51-00-1035-1000

FAQFrequently Asked Questions

• What are the key differences between CHO-BOND® 1035 and standard non-conductive silicone sealants when designing RF shielding enclosures? CHO-BOND® 1035 is a conductive silicone sealant specifically formulated to provide EMI/RFI shielding continuity along seams and gaps in enclosures, whereas standard silicone sealants offer only mechanical sealing without electrical conductivity. The 51-00-1035-1000 formulation maintains conductive paths that prevent electromagnetic energy leakage, which is critical in RF applications operating above 1 MHz where non-conductive sealants would compromise shielding effectiveness. Standard sealants may require additional conductive gaskets or shielding tape, increasing assembly complexity and cost.
• How should CHO-BOND® 1035 be applied to achieve consistent EMI shielding performance across a sealed enclosure? The 51-00-1035-1000 should be applied in a continuous, uniform bead along all seams and penetrations where EMI leakage paths may exist. Surface preparation is critical—remove oxides and contaminants from mating surfaces to ensure intimate contact between the conductive sealant and the enclosure material. Application thickness should be controlled to maintain adequate conductive cross-section; typically 2–4 mm provides sufficient shielding while remaining cost-effective. Inadequate coverage or interrupted application of CHO-BOND® 1035 can create high-impedance gaps that degrade shielding effectiveness.
• What is the shelf life of CHO-BOND® 1035, and how does storage temperature affect usability? The 51-00-1035-1000 has a shelf life of 6 months from the date of manufacture when stored at 77°F (25°C). Storage above this temperature or in fluctuating thermal conditions accelerates crosslinking and viscosity increase, reducing working time and application quality. If the 6-month shelf life window is exceeded, the material may become too stiff to dispense properly or achieve adequate flow for seam sealing. For high-volume manufacturing environments or extended inventory management, verification of manufacture dates and adherence to storage temperature specifications is necessary to maintain process consistency.
• Can CHO-BOND® 1035 be used as a direct replacement for elastomer-based EMI gaskets in existing designs? The 51-00-1035-1000 offers a viable alternative to pre-formed elastomer gaskets in many applications, but design modifications may be required. Sealant-based approaches eliminate gasket compression-set issues and provide better conformability over irregular surfaces or multiple seam segments. However, elastomer gaskets typically offer faster assembly cycles and defined compression forces; sealant application requires cure time, typically 24 hours for full crosslinking. For applications with tight manufacturing timelines or where rapid enclosure assembly is critical, the 51-00-1035-1000 may introduce scheduling constraints compared to gasket alternatives.
• Is CHO-BOND® 1035 suitable for use in high-vibration or thermal cycling environments? The silicone base material of the 51-00-1035-1000 provides good flexibility and resilience, making it relatively tolerant of moderate vibration and thermal cycling. Silicone's lower modulus compared to rigid potting compounds reduces stress concentration at interfaces, which helps maintain adhesion during thermal expansion/contraction cycles. However, the exact operating temperature range is not specified in the product parameters; applications involving extreme cryogenic or high-temperature exposures (above 200°C continuous) require manufacturer guidance. Long-term vibration testing should be conducted in design validation to confirm that the sealant does not delaminate or lose conductive integrity under specific operating conditions.
• How does the conductive mechanism of CHO-BOND® 1035 compare to conductive coatings or paints in terms of long-term reliability? CHO-BOND® 1035 maintains conductive properties through particulate fillers dispersed within the silicone matrix, providing a more stable and durable conductive path than many conductive paints, which can flake or degrade over time. Unlike thin coating layers, the bulk sealant in the 51-00-1035-1000 formulation offers mechanical protection for the conductive particles and reduces the risk of loss of conductivity due to abrasion or environmental exposure during assembly or field service. In applications where the EMI seal experiences mechanical handling, vibration, or repeated thermal stress, the 51-00-1035-1000 generally exhibits superior long-term reliability compared to conductive paint alternatives.
• What compatibility considerations should be evaluated when using CHO-BOND® 1035 with different enclosure materials? The 51-00-1035-1000 is based on silicone chemistry and exhibits good adhesion to metals (aluminum, steel, copper) and many plastics (ABS, polycarbonate). However, adhesion to certain elastomers or specialty polymers may be limited. Compatibility testing is recommended before large-scale production, particularly for enclosures with painted or powder-coated surfaces, as adhesion strength depends on substrate cleanliness and surface energy. Additionally, some composite materials or low-surface-energy plastics may require primer or surface treatment to ensure lasting bond with the 51-00-1035-1000 sealant.
• How does the 71g bulk packaging of CHO-BOND® 1035 affect dispensing and application consistency in manufacturing? The 51-00-1035-1000 is supplied in bulk 71g cartridges, which allows controlled dispensing via manual or pneumatic dispensing equipment. Bulk packaging reduces per-unit material cost but requires attention to dispenser calibration and bead width consistency. Operators must monitor cartridge pressure and nozzle wear to maintain uniform application of the 51-00-1035-1000 across production runs. Incomplete dispenser purging or pressure variations can introduce inconsistencies in sealant bead uniformity, which may lead to localized shielding effectiveness variations.
• What are the RoHS and REACH compliance implications of specifying CHO-BOND® 1035 in medical or aerospace applications? The 51-00-1035-1000 is ROHS3 Compliant and REACH Unaffected, meeting primary environmental and chemical safety regulations for many industrial markets. However, medical device or aerospace applications may impose additional material certification or biocompatibility requirements not captured by standard RoHS/REACH status. Customers in regulated industries should verify that the 51-00-1035-1000 meets specific FDA, ISO 13485, or AS9100 material qualification standards applicable to their application before design release.
• How should cure time and environmental conditions be managed when applying CHO-BOND® 1035 in low-humidity or temperature-controlled manufacturing environments? The 51-00-1035-1000 is a silicone-based sealant that typically cures through condensation of silanol groups; cure rate is influenced by humidity and temperature. In very low-humidity environments (below 30% RH), cure may be extended; in high-humidity conditions (above 70% RH), cure accelerates. Manufacturing environments with tight climate control should verify actual cure times empirically, as the 51-00-1035-1000 performance may deviate from standard conditions. Process windows for handling or moving sealed assemblies should account for environmental variability to avoid mechanical disturbance of the sealant before full crosslinking is achieved.