| Size（mm） | Temperature Rating（℃/°F） | Color | |
| A | 3.8 | 57℃ / 135°F | orange |
| B | 2.02 | 68℃ / 155°F | red |
| C | <4.5 | 79℃ / 175°F | yellow |
| D | 5±0.1 | 93℃ / 200°F | green |
| d1 | 5.3±0.2 | 141℃ / 286°F | blue |
| d2 | 5.3±0.3 | ||
| L | 24.5±0.5 | ||
| l1 | 20±0.4 | ||
| l2 | 19.8±0.4 | ||
| Glass bulb load（N） | Average Cursh load（X） | 4000 | |
| lower Tolerance Limit（TL） | ≥2000 | ||
| Maximum clamping torque | 8.0 N·cm | ||
| Response time index（m*s）0.5 | 80＜RTI≤350 | ||
This product may also be referred to as:
Frangible Bulbs Glass Sprinkler Bulbs Thermo BulbsProduct Description
Sprinkler bulbs are thermally actuated release elements for automatic sprinklers, smoke vents, fire dampers and other release devices. A hermetically sealed liquid in the glass bulbs expands with rising temperatures breaking the bulbs into small fragments at a predetermined release tem- perature. The bone shape design of Sprinkler bulbs combined with the special liquid are decisive factors for the outstanding thermal response perfor- mance and strength of the glass bulbs. Sprinkler Bulbs With their unique bone shape design rein- forced ends are used to absorb loads from the mounting supports and to introduce these axially into a shaft of reduced diameter thus avoiding unfavourable shearing and bending stresses in the glass. Furthermore the out- standing tension condition allows a low mass structure, which, combined with the special filling liquid, provides very low Response Times. Response Time Index (RTI) The Response Time Index is a calculated figure describing the actual operating time of a glass bulb mounted in a sprinkler or other devices in given standard conditions. The RTI is an indication of the thermal sensitivity of the glass bulb. The lower the value of the RTI, the faster the response time of the bulb. sprinkler bulbs are able to meet any RTI requirements the user may have by combining diff erent actuating liquids with various bulb diameters. Standard Response Applications RTI>80 Special Response Applications 80>RTI>50 Fast, Super Fast and Ultra Fast-Response Applications RTI<50Features
Design Flexibility Its own drawn glass tubes. That offers huge flexibility for glass bulbs with different lengths, aspect ratios and strength / RTI specications towards customer‘s demand. Operating Temperatures The differnet colours of the fluid in the Sprinkler Bulbs signify differnet operating temperatures. The bulb colouring complies with all national and international standards for colour/temperature ratingsIntroduction to products
My company's main fire products are: sprinkler head, spray head, water curtain sprinkler head, foam sprinkler head, early suppression quick response sprinkler head, quick response sprinkler head, glass ball sprinkler head, hidden sprinkler head, fusible alloy sprinkler head, and so on. Support ODM/OEM customization, according to customer requirements.
