PPG Protective & Marine Coatings México

Paseo Central No 66, San Juan del Río, Querétaro, México, CP 76800

+52 427 271 91 00 | www.ppgpmc.com | www.sigmacoatings.com

Villahermosa, Tab. 13 de Noviembre de 2013 Ethylene XXI Contractors SAPI de CV Ing. Rubén Bautista Martínez Quality Coordinator

Reference: Compatibility

PPG and IP products DearEngineer, First of all we welcome the opportunity and trust given to our company PPG to participate in this important project. According to the technical information provided in your request, comment, regarding the compatibility of our products Sigma and Amercoat that make each of the systems (see attached tables) applicable to metal structures which meet the standards of the specification Ethylene XXI project for the products used by the manufacturer of the structure, brand International Paint, would be fully compatible according to the physicochemical characteristics of the products described in the technical data sheets, which we can summarize the following technical aspects more important and relevant for you to be well tolerated:

PPG PRODUCTS IP PRODUCTS

FEATURE MATERIAL COMPATIBILITY SIGMA AMERCOAT

AMERCOAT 68 HS AMERCOAT 68 HS INTERZINC 42 zinc rich epoxy resin SIGMACOVER 410 MIO AMERCOAT 385PA INTERGUARD 475 HS MIO epoxy resin

SIGMADUR 550 AMERCOAT 450H INTERTHANE 990 polyurethane acrylic resin

SIGMACOVER 350 AMERCOAT 385 INTERGUARD 361 polyamide epoxy resin

It is important to tell that compatibility does not mean that there is good adhesion between the product , the latter depends on the treatment of surface preparation on product currently applied and to which he intends to apply our products, recommended preparation is as follows:

PPG Protective & Marine Coatings México

Paseo Central No 66, San Juan del Río, Querétaro, México, CP 76800

+52 427 271 91 00 | www.ppgpmc.com | www.sigmacoatings.com

"Surface preparation by any of the methods below SSPC SP -7 (Brush-Off Blast Cleaning), SSPC SP -3 (Power Tool Cleaning)) or SSPC SP -2 (Hand Tool Cleaning) , any such method is acceptable as long as it generates the necessary roughness for the PPG product can adhere to existing product mechanically and not present problems in the future " No more for now I remain at your entire orders if any questions or comments or any advice please contact us. Cordially Jesus A Mendez Avalos Commercial Manager and Technical; Southern Region NACE Coating Inspector Nivel 2 CIP No. 12964 E. jesusantoniomendezavalos@ppg.com T. +52 (427) 271 91 00 ext: 3320 M. +52 (993) 177 79 18 Ccp Mr. Raymundo Sanchez, Quality Manager Ethylene XXI Mr. Marcos Guerrero PPG PMC Engineering Manager Mexico