Cortec M-138

Product Description

Cortec® M-138 is a VpCI® corrosion inhibitor additive for rubber and sealants. It can be used to protect metal parts in contact with or in close proximity to rubber rollers, gaskets, or manufactured parts. M-138 replaces the use of environmentally unfriendly coatings or expensive alloys in addressing the tendency of elastomers to corrode metal parts.

Cortec® M-138 is a powdered compound that can be added in low concentrations to elastomeric formulations to solve these basic corrosion problems and protect ferrous and most non-ferrous metals. The finished rubber part will contain a contact corrosion inhibitor and also emit corrosion inhibiting vapors to protect nearby metals not directly touching the rubber or sealant. M-138 opens up new design and cost savings solutions for manufacturing processes, industrial use, and any situation where there is a corrosion problem from metallic components in proximity to elastomers.

Features

• Provides multi-metal corrosion protection to finished products  
• Provides true VpCI® emitter properties to finished rubber products  
• Non-toxic and non-flammable additive

Benefits

• Allows addition of VpCI® compounds at the compounding stage  
• Gives greater design freedom in choice of materials  
• Reduces the cost of corrosion protection for metal components  
• Simplifies mix design for compounding of elastomer

Application

In most cases, a trial run of a particular rubber compound incorporating M-138 is suggested. The powder should be added to the elastomeric material at the compounding stage along with the other additives. The addition of M-138 to the rubber formulation will not typically change the physical properties of the molded rubber.

Potential applications:

• Rubberized coatings  
• Elastomeric gaskets and sealants  
• Steel belted radial tires  
• Reinforced rubber hoses and belts  
• Elastomeric parts and components  
• Elastomeric membranes for automobile roofs

Metals Protected

• Aluminum  
• Galvanized Steel  
• Carbon Steel  
• Stainless Steel  
• Copper  
• Brass  
• Bronze

Typical Properties

The General Motors Research Procedure (GMRP) is a test procedure designed to measure the degree of corrosion protection in direct contact between elastomeric gaskets and steel blocks. The table below shows results of adding M-138 to three different elastomeric compounds.

Storage and Packaging

Cortec® M-138 is available in 100 pound (45.5 kg) polyethylene lined drums. Store in a sealed container in a dry warehouse with temperature not exceeding 100 °F (38 °C). Under these conditions the shelf life is up to 2 years.