From the IPS Weld-On Website:
IPS leads the plastic adhesives industry with the most complete line of solvent cements and adhesives for bonding plastics. You can count on consistent, high-quality WELD-ON® adhesives, such as 4, 10, 16, 40, 55, 66 and 4052.
Since 1955, IPS has been known worldwide for developing and manufacturing quality Weldon adhesives and cements for joining plastics and other materials. In fact, IPS was the first to produce a reliable cement for use with PVC and ABS pipe and fittings.
Today, this commitment to innovation continues along with the assurance of receiving the highest quality adhesives.
That's why we use state-of-the-art equipment, such as a gas chromatograph, FTIR spectrophotometer, colorimeter, bond strength tester and viscometer to check everything from the raw materials to the final product.
Expiration dates and storage of adhesives: The date on the can is the Manufacturing Date, not the expiration date. A tightly sealed can stored in a cool place will last 1-2 years after this date. We recommend #40 be stored in a refrigerator and then left at room temp for a few hours to warm up before mixing. Leaving any solvent glue open overnight will result in evaporation of the solvent base.
Ridout Plastics Quick Guide to IPS Adhesives
Fastest Setting. Water-Thin. Fast evaporation. Will leave markoff if spilled. Glue for acrylic sheets. Acrylic to Acrylic. Polycarbonate to Polycarbonate. Not for beginners.
Weld On #4
Fast Setting. Water-Thin. Fast evaporation. Acrylic to Acrylic. Polycarbonate to Polycarbonate. Best for most applications of these materials.
Weld On #16
Fast Setting. Syrupy in consistency. Skins over fast but slower setting. Will leave a mess if spilled. Acrylic to Acrylic. Polycarbonate to Polycarbonate. ABS to Acrylic. Multi-purpose. Good for sealing tiny gaps and water-proofing small tanks.
2 part adhesive - see IPS chart on this page. High strength. For bonding dissimilar materials. Not clear.
Weld On #40
2 part CLEAR adhesive - see IPS chart on this page. Highest strength adhesive for acrylics. This is used in making large aquariums, tanks, and glueing thick pieces of Plexiglas. It cures perfectly clear. Removing bubbles after mixing requires patience and practice.
Ridout Plastics provides this information as a reference only not an implied or express fitness of use. As with most chemicals, YOU must experiment with your materials and the adhesives for fitness of use. Many factors can affect the results you achieve, including, but not limited to the ambient air temperature, humidity, cleanliness of bond area, and quality of preparation of bonded edges.