Document pmR7kqgkwjLj4EMYVKk3KpYb6

i Deep in Concrete yet Constantly Aienaced \/\ by Co r r o s io n Water seeps in thru the tiniestfissures--the metalsur face is at the mercy ofcorrosion unless properly protected / / HERE concrete is in perfect Wcontact with steel work and has not lost its caustic qualities, painting is unnecessary. But this condition is unusual. The contact is rarely perfect. Vibration and chemical action soon loosen the closest bond. When con crete has become neutralized by long exposure to air, its protective caustic lime disappears. Thru the smallest space comes moisture laden air. Water seeps in thru the tiniest fis sure. Corrosion begins. And because it cannot be reached, this corrosion is impossible to stop. The embedded steel is at the mercy of the rustforming elements. The safe practice is to paint all structural iron or steel before it is embedded in concrete or shaped brick. Three extra-heavy coats of pure red-lead should be applied to the entire metal surface. Pure red-lead is the time-proven agent for protecting iron and steel from corrosion. The sure protective qualities of pure red-lead have been demonstrated by innumerable tests, by laboratory experiments, by actual experience under every possible condition. Engineers everywhere endorse red-lead Most engineers recognize the superiority of paint made of pure red-lead. Of 206 engineers steelfloor beams in this 1!) building are sank in the cancretefloors. Atlongascement remainscaustic, corrosion does not harm the embedded stetL Butccmentauicklyabsorbs arbonicacid. This changes the caustic cement to non-proteedye carbonate of lane. The one sure protection for embedded steel is three coals of pure red-lead. answering a questionnaire on painting practice, 179 (or more than 85%) said they use, specify, or recommend red-lead for the protection of metal surfaces. And these 179 men represent every branch of the engineering profession. The highest grade red-lead obtainable is Dutch Boy red-lead. You can get it in paste or liquid form. The liquid comes in the natural orange-red for next-to-metal coats, and also in greens, browns, and black for finishing coztsThe paste is obtainable in the orange-red and can be shaded to dark colors. We maintain a special technical staff to help in the solution of painting problems. Write them in care of our nearest branch. NATIONAL LEAD COMPANY New York, JJi Broadway Boston, 800 Albany St. Buffalo, 116 Oak St. Chicago, 900 West 18th St. Cincinnati,659 Freeman Ave. Cleveland,820 W. SuperiorAve. St. Louis, 721 Chestnut St. San Francisco, 485 California St. Pittsburgh, National Lead & Oil Co. of P;u, 316 Fourth Ave. Philadelphia, John T. Lewis &: Bros. Co., 437 Chestnut: St. DUTCH BOY KBD-lEAD This advertisement appears in Engineering News-Record, January 20, 1927, Railway Age, February 12, 3927 i- I j. I I j OOOO-NLI-OOOOl 7624