Intersurgical Intersorb Plus Soda Lime CO2 Absorbent
Pack Sizes Available
Product Description
Technical Specifications
- Product Type: Soda lime CO2 absorbent for anaesthesia circle systems
- Indicator: White (fresh) to violet (exhausted) pH-sensitive dye
- Pack Sizes: 1 kg, 1.5 kg, 2 kg canisters; 4 kg bulk bag
- Composition: Calcium hydroxide, sodium hydroxide, water, hardening agents, pH indicator dye
- Degradation Products: Reduced compound A and CO formation vs. standard soda lime
- Manufacturer: Intersurgical Ltd., UK
Frequently asked questions
Soda lime is the CO2 absorbent in closed and semiclosed anaesthesia circle breathing systems. Exhaled CO2 must be chemically removed before expired gas is recirculated to the patient. The calcium hydroxide and sodium hydroxide in soda lime react with CO2 to produce water and calcium carbonate, enabling efficient low-flow anaesthesia with reduced agent consumption.
Intersorb Plus uses a pH-sensitive dye that changes from white (fresh) to violet (exhausted) as the calcium hydroxide is consumed and the absorbent's pH transitions. The colour change starts at the canister inlet and progresses toward the outlet. When more than half the canister has turned violet, the absorbent should be replaced.
Intersorb Plus has a modified formulation that reduces production of compound A from sevoflurane and carbon monoxide from desflurane and isoflurane in low-flow and minimal-flow anaesthesia conditions where degradation product concentrations can accumulate to clinically relevant levels.
Duration depends on total CO2 absorbed. A typical adult produces approximately 200 mL/min of CO2. A 1 to 1.5 kg canister in a circle system may last 6 to 12 hours or more of adult anaesthesia. Canisters should be changed based on indicator colour change rather than clock time alone.
Apparent colour reversal after resting does not indicate restored absorptive capacity. The chemistry of exhausted soda lime cannot be regenerated. Granules showing apparent colour reversal are still exhausted and must not be returned to service.
Exhausted soda lime should be disposed of per local hospital waste management and environmental regulations. It is typically treated as general clinical waste. The canister should be sealed before disposal to prevent dust exposure to personnel. Soda lime dust is irritating to mucous membranes and respiratory tract.
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