• Title, Summary, Keyword: halogen free

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Study on Halogen Free Low Smoke Polyolefin (할로겐이 없는 저연성 폴리올레핀에 관한 연구)

  • Kim, Young-Doo;Chung, Kwang-Soo;Kim, Tae-Ho
    • Elastomers and Composites
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    • v.37 no.3
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    • pp.177-182
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    • 2002
  • For low-smoke-type polyolefin compound, LDPE, EVA, and EEA as base resin, magnesium trihydrate, alumina trihydrate, and red phosphorous as flame retardant and MAH type compatibilizer were applied. The amount of each component was changed to find out optimum composition. Mechanical properties were obtained by tensile test and residual stress after aging and flame retardancy was evaluated by smoke density, LOI(Limit Oxygen Index), and UL-94 test. SEM was used for the investigation or morphology and halogen contents were obtained by measuring the amount of HCI. Two kinds of halogen free compositions for flame retardant and low smote resin were found and it is expected to be applied for various purposes.

Properties and Development of Halogen Free Flame Retardant Cable (Halogen Free 난연 케이블의 제특성 및 개발)

  • Choi, W.K.;Choi, W.;Seo, S.J.;Yang, H.J.;Won, J.H.
    • Proceedings of the KIEE Conference
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    • pp.768-770
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    • 1992
  • Conventional flame retardant cable using PVC or CR materials generate considerable amount of toxic and acidic gas (HCI etc.) together with excessive black smoke during a fire. The newly developed halogen free materials have dissolved the problem of halogen acid gases. This paer describes the development of this power cable insulation and sheath, using halogen free materals.

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Recent Pb-free Electronic Packaging Issues

  • Lee, Hyuck-Mo
    • Proceedings of the International Microelectronics And Packaging Society Conference
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    • pp.63-92
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    • 2001
  • ·EC's/Japanese environmental regulation drive the Pb-free/Halogen-free application ·Most Japanese electronics companies are preparing the green products. ·All items concerning to Pb-free/halogen-free technology should be coparallely designed and developed. ·More works need to clear the unknowns on Pb-free materials ·Need of consensus on materials and standards ·EBM (Environmental Benign Manufacturing)

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Review on the Lead-Free Solder Technology

  • Lee, Hyuck-Mo
    • Proceedings of the International Microelectronics And Packaging Society Conference
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    • pp.21-50
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    • 2001
  • EC's/Japanese environmental regulation drive the Pb-free/Halogen-free application. Most Japanese electronics companies are preparing the green products. All items concerning to Pb-free/Halogen-ree technology should be coparallely designed and developed. More works need to clear the unknowns on Pb-free materials. Need of consensus on materials and standards. EBM (Environmental Benign Manufacturing)

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A Study on Mechanical Properties Improvement of Halogen-free Flame Retardant Compounds by Nanoclay Addition (나노클레이 첨가에 따른 할로겐프리 난연컴파운드의 기계적 특성에 관한 연구)

  • Hwang, Chan-Yun;Yang, Jong-Seok;Sung, Baek-Yong;Kim, Ji-Yeon;Park, Dae-Hee
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.28 no.2
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    • pp.126-130
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    • 2015
  • In this study, some materials are organized and experimented with variables to obtain the optimum mix proportion for the mechanical property of halogen free flame resistance compound with varying addition of nano clay. Tensile strength, density and stiffness are tested in the room temperature. In this study, unlike existing layered structure, nano clay with tabular structure is used and sufficient stiffness, strength, thermal stability and gas block capability can be achieved with small amount of addition. Tensile strength and elongation test show high rupture strength only in specimens with compatibilizing agents while density test shows average measurement in all the specimens except T-9. It was confirmed that the measurement value according to the additives in compatibilizing agent or in nano clay of hardness test represents similarly.

Assessment of material analysis for Halogen free flame retardant concentric neutral type Power cable (난연성 동심중성선 전력 케이블의 재료에 대한 평가 기술)

  • Soh, Jin-Joong;Shim, Dae-Sub
    • Proceedings of the KIEE Conference
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    • pp.1460-1462
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    • 2002
  • The test methods on materials of electrical power cable are used in accordance with 25 specifications of IEC, ASTM, ICEA, KS and KEPCO Spec. The validation of test methods were checked and stablished by solving the problems occurred during the test. These tests are flammability, degree of acidity of gases, amount of halogen acid gas, smoke density, oxygen index, amount of ion in semiconductor, void, amber, contaminant and water tree, crosslinked density. Then the performance of power cable made by A, B, C and D company were evaluated and compared.

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Pb-free Status and Strategy of Semiconductor Business in Samsung Electronics

  • Jeong Se-Young
    • Proceedings of the International Microelectronics And Packaging Society Conference
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    • pp.79-92
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    • 2004
  • RoHS compliant products are now being mass-produced. Eco-product(Pb-free+RoHS compliant+Halogen-free) will be possible from 2005. Pb-free flip chip will be qualified by 2004. 4Q. Lead Finish: SnBi-Under mass production Pd PPF-Under small production Matte Sn-will be internally qualified by 2004. 4Q Development of Pb-free Solder Ball: Stable Supply, Cost Down.

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Dentin bond strength of bonding agents cured with Light Emitting Diode (LIGHT EMITTING DIODE로 광조사한 상아질 접착제의 상아질 전단접착강도와 중합률에 관한 연구)

  • Kim Sun-Young;Lee In-Bog;Cho Byeong-Hoon;Son Ho-Hyun;Kim Mi-Ja;Seok Chang-In;Um Chung-Moon
    • Restorative Dentistry and Endodontics
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    • v.29 no.6
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    • pp.504-514
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    • 2004
  • This study compared the dentin shear bond strengths of currently used dentin bonding agents that were irradiated with an LED (Elipar FreeLight, 3M-ESPE) and a halogen light (VIP, BISCO). The optical characteristics of two light curing units were evaluated. Extracted human third molars were prepared to expose the occlusal dentin and the bonding procedures were performed under the irradiation with each light curing unit. The dentin bonding agents used in this study were Scotchbond Multipurpose (3M ESPE), Single Bond (3M ESPE), One-Step (Bisco), Clearfil SE bond (Kuraray), and Adper Prompt (3M ESPE), The shear test was performed by employing the design of a chisel-on-iris supported with a Teflon wall. The fractured dentin surface was observed with SEM to determine the failure mode. The spectral appearance of the LED light curing unit was different from that of the halogen light curing unit in terms of maximum peak and distribution. The LED LCU (maximum peak in 465 nm) shows a narrower spectral distribution than the halogen LCU (maximum peak in 487 nm). With the exception of the Clearfil SE bond (P < 0.05), each 4 dentin bonding agents showed no significant difference between the halogen light-cured group and the LED light-cured group in the mean shear bond strength (P > 0.05). The results can be explained by the strong correlation between the absorption spectrum of camphoroquinone and the narrow emission spectrum of LED.

THE EFFECTS OF VARIOUS CURING LIGHT SOURCES ON THE MICROHARDNESS OF LIGHT-ACTIVATED RESTORATIVE MATERIALS (다양한 광원에 의한 광중합형 수복물질의 미세경도에 관한 연구)

  • Choi, Nam-Ki;Yang, Kyu-HO;Kim, Seon-Mi;Choi, Choong-Ho
    • THE JOURNAL OF THE KOREAN ACADEMY OF PEDTATRIC DENTISTRY
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    • v.32 no.4
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    • pp.634-643
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    • 2005
  • The aim of this study is to evaluate the effects of blue light emitting diode (LED) Light Curing Units (FreeLight 2, L.E.Demetron I, Ultra-Lume 5) on the microhardness of three resin composites (Z250, Point 4, Dyract AP) and to determine their optimal curing time. Samples were made using acrylic molds $(2.0mm{\times}3mm)$ of each composite. All samples were prepared over a Mylar strip placed on a flat glass surface. After composite placement on the molds, the top surface was covered with another Mylar strip and a glass slab was gently pressed over it. The times of irradiation were as follows: Elipar TriLight, 40 s; Elipar FreeLight 2. L.E.Demetron I, and Ultra-Lume 5, 10s, 20s, 40s, respectively. Mean hardness values were calculated at the top and bottom for each group. ANOVA and Sheffe's test were used to evaluate the statistical significance of the results. Results showed that FreeLight 2, Ultra-Lume 5, and L.E.Demetron I were able to polymerize point 4 in 20 seconds to a degree equal to that of the halogen control at 40 seconds. FreeLight 2 and L.E.Demetron I were able to polymerize Z250 in 10 seconds to a degree equal to that of the halogen control at 20 seconds. FreeLight 2 and L.E.Demetron I were able to polymerize Dyract AP in 10 seconds to a degree equal to that of the halogen control at 40 seconds. The commercially available LED curing lights used in this study showed an adequate microhardness with less than half of the exposure time of a halogen curing unit.

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A Study on Perpendicular Flame Retardant Characteristic Improvement of Halogen-free Flame Retardant Compounds by Nanoclay Addition (나노클레이 첨가에 따른 할로겐프리 난연컴파운드의 수직난연 특성 향상에 관한 연구)

  • Hwang, Chan-Yun;Yang, Jong-Seok;Seong, Baeg-Yong;Kim, Ji-Yeon;Park, Dae-Hee
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.28 no.1
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    • pp.51-56
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    • 2015
  • The object of this study is to obtain the optimum mix proportion of halogen free compound with flame resistance and, for the purpose, thermal/electrical characteristics test are conducted using compatibilizing agents, flame resistance agents, hydroxide aluminum, sunscreen, antioxidant and silicon oil on the base resin of linear low density polyethylene (LLDPE), Ethylene vinyl acetate copolymer (EVA). Existing compound method accompanies many requirements to be satisfied including a lot of addition of flame resistance agents, prohibition of impact on mixing capability with base and property and etc. In this study, different from the existing method, the optimum mix proportion is determined and experimented by adding nano clay. Oxygen index test shows no difference between specimens while T-6, T-9 shows oxygen index of 29[%] and 26[%], respectively. This is concluded that hydroxide aluminum, which is a flame resistance agent, leads low oxygen index. From UL94-V vertical flame resistance test, the combustion behavior is determined as V-0, Fail based on UL94-V decision criteria. Viscometry shows low measurements in specimens with separate addition of compatibilizing agents or nano clay. Volume resistivity test shows low measurement mainly in specimens without compatibilizing agents. Therefore, with the flame resistance compound shows better performance for thermal/electrical property and the optimum mix proportion are achieved among many existing materials.