Gas detector & fire safety specs & selection guide sensors, gases, power, alarms, materials, packaging, MOQ and documentation

• Semiconductor (metal-oxide, MOS) — a heated metal-oxide layer whose resistance drops when combustible gas is present. Broad response to methane, propane and butane; cost-effective; the standard choice in household plug-in and 12 V gas alarms. Needs continuous power for the heater and a warm-up period; calibrated per target gas.
• Catalytic bead (pellistor) — gas burns on a heated catalyst bead; the temperature change is read as % of the lower explosive limit (%LEL). Linear, gas-specific readings; common in handheld and professional instruments; higher power draw; some contaminants such as silicone vapors can degrade the bead.
• Electrochemical — a cell that produces a current proportional to the target gas; the usual sensor for carbon monoxide. Very low power, so it suits battery alarms; finite sensor life, which is why CO alarms carry an end-of-life signal and a replace-by date.

Other technologies (for example infrared) exist for specific gases and professional uses; quote on request.

• Methane (natural gas) — lighter than air; detectors mount high on the wall or near the ceiling. See natural gas detectors.
• Propane / butane (LPG) — heavier than air; detectors mount low, near the floor. See propane gas detectors.
• Carbon monoxide (CO) — roughly the same density as air and mixes with it; CO alarms are mounted per each model’s instructions. See the CO section.

Combustible gas alarm set points are expressed in %LEL; CO alarm points in ppm with time weighting. The actual set points are defined by your market’s standard and are specified per SKU and confirmed with documentation per order.

• 120 V plug-in (US plug; other plug types for other markets), with or without battery backup.
• Hardwired 120 V or low-voltage, often with battery backup and relay output; installed by electricians in projects.
• 12 V DC for RVs, vans and boats, flush- or surface-mount.
• Battery — replaceable or sealed long-life cells; natural fit for electrochemical CO alarms; battery combustible gas alarms use low-power sensor designs.
• Rechargeable / AA for handheld leak detectors.

The alarm sound level (dB) is usually specified as a minimum level at a stated distance, as required by the standard of your market; it is specified per SKU and confirmed with documentation per order. Other alert options: flashing LED, voice alarm, digital %LEL / ppm display, peak memory, test / hush button, fault and end-of-life signals. Outputs on hardwired and 12 V models: relay or 12 V output for a gas shutoff solenoid valve or exhaust fan; smart connectivity (Wi-Fi / Zigbee) and interconnect on selected platforms.

• Woven fiberglass — base fabric for fire blankets; edges hemmed or bound.
• Silicone-coated fiberglass — flexible, printable, reduces loose fibers; the standard outer fabric for fireproof document bags and some blankets.
• Aluminum-foil laminates — optional reflective layer in bags.
• Steel shell + insulating fill + heat-expanding seal — fireproof safe construction; water-resistant gaskets optional.
• Steel or aluminum rungs, polyester / nylon webbing or steel chain, coated steel hooks — fire escape ladders.

Fire resistance, water resistance and load capacity depend on the full construction and are specified per SKU and confirmed with documentation per order. This site publishes no ratings.

Detectors: pad print or silk-screen on the housing, color-matched housings on larger runs, back labels, manuals and clamshells or color boxes. Safes: powder-coat color, logo plate, keypad graphics, cartons with foam corners. Blankets and bags: screen print or heat transfer on pouches and coated fabric, header cards, color boxes. Ladders: printed boxes, labels and storage bags. Barcodes and marketplace (e.g. FBA) labels are applied per SKU; manuals are written or adapted with your team and approved before printing.

What drives MOQ:

• Platform — an existing detector, safe, blanket, ladder or bag design with your logo starts lower than new housings, features or molds.
• Colors — housing plastics, powder coats and silicone coatings have minimums per color.
• Logo method — molded or color-matched housings have setup minimums; pad printing and labels start lower.
• Packaging — printed boxes, clamshells and kits have their own minimums; neutral boxes with a label start lower.
• Documentation — new or market-specific testing adds time and may set a practical minimum per SKU.
• Mixed SKUs — combining detectors and fire safety SKUs helps fill a shipment even when each SKU is small.

MOQ and lead time are quoted per SKU on every quotation; no prices are published. Send your RFQ via the inquiry form.

We do not hold out certifications, listings or ratings on this site. Documentation is handled per order:

1. At the brief stage you tell us the destination market, sales channel and any retailer, marketplace or code requirements.
2. We identify, per SKU, which test reports or certification documentation apply — for example the safety standard for the detector type in your market, electrical and radio requirements for powered or smart units, battery transport documents, material declarations, and fire-resistance or load testing for safes, blankets, bags and ladders.
3. What can be provided — existing reports for a platform, or testing arranged with a third-party laboratory — is confirmed per order for your market on the quotation, before production.
4. Labels, manuals, warnings and packaging claims are approved by your team; they must match the documentation for that SKU.

Detectors complement — they do not replace — professionally installed and code-required alarms. We make no life-safety guarantees; labelling and claims are the brand owner’s responsibility.