UL fire rating

Glass Eibre Reinforced Plastic Glass Mat Thermoplastic UL fire rating High Density PolyEthylene Heat Deflection Temperature... 

Onshore 2 inches of Concrete UL 1709, 2 hour rating Offshore Ablative or intumensent materials, UL 1709, 2 hour rating Cable Trays Stainless steel cabinets or fire rated mats, UL 1709, 20 minute rating ESD Control Panels. Stainless steel cabinets or fire rated mats, UL 1709, 20 min. rating EIVs. (If directly exposed) -Stainless steel cabinets or fire rated mats UL 1709, 60 min. EIV actuators Stainless steel cabinets or fire rated mats UL 1709, 20 minute rating Firewalls ... 

The electrical electronics market dictates some specific regulations. Among them a typical example is the UL (Underwriters Laboratories) requirements related to the long-term service temperature and the fire rating. 

Fire resistant insulating material can provide passive protection for both vertical and horizontal structural steel members. The level or rating of fire resistance should be consistent to the expected fire duration. Where only fire resistant insulating material will be used, the material and its installation system should be specified to have a 2- to 3-hour fire rating (UL 1709). In applications using a combination of fixed water spray or sprinkler protection and fire resistant insulation, a 1- to 2-hour fire rating (UL 1709) is frequently specified for the fireproofing. 

The insulation properties of many fire-rated ASTs marketed today are typically provided by concrete i.e., tlie primary steel tank is surrounded by concrete. Due to the weight of concrete, this design is normally limited to small tanks. Another popular AST technology meeting all applicable code requirements for insulated tanks and fabricated to UL 2085 is a tank that utilizes a lightweight monolithic thermal insulation in between two walls of steel to minimize heat transfer from the outer tank to the inner tank and to make tank handling more palatable. 

Under NFPA 30A, dispensers may be installed directly over vaults or upon fire-resistant tanks at fleet-type installations, whereas a 7.6- to 15.2-m (25- to 50-ft) separation distance is required at retail-type service station installations. The IFC only allows gasoline and diesel to be dispensed from ASTs, designed with a 2-h fire rating. Non-2-h firerated UL 142 tanks dispensing diesel can be installed upon approval of the local authority. 

Morgan, A. and Bundy, M., Cone calorimeter analysis of UL 94V-rated plastics. Fire and Materials 2007, 31, 257-283. 

This has obvious disadvantages. The water removed in this way would, if kept, have helped to reduce flammability as well as increase the specific surface area, thus increasing the hygroscopic character and the oil absorption, and it would also have moderated the adverse effect on polymer viscosity. The practical significance is that ATH can be used in environmentally-friendly, halogen-free printed circuit boards, achieving a UL-94 V-0 fire rating. 

The situation is different for LOI criteria Al(OH)j and Mg(OH)2 are the most effective and talc and kaolin (which only act as a diluent) still show a very little effect. Increased fillers concentration improves fire retardance but also impairs physico-mechanical properties. Therefore there is interest in the minimum loading conferring the minimum fire-retardance level acceptable for a general-purpose application (such as LOI 25 UL 94 V-0). Melamine improves UL 94 rating of PP compared with the mineral filler alone. 

Onshore 2in. of concrete UL 1709, 2h rating Offshore Ablative or intumescent materials UL 1709, 2h rating Cable Trays Stainless steel cabinets or fire rated mats UL 1709,20min rating... 

BSD Control Panels Stainless steel cabinets or fire rated mats UL 1709, 20min. rating... 

Fire and Wind Hazards. Weather resistance of roof covetings is not necessarily correlated to fire and wiad resistance. Underwriters Laboratory and the Factory Mutual System test and rate fire and wiad hazard resistance, and some durabiUty tests. Organic felt or fiber glass mat base shingles are commonly manufactured to meet minimum UL requirements, which, ia addition to minimum mass, require wiad and fire resistance properties. 

Metal deck assembhes are tested by UL for under-deck fire hazard by usiag their steiaer tunnel (ASTM E84). The assembly, exposed to an under-deck gas flame, must not allow rapid propagation of the fire down the length of the tuimel. FM uses a calorimeter fire-test chamber to evaluate the hazard of an under-deck fire. The deck is exposed to a gas flame and the rate of heat release is measured and correlated to the rate of flame propagation. A different FM test assesses the damage to roof iasulations exposed to radiant heat. 

In the absence of fire retardants the material has a limiting oxygen index of 27.5 and may bum slowly. Only some grades will achieve a UL 94 V-1 rating. The Underwriters Laboratories continuous use temperature index is also somewhat low and similar to the polyarylates with ratings of 135-140°C (electrical) and 105°C (mechanical with impact). Initial marketing has emphasised comparisons with the aliphatic nylons for the reasons given in the previous... 

Polyetheretherketone PEEK is a high-temperature, crystalline engineering TP used for high performance applications such as wire and cable for aerospace applications, military hardware, oil wells and nuclear plants. It holds up well under continuous 450°F (323° C) temperatures with up to 600°F (316° C) limited use. Fire resistance rating is UL 94 V-0 it resists abrasion and long-term mechanical loads. 

Another example of the combination of toughening and fire retardant-enhancement is the use of TPE as a carrier for master batch of FR-803 (TBS). This master batch was not only an efficient toughener for SMA but also permitted a UL-94 VO rating, unachievable for SMA/TBS alone (Fig. 6). 

Sometimes the designer or architect goes overboard on extras. In one laboratory where the fire hazard was low, the operator had asked for doors with small windows between rooms. Instead, solid UL-rated doors were installed, even though they were not required by local building codes. Worse yet, the doors were selfclosing, a feature neither required nor desirable in this situation. 

Another aspect of the burning of PBT blends is dripping. When a thermoplastic part is burned, it will begin to melt as it bums. In some cases, the plastic resin will drip away from the sample. If these drips are burning, it can lead to a spread of the fire. The UL-94 test takes this into consideration and, depending on rating, requires little or no flaming drips. 

Due to the chlorine content, the fire resistance is inherently better than for hydrocarbon polymers and PVC but high amounts of chlorine are released during combustion. Oxygen indices are about 50 with UL rating VO or 5 VA. 

Structural steel shall be protected with a 3-hour rated fire resistive system per UL 1709. 

---