2017年11月26日星期日

FR dictiondary Part 5:Flash Fire Terms

The last part of getting to know flame resistant clothing:FLASH FIRE TERMS

FLASH FIRE TERMS

TPP – Thermal Protective Performance of a fabric; the amount of heat it takes to pass through the fabric and cause a second-degree burn; CGSB 155.20 requires a fabric have a minimum of 6 cal/cm² when tested with a spacer

Manikin Test/Body Burn – A simulated flash fire test using an instrumented manikin to calculate the estimated percentage of second and third degree body burns after three seconds of exposure; NFPA 2112 requires the percentage to be below 50 percent

HTP – Heat Transfer Performance of a fabric; the amount of heat it takes to pass through a fabric to cause second-degree burns based on the skin burn curve; NFPA 2112 requires a fabric to have a minimum of 6 cal/cm² when tested with a spacer and 3 cal/cm² in contact

2017年11月23日星期四

FR dictiondary Part 4:Electrical Hazard Terms

The fourth part of getting to know flame resistant clothing : ELECTRICAL HAZARD TERMS
ELECTRICAL HAZARD TERMS
Arc Rating – Value describing a fabric’s performance under exposure to an electrical arc discharge based on testing that determines when the amount of exposure results in a 50-percent probability of causing the onset of second-degree skin burns; expressed in cal/cm² as either an ATPV or an EBT
ATPV – Arc Thermal Performance Value of a fabric shown in cal/cm²
EBT – Energy of Breakopen Threshold; the cal/cm² at which the fabric breaks open before it reaches its ATPV
HRC – Hazard Risk Category; a term used specifically in NFPA 70E; each specific task listed in the 70E table establishes one of five HRC category requirements for the protective clothing and PPE to be worn while performing that task, and each category outlines the minimum arc rating (cal/cm²) for the FR clothing and other PPE required

2017年11月22日星期三

FR dictiondary Part 3:Standards

The third part of getting to know flame resistant clothing:EU and American Standards

STANDARDS
EN ISO 11611 – Protective clothing for use in welding and allied processes
EN ISO 11612 – Protective clothing - Clothing to protect against heat and flame
EN ISO 14116 – Protective clothing - Protection against flame - Limited flame spread materials,material assemblies and clothing
Protective clothing against the thermal hazardsof an electric arc
EN61482-1-1:Test method:Open Arc Ranking,presented with a value. ATPV(Arc Thermal Performance Value)
EN61482-1-2:Test method:Box test.Divided in two classes,where Class 2 is the highest level.
EN1149-1: Protective clothing:Electrostatic properties(surface resistivity)
EN1149-3: Protective clothing:Electrostatic properties(charge decay)
EN1149-5: Protective clothing:Electrostatic properties - Part 5:Material performance and design requirements
EN 13034: Protective clothing against liquid chemicals. Performance requirements for chemical protective clothing offering limited protective performance against aqueous based chemicals only (Type 6 and Type PB[6] equipment)
EN20471: High visibility warning clothing for professional use
NFPA2112: Standard on Flame-Resistant Garments for Protection of Industrial Personnel Against Flash Fire

2017年11月21日星期二

FR dictiondary Part 2:Fabric Terms

The second part of getting to know flame resistant clothing:fabric terms.
FABRIC TERMS
Aramid – The chemical family of FR fibers like Nomex (meta-aramid) and Kevlar (para-aramid)
Nomex – The brand name for the meta-aramid produced by DuPont
Kevlar – The brand name for the para-aramid produced by DuPont
Modacrylic – A generic name for a type of inherently FR fiber (e.g., the fiber used in Protera and Tecasafe plus)
Lyocell – A cellulose fiber made from dissolving wood pulp (a type of rayon)
PBI – Short for the polymer Polybenzimidizole; an inherently FR fiber made by Celanese Inc.
FRC – Flame-resistant clothing

2017年11月20日星期一

FR dictiondary Part 1:General Terms

The first step in adequately protecting your workforce is understanding the hazards and standards that apply to your industry, as well as the products available to address them. Drotex’s helpful FR Dictionary covers the flame-resistant (FR) clothing terms and acronyms you’ll need to know in order to make informed decisions and protect your workforce.
There are five parts of the flame-resistant clothing:General Terms,Fabric Terms,FR Standards,Electrical Hazard Terms and Flash Fire Terms.
Today we'll introduce the first part:general terms.
GENERAL TERMS
Flame Resistant (FR) – A fabric or product that resists ignition and self extinguishes after removal of the ignition source
Flame Retardant – A chemical treatment applied to a flammable base fabric that gives it FR properties
Inherent – An FR fabric that is made of fibers that are flame resistant due to the chemical structure of the fibers and has not been chemically treated
Treated – An FR fabric in which flame-retardant chemicals are added to the fabric after it has been woven or knitted
Vertical Flame Test – A basic test that determines whether or not a fabric is FR by measuring how much of the fabric is consumed after 12 seconds of flame exposure
Char Length – A measurement of the damaged fabric after the Vertical Flame test

2017年11月16日星期四

what is the difference between fire retardant & flame resistant clothing?

Jobs that expose workers to fire dangers require the use of protective clothing, although the names used by manufacturers can be confusing. Learn what the terms mean and how the clothing can protect you to make sure you are safe at work. Parents, too, might find flame-resistant sleepwear for their children and need to understand the terms.
 
Definitions
 
Manufacturers describe protective clothing as "fire retardant" or "flame resistant," sometimes meaning the same thing. However, some companies draw a subtle distinction or interchange the words "fire" and "flame." Interior Mall, a vendor of protective clothing, defines "fire resistant" as material treated to keep fire from spreading and "flame-retardant" fabrics as being resistant to fire, while also stunting its spread. Safety testing firm Texco Instruments says flame-resistant clothing will not keep burning once the source of the fire is gone.
 
Functions
 
Whether fire retardant or flame resistant, protective clothing can save the wearer from serious injury or death. People working in electrical, fuel- or chemical-related fields or firefighting require this clothing, as do race car drivers and crews and military personnel, Texso Instruments notes. In addition, manufacturers of infant sleepwear also treat some fabrics to be flame resistant, according to government guidelines.
 
How it works
 
Flame-resistant clothing keeps fire contained and puts the flames out when the original source is gone, Automotive Workwear experts explain. Manufacturers bind a special finish to the fabric to create the flame-retardant property, according to the company's website. In a slight difference, companies make flame-retardant clothes using fibers that by themselves resist burning or by using a special finish, according to Interior Mall.
 
Shopping tips
 
Sorting through the different types of fire-protection clothing on the market can confuse shoppers. Texso Instruments recommends knowing first what dangers you will face while wearing the clothing and learning your industry's specific standards for that hazard. Then, choose the type of material that will protect against your job's specific dangers, including cotton-based or synthetic fabrics.Firefighters need protective clothing, as do workers in many other industries.
 
Warnings
 
Whether you choose fire-retardant or flame-resistant clothing, remember that no clothes are guaranteed not to burn. Many people believe that pure cotton will not burn, but that is a myth, Automotive Workwear's shopping guide warns. Washing protective clothing eventually will remove its flame protection, so follow manufacturers' direction closely, the company adds.

2017年11月14日星期二

What is aramid?

Aramid fibers are man-made high-performance fibers, with molecules that are characterized by relatively rigid polymer chains. These molecules are linked by strong hydrogen bonds that transfer mechanical stress very efficiently, making it possible to use chains of relatively low molecular weight.
The term “aramid” is short for “aromatic polyamide”. Aromatic polyamides were first applied commercially as meta-aramid fibers in the early 1960s, with para-aramid fibers being developed in the 1960s and 1970s.
Aramid fibers share some general characteristics that distinguish them from other synthetic fibers:
  • High strength
  • Good resistance to abrasion
  • Good resistance to organic solvents
  • Non-conductive
  • No melting point
  • Low flammability
  • Good fabric integrity at elevated temperatures
These unique characteristics derive from the combination of having stiff polymer molecules with a strong crystal orientation as well as close interaction between the polymer chains due to the hydrogen bonds.