Update on standards for the evaluation of hand protection Teijin Aramid

Transcription

1 Update on standards for the evaluation of hand protection Teijin Aramid

2 Introduction Trend to engineered yarns and new technologies lead to significantly improved performance in cut protective gloves Existing standards are not designed for measuring and classifying the performance of highly cut resistant PPE/gloves Globally different standards and concepts are used for determination of performance ASTM F 1790 Standard test method for Measuring Cut Resistance of Materials Used in Protective Clothing ISO Protective Clothing Mechanical Properties Determination of resistance to cutting by sharp objects EN 388 Protective Gloves against Mechanical Risks Need for revision of standards to follow the trends of the protective glove market

3 ANSI/ISEA American National Standard for Hand Protection Classification Voluntary industry standard Classification and testing of hand protection for chemical and industrial application Performance levels for different properties based on standardized test methods (American Society for Testing and Materials and European Norm)

4 ANSI/ISEA Classification of: Mechanical protection Cut resistance Puncture resistance (hypodermic needle) Abrasion resistance Chemical protection Chemical permeation resistance Chemical degradation resistance Heat and Flame Protection Ignition resistance and burning behavior Heat degradation resistance Conductive heat resistance Vibration reduction Dexterity

5 ANSI/ISEA Mechanical Protection Cut protection ASTM F 1790 ASTM F2992

6 ANSI/ISEA Mechanical Protection ASTM F2992 Blade Force Force Specimen Sample holder Tomo Dynamo Meter 100 tester Load vs. distance concept Cut resistance defined as load (g)/ reference distance 20 mm Weight

7 ANSI/ISEA Mechanical Protection ANSI/ISEA Cut protection ANSI/ISEA LOAD (GRAMS) LEVEL LOAD (GRAMS) LEVEL < < A A A ``` A4 > A5 ASTM F A A A8 > 6000 A9 New classification levels

8 ANSI/ISEA Mechanical Protection Puncture resistance EN 388: 2003 Puncture resistance (other than hypodermic needles) New: ASTM F resistance against a 25G hypodermic needle

9 ANSI/ISEA 105 Mechanical Protection Puncture test ASTM F 2878 Puncture test EN 388 Hypodermic needle Performance level Performance level Probe N LEVEL N LEVEL < 2 0 < 10 0 > 2 1 > 10 1 > 4 2 > 20 2 > 6 3 > 60 3 > 8 4 > > 10 5 > 150 5

10 Revison EN 388: 2016 Protective gloves against mechancial risks

11 European regulations PPE in Europe needs to be marked according to the relevant standards e.g. EN 388 Testing needs to be done by an accredited testing facility EN standards are valid throughout the EU and are often globally recognized Used pictograms are for example EN388 ABCD EN407 ABCDEF EN

12 EN 388 Cut resistance testing Force 5 N Coupe Tester Blade is loaded with a constant force of 5 N and moved with a constant speed Cut resistance defined as lowest average cut index Blade Sample Holder

13 EN 388 Cut resistance testing with Coupe Tester New blade Used blades (after testing glass filament reinforced yarns) SEM pictures show the degradation of the blade of the Coupe Tester by a glass filament reinforced yarn. This degradation is impacting the cut test results. Therefore additionally the cut test according to ISO (TDM test) was introduced.

14 EN 388 vs. ISO 13997

15 EN classification of cut resistance EN 388: 2003 CUT INDEX LEVEL 1,2 1 2, EN 388: CUT INDEX LEVEL 1,2 1 2, N LEVEL > 13 N 4 > 23 N 5 ISO only recommended for highly cut resistant materials N LEVEL 2 A 5 B 10 C 15 D 22 E 30 F ISO as alternative or additional test method

16 Revision EN 388: Protective gloves against mechancial risks The new standard is introducing as additional protection impact resistance Testing and classification according to EN 13594:2015(Protective gloves for motorcycle riders Requirements and test methods) IMPACT RESISTANCE PROTECTION LEVEL 1 PROTECTION LEVEL 2 Single result 9,0 kn 5,0 kn Average force 7,0 kn 4,0 kn According to EN 388:2016 the gloves have to fulfill the requirements of protection level 1

17 Revision EN 388: changes of pictogram 2443E EN E

18 Revision EN 388: changes of pictogram LEVEL LEVEL 2342 EN 388:2003 Abrasion 2 Cut (Coupe test) 3 Tear 4 Puncture X EN 388:2016 Abrasion 2 Cut (Coupe test) 3 Tear 4 Puncture 2 Cut (TDM) X Impact resistance * Additional protection

19 Revision EN 388: changes of pictogram LEVEL LEVEL 3443 EN 388:2003 Abrasion 3 Cut (Coupe test 4 Tear 4 Puncture EP EN 388:2016 Abrasion 3 Cut (Coupe test 4 Tear 4 Puncture 3 Cut (TDM) E Impact resistance P * Additional protection

20 Teijin Aramid solutions for cut protection

21 More comfort combined with maximum protection Typical yarn cross section Teijin promotes a finer 1.5 denier Twaron fiber for use in protective gloves compared to 2.25 denier fiber commonly used in the market. A coarse fiber of 2.25 denier is stiffer compared to Twaron 1.5 denier fiber. To compensate for this, 2.25 denier para-aramid yarns are often spun having less twist which could result in a weaker yarn. The finer staple fiber in combination with a higher twist produces a tighter yarn bundle. The benefit for the end user is a longer lasting, more comfortable product with maximum protective properties.

22 Maximum color retention, minimal UV degradation Effect of exposure to UV light (Xenontester) for 48 hours constant exposure before exposure before exposure Due to its patented manufacturing process Twaron is showing less change of color after UV exposure. This visual perception builds confidence of inherent quality and performance characteristics. after exposure after exposure common para-aramid TWARON

23 Thermal characteristics of Twaron Does not burn Does not melt or drip Decomposing starts at 450 C/ 842 F Has low heat shrinkage Retains dimensional stability at high temperatures Release little smoke under extreme conditions

24 Comparative study cut resistance Comparative study by ASTM (ASTM F ) medium-heavy weight gloves 450 g/m ²

25 Characteristics of most common glove materials PRODUCT HEAT RESISTANCE CUT RESISTANCE ABRASION RESISTANCE Cotton Leather Nylon (Polyamide) Polyethylene (UHMW-PE) Polyester Twaron (para-aramid) If a combination of heat, cut and abrasion resistance is required, para-aramid such as Twaron is the choice material

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