Filiform Test Chambers

Stability Chambers - Filiform Testing 

SP Scientific Reach-in Chambers are constructed entirely from Stainless Steel, inside and out. The inner Filiform Testing chamber is made from 316 Stainless Steel to withstand the harsh environment created by the samples during the Filiform test.


Hotpack 33FT



  • Stainless Steel interior and exterior
  • Accurate temperature control
  • Microprocessor based PID controls
  • StabilityPLUS™ Airflow
  • Solid door as standard


Hotpack model 33FT is a high quality Temperature and Humidity Stability Chamber, built to exceed the exacting standards required for Filiform Corrosion Testing, following the NAS 1534, EN3665 and GM9682P test methods. The key to successful testing is to reach and accurately maintain the required parameters during the entire test time.

The Filiform Test Stability Chamber is constructed from 316 Stainless Steel inside, with the exterior 304 Stainless Steel surface painted as extra protection. The interior is unpainted allowing easy cleaning and resistance to corrosion from the aggressive atmosphere produced during the test. Each unit is supplied with 4 solid stainless steel shelves which locate into 4 pilasters, and these serve to hold the shelves rigid and bear the load of the samples being tested. There are 19 available shelf positions to allow high density testing if required. The chamber is vented at the top to allow vapors to escape to the outside or into a fume hood.

A microprocessor based PID controller allows extremely accurate temperature performance and ensures that the chamber performs well within the specified test limits. The controller also has user settable over- and under- temperature limits and audible/visual alarm systems which alert the user to events such as power interruptions.

The key to uniformity in any Chamber is the StabilityPLUS™ airflow, which ensures all parts of the chamber are constantly supplied with conditioned air at the correct temperature and humidity. The Stability PLUS™ design ensures there are no hot or cold spots anywhere in the chamber and the gentle nature of the airflow ensures that any samples are not subject to forced evaporation.

Scribed, painted samples are placed in a corrosion chamber which has been saturated with acidified salt solution for 1-6 hours. Samples are removed from the acidic atmosphere and placed in the environmental chamber that is set to a specific temperature and humidity. Precise environmental control is important, since temperature and humidity play major roles in filiform propagation. The Filiform Test Chamber constantly measures and maintains this condition. Standard exposure time in the environmental chamber is 1000 hours or as specified.





Specifications: Hotpack 33FT 

Chamber Volume 33 cu ft 
934 Liters
Chamber Dimensions 33”w x 27”d x 60”h 
84cm x 69cm x 152cm
External Dimensions 41”w x 35”d x 90”h 
104cm x 89cm x 229cm
Temperature range 35°C to 70°C
Control Resolution 0.1°C
Humidity range 20% - 96% RH
Control Resolution 0.1°C
Uniformity at 37°C + 2°C
Heat-up time: Amb-37°C 7 minutes
Heat-up time: 10°C - 50°C 22 minutes
Recovery time at 37°C** 1.25 minutes
No. of shelves supplied 4
Max no. of shelves 19
Shelf area (each) 6 sq ft (0.5 sq M)
Electrical Services 220V, 1Ph, 50/60Hz 
2.0kW, 16A
Shipping Weight 1,000 lbs; 454 Kg


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