Selective Micro^® products are a highly pure, neutral-pH solution of chlorine dioxide in water, which exhibit few of the compatibility issues inherent to some other "chlorine dioxide" products. For example, stabilized chlorine dioxide solutions are very corrosive due to the acidic pH and high concentration of residual reactants. Click below for compatibility guidelines (listed in order from most to least compatible for metals and plastics):

Metals
Plastics
Structural Plastics/Thermoplastics
Tubing
Elastomers

Metals:  

• Stainless steel is acceptable in general applications. (One should ensure quality of welds.)
• Brass (discoloration, but no structural problems).
• Copper (discoloration, but no structural problems).
• Chrome-plated steel (high concentrations etch plating).
• Mild steel and carbon steels may develop corrosion.
• Aluminum – specific alloys need to be tested.

Plastics:
Test Procedure
Plastics compatibility recommendations are from results of testing in accordance with ASTM D543-95: "Standard Practices for Evaluating the Resistance of Plastics to Chemical Reagents." Exposure to higher Selective Micro^® product concentrations or longer contact times could affect compatibility of certain plastics.

Test Conditions
Materials were continuously exposed to a 100 ppm solution of chlorine dioxide generated in AOAC hard water for 168 hours at room temperature.

Test Solution
The test solution consisted of a 100 ppm concentration of Selective Micro^® aqueous chlorine dioxide solution prepared in AOAC (Association of Analytical Communities) hard water.

Measurement of Chlorine Dioxide Concentration
The chlorine dioxide concentration in the Selective Micro^® solution was measured photometrically. 

Preparation of Test Solution
Selective Micro 2L500 bags were used to generate the aqueous chlorine dioxide solution. These bags are designed to generate a minimum of 500 ppm chlorine dioxide in 2 liters of water. The bags were activated by filling with two liters of hard water and allowing them to generate overnight to produce the concentrated chlorine dioxide solution. This concentrated solution was then diluted with hard water to achieve the desired chlorine dioxide concentration.

Structural Plastics/Thermoplastics:
With very slight differences, all materials tested are compatible. Continuous contact of several months or more can lead to green tint due to the absorption of gas into plastics.

• Structural Plastics.
• Poly-Vinyl Chloride (PVC).
• High Impact Polystyrene (HIPS).
• Polycarbonate.
• ABS.
• Polycarbonate Acrylonitrile-Butadiene-Styrene (ABS).
• Delrin^® (Acetal).

High Purity and Thermoplastics:

• PTFE, FEP, PFA.
• High Density Polyethylene (HDPE).
• Polypropylene (PP).
• Low Density Polyethylene (LDPE).

Tubing:

• Polyurethane.
• Silicone.
• Nylon 6 (Hydrolyzes in water, so avoid if possible).

Elastomers:

• Ethylene Propylene terpolymer (EPDM).
• Silicone.
• Viton^®.
• Buna-N 168-70.
• Buna-N 168-50.
• Avoid low durometer Buna.

Click here to view the compatibilty of the Selective Micro^® products