Competitive Comparison
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PARAMETERS
 STANDARDS’
REQUIREMENTS
 MAHIP SALT
SPRAY APPARATUS
 COMPETITIVE
CHAMBERS
Temperature Control
 Of Chamber Atmosphere
 Chamber Atmosphere
 Salt Solution
Precipitation Rate of
Fog
 1-2 ml/80sq.cm./hr
 1-2 ml/80sq.cm./hr
throughout
 No measurement/
Control At best,  point
control
pH of Sprayed Sol.
 Consistently in Range -
6.5-7.2/ 3.1-3.3
 Consistently in Range
 At best, erratic control
Humidifier
 Necessary. With
Continuous Level Control
 Present With Continuous
Level Control
 Usually no humidifier
present
Heater-Electrical
 Not permitted  inside
the Chamber
 Not present inside
Chamber
 No Immersion/ air
heaters present inside
the chamber
Construction
 No metal permitted
inside Chamber
 No metal present inside
Chamber
 SS Spray nozzles, etc.
present inside
Chamber.
Capacity
 15c.ft. / 400 Lt minimum
 431 Lt/ 15.2 c.ft.
 150-200 Lt.
Consistency of Results
 Consistent throughout
the year
 Consistent throughout
the year
 Inconsistent even
during day & night.
Recycling of Spray
Solution
 Solution once sprayed
should be disposed off
 No recycling
 Recycling
Fog Venting
 To be provided
 Provided
 Not provided.
Digital Temp Display
Logging & Control
 -
 Provided
 Usually Not provided
Integrated Castor
mounted Model
 -
 Fully integrated
 Not integrated
Direct Impingement of
Spray
 Not Permitted
 Continuous Deflected
Super Fine Fog/Mist
 Intermittent Direct
spray of Solution
droplets.
Electrical Safety
Features
 -
 Provided
 Not Provided
Failure prevention
tech.
 -
 Provided
 Not Provided
Test validity check
(audit) facility
 -
 Provided thru proprietary
software
 Not possible
Dependence on
trained operator
 -
 Low
 High
The conventional Salt Spray Apparatus having a plastic chamber fitted with spray nozzle using salt water and pressurized ambient air fails to meet even the principal specifications of ISO 9227 on Chamber temperature and Precipitation Rate control, which are necessary for valid evaluation of test samples. Most of these equipment control the temperature of the salt solution (not chamber atmosphere) using electric immersion heaters. A few use glass encased air heaters inside the chamber or immersion heaters in the chamber walls to heat the chamber. While the former have little control over chamber temperature, the latter have large temperature gradients spanning upto 10°C. This coupled with no or improper precipitation rate control leads to unpredictable results and very poor test consistency. For example, two identical samples drawn from the same will give different exposure values in summer and winter, or even day and night!

Mahip Salt Spray Apparatus employs innovative process control technologies to accurately control chamber temperature within 1°C (without use on any immersion/ air heaters inside the chamber, as required by the Standard) at all points in the chamber. The precipitation rate is also controlled at all points in the chamber. The end result is CONSISTENCY. Your test results become unquestionable. But before that, your processes improve to a level that your products and anti-corrosion processes rise above suspicion.

Mahip Salt Spray Apparatus is now equipped with the State-of-the-art Programmable Logic Controller and a (Windows/Linux based) Real time OS based 7” Touchcreen type Human Machine Interface. Plainly said, the machine has now a much reduced dependence on a trained operator. Besides, the inbuilt Datalogger keeps a record of the chamber temperature every two minutes. A record of about last 1000 hours can be accessed to assess the authenticity of the testing procedure.
Salt Spray Test Chambers India, Salt Spray Apparatus India, CASS Test India, SST Chambers India, Salt Fog Testing India, ASTM B117, ASTM B368, ISO 9227, JIS Z 2371