The Scientemp 45-6.8EX is a 6.8 cu ft low-temperature chest freezer from Scientemp's Super Cold (0 °C to -40 °C ~ -45 °C) line, reaching 0 °C to -45 °C (-50 °F). It ships with a CAL 9500 digital display, a visual/audible alarm, a key-locking door and casters and single-stage R-404A refrigeration with manual defrost - a premium mechanical-refrigeration freezer that is fully customizable to the application. This is the explosion-proof (EX) configuration, built for installation in hazardous (flammable-atmosphere) locations.
Key Specifications
| SKU | 45-6.8EX |
| Type | Chest-style laboratory freezer - explosion-proof |
| Temperature range | 0 °C to -45 °C (-50 °F) |
| Capacity | 6.8 cu ft |
| Exterior dimensions | 41"H x 60"W x 28"D |
| Interior dimensions | 17"H x 47"W x 15"D |
| Insulation | High-density fiberglass |
| Refrigeration | R-404A (single stage) |
| Compressor | 1/3+ hp (single stage) |
| Defrost | Manual (cold-wall evaporator) |
| Temperature controller | CAL 9500 digital display |
| Alarm | Visual and audible |
| Door / lock | Key-locking |
| Casters | 3" non-locking casters (locking available) |
| Running amps | 8 A (115 V) / 4 A (230 V) - base 45-6.8; EX draw confirm at quote |
| Hazardous-location rating | Explosion-proof build - Class/Division/Group not stated in available brochure; confirm at quote |
| Voltage (this SKU) | Explosion-proof (hazardous-location) build - confirm voltage at quote |
| Voltage options | Explosion-proof build - confirm voltage at quote |
Application Profile
At 0 °C to -45 °C (-50 °F), the Scientemp 45-6.8EX covers the *super-cold* band that many enzymes, competent cells, tissue samples and reagents require for stable long-term storage below the reach of a standard -20 °C freezer. Single-stage R-404A mechanical refrigeration reaches these set-points without liquid nitrogen or cascade complexity, and the CAL 9500 digital display provides closed-loop control suited to valuable inventories. The 6.8 cu ft chest format holds cold well during access because dense cold air settles into the cabinet rather than spilling out when the lid is raised (see cold-storage).
Every Super Cold is customizable: access ports (1", 2" or 4"), ramp/soak control, CO2 and LN2 back-up systems, stainless-steel interior, observation window, and internal heater/fan are brochure-listed options - so the freezer can be specified to a protocol rather than bought off-the-shelf. Choose capacity by sample volume and set-point by the coldest material you store; for -80 °C-class work, step to the Ultra Cold line (see low-temperature-freezer-selection).
Explosion-proof build. This EX model is the hazardous-location configuration of the 45-6.8 platform, for storing or siting near flammable solvents and volatile materials. The specific Class / Division / Group certification is not stated in the brochure on hand - it must be confirmed with Scientemp at quote against your site's electrical area classification. Do not assume it matches other EX models in the range.
Frequently Asked Questions
What temperature does the Scientemp 45-6.8EX reach?
Its working range is 0 °C to -45 °C (-50 °F). It reaches these set-points with single-stage R-404A mechanical refrigeration.
How much can it hold?
The 45-6.8EX has a 6.8 cu ft interior measuring 17"H x 47"W x 15"D. Exterior dimensions are 41"H x 60"W x 28"D.
Is the 45-6.8EX certified for hazardous locations?
It is the explosion-proof build of the 45-6.8. The exact Class / Division / Group rating is not stated in the brochure available to us - confirm the certified rating with Scientemp at quote against your site's electrical classification. We do not publish an assumed rating.
Is defrost automatic?
No - like all Scientemp chest freezers, the 45-6.8EX uses manual defrost with a cold-wall evaporator, which avoids the temperature swings of an auto-defrost cycle for stable long-term storage.
Can it be customized?
Yes. Brochure-listed options include access ports, ramp/soak control, CO2/LN2 back-up systems, stainless-steel interior, observation window and internal heater/fan (option availability varies by model). Specify these on the quote.
Ordering & Configuration
The Scientemp 45-6.8EX is built-to-order laboratory refrigeration; request a quote to confirm configuration and pricing. At quote, verify: set-point vs. the coldest material you store, capacity against your sample volume, voltage/electrical supply, any options (access ports, ramp/soak, CO2/LN2 back-up, stainless interior, monitoring), and freight/lead time for a unit of this size and weight. For this explosion-proof model, confirm the certified hazardous-location rating against your facility's electrical area classification before purchase.
Warranty: Per Scientemp standard terms - confirm at quote.
Positioning: the Scientemp 45-6.8EX is the 6.8 cu ft explosion-proof Super Cold (-40/-45 °C-class) chest freezer - for cold storage in hazardous, flammable-atmosphere locations. Confirm the certified Class/Division/Group rating against your site before purchase; the standard non-hazardous builds (e.g. 40-12, 45-6.8) apply where an EX rating is not required.
