1. What is the chemistry of Chartwell products?
All products are proprietary metal organic solutions supplied in water or various glycols. The metals used are not any of the CONEG toxic or carcinogenic metals.
2. Where are Chartwell products commercially used?
- Industrial Coatings for improved corrosion resistance (salt fog/prohesion) and improved impact (reverse/direct)
- Powder Coatings for improved corrosion resistance and reduced creep at the scribe.
- Exterior WB wood coatings for improved durability
- Adhesives for improved to adhesion to metal, plastic, rubber.
- Abrasives for improved durability (silane replacement)
- WB Flexographic inks for improved adhesion to plastic (mylar, treated PP/PE) film.
- Rubber for improved adhesion of the formed rubber article to metal, plastic, or other elastomers.
3. What are the advantages/disadvantages vs. silane adhesion promoters?
Chartwell Products are not moisture sensitive. They are soluble and stable in all water-borne systems. This is also important in SB systems where surface adsorbed moisture on pigments and fillers will contribute to silane hydrolysis.
4. How do I verify Chartwell’s water stability vs. silanes?
Prepare side by side samples: Control (no adhesion promoter), sample with silane, and sample with Chartwell adhesion promoter.
Measure adhesion (or related property, ie salt fog) at time of end product preparation. Repeat property measurement 30-60 days later. You will see a substantial decrease in properties in the silane containing sample and no decrease in the Chartwell containing sample.
5. How does the price of Chartwell Adhesion promoters compare to silanes?
Use levels of Chartwell products are generally less than the silane on an as-supplied basis, thus offering cost savings.
6. What is the recommended use level?
- Water-borne systems: 0.35 – 1.4 per cent (as supplied) based upon polymer solids.
Note: 1% is often found to be best ( Do not assume more is better!)
Post addition is no problem. Commercial used level: 3-8 lbs/100 gallons.
- Solvent-borne Systems: 0.35 – 1 per cent (as supplied) based upon polymer solids.
High Shear mixing (in grind if possible) is required.
- For “H”,”2H” and “HR” products, 0.5-1.0 per cent as supplied based upon polymer solids
- Powder Coatings: 0.5 – 1.4 parts per hundred resin (phr). For “H” products 1.0-1.4 phr. for 2H products, 0.5 – 1.0 phr.
7. Could I further improve benefits by using an increased level?
NO. We caution you that use levels higher than those recommended will actually result in a decline in property benefits.
8. How do I choose the proper Chartwell Product for my application?
Selection is based upon the polymer in your system rather than the substrate to which you wish to adhere. Product selection is easy. Refer to the bulletin RECOMMENDATIONS BY POLYMER, or the Product Selection page.
9. What is the difference between Chartwell and Chartsil products?
Chartsil products are prepared by absorbing selective Chartwell Liquid Products on a microporous silica carrier (28% silica, 72% Chartwell liquid). Chartsil Products should be used in POWDER COATINGS and RUBBER only.
10. What potential problems can occur in my evaluation?
Improper product selection in WB systems may result in gel formation.
Improper mixing in SB systems may result in gloss loss and poor performance.
11. What type of mixing is required?
- SB Systems: High Shear mixing such as a Cowles or similar high speed dissolver.
Note: Milling is not an acceptable alternative and will result in poor performance
- Rubber: Internal Banbury Type Mixer. Two and three roll mills are generally not effective.
- Powder Coating: Conventional single or twin screw extruder. The clearance between the screw and cylinder wall should be set as a low as practically possible to maximize shear.
12. How can I obtain a sample or further technical assistance?
By contacting us or your local Chartwell agent/ distributor.
You may contact us at:
Tel: (508) 943-7630
FAX: (508) 943-6527
Please let us know if you need contact information for your local Chartwell agent.