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DuPont Kalrez W240 perfluoroelastomer parts are a black product for photovoltaic wet manufacturing processes requiring a wide range of chemical resistance. W240 provides an excellent combination of properties (resistance to acids/bases) and is the product of choice for wet processes as an upgrade from standard elastomers, i.e., FKM, NBR, EPDM, etc. A maximum service temperature of 230°C is suggested.
Typical Physical Properties
| Color | Black |
| Hardness2, Shore M (O-ring) | 79 |
| 100% Modulus3, MPa | 7.85 |
| Tensile Strength at Break3, MPa | 19.08 |
| Elongation at Break3 , % |
159 |
| Compression Set4 , % 70 hr at 204 °C |
20 |
| Maximum Service Temperature5 , °C |
230 |
Features/Benefits
• Excellent resistance/low volume swell in a wide range of wet chemistries (acids/bases)
• Excellent resistance to amine-based chemistries versus standard elastomers
• Low metals content
• Very good mechanical strength/compression set properties
Suggested Applications
• Wet etch tools
• Roller applications for wet inline tools
• Wet chemical management systems
• Filter, pumps, etc., for wet process applications
Chemical Resistance
For many applications, low volume swell/weight gain (change) of elastomers is critical for proper equipment operation. Excessive swell/weight gain (change) may cause permanent seal failure due to equipment hang-up, extrusion, etc. While other physical property testing may be needed to adequately define product performance in a particular application, volume swell/weight gain (change) is an excellent indicator of resistance to chemical attack.
Table 1 provides chemical resistance (% volume swell) test data for Kalrez® W240 in various acids, bases, solvents and water. Table 2 compares the weight gain and volume swell of Kalrez® W240 versus standard FKM in an amine-based chemistry.
Table 1: Chemical Resistance, % Volume Swell
| Chemical | Exposure Time | Temperature (°C) | % Volume Swell Kalrez® W240 |
| Acetic Acid | 70 | 100 | 4 |
| Ammonium Hydroxide | 70 | 100 | 4 |
| Ethylene Diamine | 70 | 90 | 5 |
| Nitric Acid (70%) | 70 | 85 | 1 |
| Nitric Acid (70%) | 672 | 85 | 3 |
| Sulfuric Acid (98%) | 70 | 150 | 3 |
| Sulfuric Acid (98%) | 672 | 150 | 5 |
| Toluene | 70 | 100 | 7 |
| Toluene | 672 | 100 | 6 |
| Water | 70 | 225 | 6 |
Table 2: Amine-Based Chemistry Resistance (MEA: DMSO 70:30 Mixture)
| Property | Kalrez® W240 | Competitive FKM K7 |
| Weight Change, % | 1.0 | Test Specimen Melted |
| Hardness Change, pts | -3 | Test Specimen Melted |
| Surface Condition After Exposure | No Surface Degradation | Test Specimen Melted |
Warranty for Kalrez products
• Only applies to Dupont products distributed genuine in Vietnam.
• All Kalrez products are warranted if the machine fails due to manufacturer fault.
• For warranty and product maintenance, please contact Achilles, customer service phone number: 098 469 4884 (Ms. Duc).
• Achilles is the genuine supplier of products related to Kalrez DuPont.
• For retail/whole sale pricing, bulk ordering and product information advice please contact 098 469 4884 (Ms. Duc) via info@achilles.com.vn or the website https://achilles.com.vn
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