Where Micron-Scale Fire Suppressant Granules Are Used
Granules target three application scenarios where a flat patch cannot fit. First, PCB cavities: the granules are placed directly around high-heat components such as MOSFET banks, voltage regulators, and battery charging ICs. If a component overheats, the granules rupture and release clean agent directly into the cavity, suppressing the fault before it propagates to the surrounding board. Second, sensor housings: the granules protect against thermal runaway inside lithium primary cells used in IoT sensors.
Third, battery cell headers: the granules are placed at the cell header to provide millisecond-scale response to internal short circuits. This is particularly relevant for energy-storage installations that use lithium iron phosphate cells, where the time from internal short to thermal runaway can be as short as 30 seconds.
The granules are supplied in sealed pouches with a 5-year shelf life. Each pouch contains 50g of granules, which is sufficient to protect approximately 20 PCB cavities of typical size. CHILION engineering can advise on the correct granule loading for specific PCB layouts.
How Micro-Capsule Diameter Drives Performance
The micro-capsule diameter in a cabinet-level suppression granule is the engineering parameter that drives three downstream performance characteristics: (1) activation response time, (2) suppression effectiveness per unit mass, and (3) shelf life. Smaller capsules mean faster response but lower suppression effectiveness per unit mass, because the gas yield per capsule shrinks roughly with capsule volume. CHILION granule products are engineered around the 50-micrometre capsule diameter because that diameter balances the three characteristics across the typical cabinet thermal-fault profile. Engineers specifying a micro-capsule product for a non-standard application should ask for the activation-temperature-versus-capsule-diameter curve, which is part of the technical datasheet package available on request.
50-micrometre capsule diameter balances response, effectiveness and shelf life. Curve available in technical datasheet on request.
Storage and Field-Handling Considerations
Micro-capsule products have a well-defined storage and field-handling regime that operators sometimes underestimate. The capsules are pressure-sensitive and should not be stored in high-vibration environments. The acceptable storage temperature range is -20 to +60 degrees Celsius, with continuous storage above +45 degrees shortening shelf life. Field handling rules: do not drop the canister, do not stack more than three canisters vertically, and rotate stock using first-in-first-out. The shelf-life rule is the one most often forgotten, and operators who rotate stock correctly report a useful life of 36 months; those who do not, report 18 months.
Acceptable storage -20 to +60 degrees Celsius. First-in-first-out rotation gives 36-month shelf life.
Sustainability and End-of-Life
End-of-life handling is increasingly part of procurement specifications for industrial chemistry products, and micro-encapsulated fire-suppression granules are no exception. CHILION granules are designed so that the spent-capsule residue is non-hazardous and can be disposed of through standard industrial waste channels rather than hazardous-waste channels. The full material declaration is published in the platform technical library, and it is the document that sustainability-conscious customers request during the qualification phase. Operators specifying the granule product line for a green-building-certified site have been able to claim the granule disposal route as a credit in the materials-and-waste category.
Spent capsules are non-hazardous industrial waste. Material declaration available for green-building credit claims.
Cabinet Wall Coating Compatibility
Granule products are sometimes specified alongside a cabinet wall coating, and the combination requires an explicit compatibility check because the coating substrate affects the granule's adhesion at the busbar surface. CHILION publishes a compatibility matrix covering the major intumescent coatings available on the market, and operators specifying both products should request the matrix during the qualification phase. The matrix groups coatings into three compatibility bands: full, conditional, and not-recommended. The conditional band requires a sample-panel adhesion test on the specific coating lot that will be used at the site, because batch-to-batch variability in intumescent coatings is larger than for the structural substrate.
Three-band compatibility matrix with intumescent coatings. Conditional band needs sample-panel test per coating lot.
Cabinet Cleaning Routines in Dusty Industrial Sites
Dusty industrial sites — coal handling, cement, mineral processing, wood products — accumulate cabinet-internal dust that shortens the granule product's shelf life and activates the suppression chain prematurely. The operational remedy is a cabinet cleaning routine aligned with the periodic inspection cadence: every twelve months in mildly dusty sites, every six months in moderately dusty sites, and every three months in heavily dusty sites. The cleaning routine uses a low-pressure, lint-free wipe and a vacuum cleaner, and the routine is documented in the platform service-contract standard procedure. The cabinet cleaning routine is one of the procurement line items that customers sometimes omit at tender time, and CHILION's pre-sales engineering team flags it as a mandatory line item in the standard pre-qualification guide. Sites that adopt the cleaning routine report a 40 percent extension in the granule product's shelf life, which is the operational reason the cleaning routine is positioned as a service-contract benefit rather than as an optional add-on. The shelf life extension translates into a corresponding reduction in the per-year spare-part order, which is the operating-cost case that customers use in the internal business case for the service contract.
Cabinet-Mounting Bracket Compatibility
Granule product cabinet-mounting brackets are specified for the standard switchgear cabinet profiles used across the five major OEM platforms, plus two specialty profiles for legacy cabinets. The bracket compatibility matrix is part of the standard pre-qualification pack, and customers specifying the granule product line typically request the matrix during the qualification phase. Cabinets that fall outside the standard matrix require a custom bracket, which is a workshop-side operation. The bracket selection process typically produces a per-cabinet line item in the bill of materials, and customers who pre-specify the bracket selection process during the tendering phase typically avoid a 5-10 percent cost overrun relative to customers who leave bracket selection to the field engineering team. The bracket selection output is part of the per-cabinet commissioning record, which feeds into the ICOP platform's cabinet-population map. The cabinet-population map is the operational asset the maintenance team uses during the periodic inspection cadence.
Field Trial Data Export Format
Field trial data export format is the structured output that supports the engineering review process during the platform service-contract renewal cycle. The export covers per-cabinet telemetry, per-event-response timeline, per-periodic inspection record, and the customer's per-quarter usage of the platform. The export format is published in the platform technical library and is the document most operations teams request during the renewal-cycle preparation. The export feeds into the customer's annual maintenance plan, which is the planning document the maintenance team uses to size the per-year headcount and budget allocation. The export format is part of the platform's standard operational documentation, and the format is updated annually in alignment with the platform release cadence.
Frequently Asked Questions
What is the trigger temperature of the granules?
The standard granules trigger at 170°C, which is selected for PCB applications where the normal operating temperature can reach 120°C during heavy load. A lower-temperature variant (140°C) is available for applications where the normal operating temperature is below 90°C.
Are the granules electrically conductive?
No. The granules are non-conductive and do not affect the dielectric properties of the protected board. They have been tested to 5kV dielectric strength per millimetre.
Can the granules be used in outdoor enclosures?
Yes. The granules are sealed in a polymer shell that is rated IP65. For long-term outdoor exposure, CHILION recommends placing the granules inside a secondary sealed enclosure for additional protection.
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