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A glass sprinkler bulb is the most reliable and economic device used to actuate a fire sprinkler head. The frangible bulb is simple to use, comprising a small thermo bulb made of glass, containing a chemical liquid that will expand rapidly when exposed to rising temperatures, bursting the glass fire bulb at an accurately pre-determined temperature, thereby activating the sprinkler.
Drawing on more than 40 years experience in glass bulb technology, Day-Impex offer a bulb for every design of head, and for every fire risk application.
A range of sizes, with diameters from 12mm down to 2.5mm, is available in lengths to suit all sprinkler frame designs, with aesthetically pleasing results.
Extensive research into formulating chemical liquids with known, precise expansion rates, ensures that all bulbs meet specific performance standards required by Approval Authorities throughout the world.
 Precision engineering and exhaustive quality control in every stage of production ensures that the 3 most critical bulb characteristics are achieved.
- Uniform and consistent size
- High mechanical strength
- Highly accurate operation temperature within tight tolerances.
- Consistent RTI values
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The entire manufacturing process carries certification to the Quality Standards of ISO9001:2000, and all bulbs meet the new European Standard, EN12259.
Day-Impex Glass Bulbs Types 937 and 941 carry UL Component Recognition in various rated temperatures.
Day-Impex Glass Bulb Types 937, 941 and 817 carry LPCB Product Approvals in various rated temperatures.
The trend to make sprinklers operate faster to suppress fire and restrict spread, has seen Day-Impex develop a progression of new glass bulb designs. Reducing the bulb diameter, but maintaining strength, researching and selecting faster-expanding liquids, has resulted in new bulbs to meet every challenge including the Residential and ESFR Standards of UL, FM, EUROPE and KOFEIS in Korea.
Below is a table showing the range of Day-Impex glass bulb sizes, their operating temperatures and the most widely used Standards met by each bulb.
Please download our latest technical specification sheets for our range of Sprinkler Bulbs by clicking the links below (all downloads are PDF format):
Type 817 Type 933 Type 937 Type 941
Type 942 Type 984 Type 989
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