Monthly Archives: May 2013

What is UL 94 V0 plastic materials and how to verify it?

Q1: What is UL 94?

A1: UL 94 is a plastics flammability standard released by Underwriters Laboratories (UL) of the USA

The standard classifies plastics according to how they burn in various orientations and thicknesses. From lowest (least flame-retardant) to highest (most flame-retardant), the classifications are:

HB: Slow burning on a horizontal specimen; burning rate < 76 mm/min for thickness

V2: Burning stops within 30 seconds on a vertical specimen; drips of flaming particles are allowed.

V1: Burning stops within 30 seconds on a vertical specimen; no drips allowed.

V0: Burning stops within 10 seconds on a vertical specimen; no drips allowed.

5VB: Burning stops within 60 seconds on a vertical specimen; no drips allowed; plaque specimens may develop a hole.

5VA: Burning stops within 60 seconds on a vertical specimen; no drips allowed; plaque specimens may not develop a hole.

Tests are generally conducted on a 5″ x 1/2″ specimen of the minimum approved thickness. For 5VA and 5VB ratings, tests are performed on both bar and plaque specimens, and the flame ignition source is approximately five times as severe as that used for testing the other materials.

Q2: What is V0 flammability standard?

A2: If the plastic specimens reach V0 standard, they must:

Specimens must not burn with flaming combustion for more than 10 seconds after either test flame application.

Total flaming combustion time must not exceed 50 seconds for each set of 5 specimens.

Specimens must not burn with flaming or glowing combustion up to the specimen holding clamp.

Specimens must not drip flaming particles that ignite the cotton.

No specimen can have glowing combustion remain for longer than 30 seconds after removal of the test flame.

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What Is a Dewalt XRP Battery?

DeWalt XRP is a line of cordless ability resources that use high-capacity Dewlt Li-ion Battery. The DeWalt XRP line consists of cordless drill/drivers and cordless hammer drill. The XRP line was absolutely redesigned from its predecessors, for improved effectiveness, for a longer time run time involving costs and more time cordless power device battery everyday living. Most of the XRP batteries are backwards suitable with prior DeWalt drill batteries.

Batteries use while in the Dewalt XRP line:

The center of the DeWalt XRP line is really a new nano-phosphate components lithium-ion batteries. DeWalt statements that these new batteries have enhanced longevity could be re-charged nearly 2000 situations about the everyday living on the battery. The road incorporates 18-volt, fourteen.4-volt and 12-volt types.


Drill Transmission</br>
Every single product in the DeWalt XRP cordless drill provides a three-speed transmission (in which most other drills have a two-speed transmission). This more equipment lets the drilling motion to adapted properly for the endeavor at hand. Very first gear is for wood drilling with hole saws, second equipment for auger bits and 3rd gear for hammer drilling into concrete.


Drill Motor and Chuck</br>
The DeWalt XRP line of drills incorporates enhancements to your drill motors and chucks. The high-efficiency, frameless motors are built to have thirty % far more operate time, and so are linked to some self-tightening chuck that can help maintain the bits from slipping.


Durability

The DeWalt XRP line is intended with all steel gears and also a metallic gear scenario, that don’t just offers the drill greater longevity than former products, but it enables the drill to get increased dissipation of warmth. The drill motor brushes also are conveniently accessible for swift substitute.


Ergonomics

The DeWalt XRP line is built to ensure the drill has greater balance, in addition to a cushioned ergonomic grip to assist cut down operator exhaustion. Every single XRP drill also incorporates an LED get the job done gentle to illuminate the function surface area.

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