Permashield 431

Series 431 Perma-Shield® PL is a 100% solids, high-build epoxy liner derived from the successful Perma-Shield line and developed for the unique needs of steel and ductile iron pipe and fittings. A high loading (20% by volume) of high quality, ceramic microspheres adds exceptional abrasion resistance to an already durable epoxy film, and its low permeation rate provides an impenetrable barrier to H2S and other sewer gases and chemicals. Series 431 applies quickly in one or two coats allowing for fast and efficient through-put of pipe and fittings.

Series 431 Benefits

100% Solids Epoxy
Excellent Adhesion
Abrasion Resistant
Chemical Resistant
Ceramic Microsphere Modified
H2S Permeation Resistant

Abrasion Resistance

Method: ASTM D 4060-07 (CS-17 Wheel, 1,000 gm load 1,000 cycles).
System: Series 431 Perma-Shield PL cured 30 days.
Requirement: No more than 41 mg loss, average of three tests.
Method: BS EN 598:2007+A1:2009 (rocking abrasion).
System: Series 431 Perma-Shield PL cured 30 days.
Requirement: No more than 0.14 mm (5.5 mils) loss, average 15 point readings along pipe invert after 1,000,000 cycles.

Chemical Resistance

Method: NACE TM 01-74:2002.
System: Series 431 Perma-Shield PL cured 30 days.
Requirement: No blistering, cracking, checking, erosion, or delamination of film after 1 year continuous immersion at 72°F.
Reagents: Hydrochloric Acid 10%, Sulfuric Acid 50%, Sodium Hypochlorite 13%, Sodium Potassium Acetate 50%.
Method: BS EN 598:2007+A1:2009 (Chemical Resistance to Effluents).
System: Series 431 Perma-Shield PL cured 14 days.
Requirement: No blistering, checking, disbonding, softening, discoloration or loss of gloss following 6 months immersion, recirculated at 1.0 l/min and maintained at 64°F (18°C).
Reagents: Sulfuric acid solution, pH 3; and Sodium hydroxide solution, pH 13.

Permeation Resistance

A component of the 28 day Standard Practice for Rapid Evaluation of Coatings and Linings by Severe Wastewater Analysis Test (S.W.A.T.), Electrochemical Impedance Spectroscopy (EIS) analysis is a method that uses electrical current to determine the level of coating degradation after exposure to a testing environment. Measuring a coating’s resistance as impedance to an electrical current before and after provides a correlation to its overall performance. The higher the resistance, the lower its permeability to gases, liquids, chlorides and ions, thus the more protection it offers. As results from third party testing show below, the final impedance of Series 431 surpassed the competition, proving it to be the ultimate protection for steel and ductile iron pipe and fittings.

Test Condition:

Aqueous Solution: 10% sulfuric acid, brine (saltwater) containing 4000 ppm NaCl
Purge Gas: 500 ppm H2S
Temperature: 150°F (65°C)
Total elapsed test time: 30 days

For complete testing results, contact your local Tnemec representative.
*An updated version of this test is now certified as ASTM G210-2013.

Severe Wastewater Analysis Test (S.W.A.T.)*

EIS Coating Impedance, Log Z (Z 0.1 Hz Ω·cm2)

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Series 431 Benefits

Abrasion Resistance

Chemical Resistance

Permeation Resistance

Severe Wastewater Analysis Test (S.W.A.T.)*

Download Complete Specifications

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