SCIGRIP, a global supplier of smart adhesive solutions, sponsored the team and provided on-site technical support and a range of high performance, structural methyl methacrylate (MMA ) adhesives throughout the prototyping phase and build process.
SciSGrip wins First in Class at the 2014 DONG Energy Solar Boat Challenge
The SCIGRIP Solar Boat crew consisted of a dedicated group of engineers with a vast knowledge of the marine industry, composites technology and the application of specialist adhesive products.
SCIGRIP’s two component, high viscosity MMA adhesive, SG 230HV was used to bond the largest and most demanding joints such as the bulkheads, engine column and floater beam sections. The product has a 10:1 mix ratio with adjustable cure rates ranging from 30 to 120 minutes.
Skipper Bartosz Puchowski states, “SCIGRIP’s adhesives were very straightforward and easy to work with. For the larger structural sections we applied SG230HV which offers a range of working times, is lightweight, easy to apply and exceedingly strong.”
For applications where substrates have to bond and cure more rapidly and where unprimed metals might be one of the components, SCIGRIP’s SG300-05 has been applied in areas such as the perimeter of the electrical box. A black formulation of SG300 was also used to bond the deck to the hull, allowing the joint to blend seamlessly and be hidden from view. SG100 White has been used to adhere the structure’s floats to the deck and also provides UV protection and resists discoloration if the glue line is exposed.
For information on how SciGrip’s Structural adhesive products can work for you in a marine application, contact the author below.
Glue Warehouse, Sumas WA has been accepted as a member of the Marble Institute of America (MIA), the largest global trade association representing the dimensional stone industry. All members are committed to the highest standards of workmanship and ethics.
Jeff Handley, MIA Member Relations Manager said, “Chad Thomas and Gluewarehouse can proudly display the MIA member logo, which symbolizes that they are a member of the leading natural stone association in the world, and they strive to adhere to the MIA’s code of ethics. MIA members truly support the industry they serve, and are the best the natural stone industry has to offer.”
About Glue Warehouse
With 8 national warehouses, strategically located across the USA, Glue Warehouse is an on time supplier of adhesives, silicones and related products to fabricators of natural and made man stone. Color matched adhesives and silicones, and various accessories are available for fast delivery and can be ordered online through a dynamic webstore.
To learn more about Glue Warehouse visit www.gluewarehouse.com, or contact Chad Thomas at 877-595-4583.
Posted in Fabrication of Solid Surface, Stone glue, Tools and accessories, Uncategorized
Tagged Blanco, Cambria, Corian, fastening hardware, Furst, Granite, Integral Bowl, laminate, Pelican, Silgranite, Soci, stainless steel sink, undermount
Glue Warehouse is excited about joining the Stone Fabricators Alliance as a new Guardian Sponsor. The SFA, as its commonly known, is a grass roots industry association that is still run by its membership.
Excerpt below from their excellent website:
Welcome to the home of the Stone Fabricator’s Alliance, an organization comprised of fabrication and restoration professionals from around the world. Our objective is to provide the resources necessary to enable our members to prosper by improving their quality of fabrication and restoration methods and practices. We do this by sharing information, skills and techniques all for the good of the hard working professionals that make up this fantastic industry.
The SFA is supported by companies, like Glue Warehouse, who value sharing of information and ideas for the betterment of the industry as a whole. The SFA puts on multiple regional events every year where fabricators get together and learn about the newest techniques, equipment and trends in dimensional stone. In addition, they have a huge presence at the annual Stone Expo event where they perform product demonstrations and generally have a great time. SFA Rocks!
Greenguard and LEED certification are becoming more and more important when it comes to adhesives used in countertop fabrication.
Many specifiers are now insisting on products that meet the stringent standards set by Greenguard regarding the amount of Volatile Organic Compounds (VOC’s) that are present in adhesives, sheets and building materials in general. At Gluewarehouse, we want to provide you every opportunity to land projects and bids that require “green” manufacturing. Adding the Greenguard certification to our Seam-it product line can help you secure some commercial projects that specified green friendly.
In addition, we have LEED certification information sheets available that are easy to use and will help get you the LEED points you deserve.
You can find all the relevant information by clicking on this link—> Technical Page
Posted in Cure Issues, Fabrication of Solid Surface, Stone glue, Tools and accessories, Uncategorized
Tagged Corian, Countertop, greenguard, leed, seaming, Solid Surface, Solid Surface Glue, voc, volatile organic compound
Whether you are fabricating Corian, Cambria or Natural Granite: the next generation of Seam-it adhesive is designed to produce faster curing, effective bonds in ready to use colors.
One of the properties of stone that makes it such a challenge from an adhesive standpoint is its ability to conduct heat. When you place your hand on a granite or quartz countertop in a house it always feels cold, even if the ambient air is quite warm. The high thermal conductivity of stone causes the heat to be pulled away from your hand leaving the countertop to feel cold to the touch. This phenomenon is known as “Heat Sink”. The same thing happens to the adhesive in a seam or a lamination. The adhesive needs a greater amount of heat energy to cure, and it is important that the “heat sink” effect is considered when formulating an effective product for stone.
One way to do this is to use a “hot” activator and overpower the thermal conductivity of the stone- effectively pushing the cure through. While this can be effective, there are usually a couple of undesirable side effects.
First, using a “hot” activator produces higher cure temperatures and may discolor some of the lighter shades. Second, a lower overall bond strength is usually the end result. This is especially true in Solid Surfaces due to the unbalanced nature of the formulation.
A better, although more difficult approach, is to formulate based on carefully measured polymeric chain chemistry, keeping the peak exothermic temperature within an acceptable range while reducing the overall cure time and maintaining an effective bond strength.
The results speak for themselves. Give us a call or order a sample of the new formula today.
Posted in Color Matching, Stone glue, Uncategorized
Tagged Cambria, color match, Corian, Countertop, Gibraltar, Granite, Hanex, Hanstone, HiMacs, Integra, invisible seam, Livingstone, Plexus, seaming, Solid Surface, Solid Surface Glue, stainless steel sink, Staron, Zodiaq