Impregnated Paper Research Articles

Production of Ag nanowires with high yield and narrow size distribution by promoting nucleation through hot injection and their application to disposable paper electrodes

The polyol method has been the most commonly used technique for fabricating silver nanowires (Ag NWs), wherein additive reagents facilitate precise control over their morphology. In this work, we introduced a straightforward approach to synthesize Ag NWs with minimal impurities and uniform diameter by using hot injection method. The underlying mechanism and final product are evaluated, and the scalable process was optimized to achieve a high yield (∼87.8 %). It was found that the hot injection of a Ag precursor at 170 °C significantly accelerated the reduction of Ag ions. The issue of the uniformity of Ag NWs was addressed by adding an organic halide to control the nucleation rate of Ag. The resulting Ag NWs solution was used to impregnated cellulose paper, forming an enhanced electrical network compared to other substrates. Given the low commercial cost of paper, this approach holds significant potential for widespread use in disposable electrodes. Furthermore, after subjecting the fabricated paper electrodes to various forms of damage, the connected LED bulbs consistently maintained their brightness. This demonstrates the network stability and suitability of these electrodes for flexible applications.

Insulation Degradation of Epoxy Resin Impregnated Paper Bushing Under Discharge Arc Ablation

Insulation Degradation of Epoxy Resin Impregnated Paper Bushing Under Discharge Arc Ablation

The influence of small molecule products on natural ester impregnated cellulose insulation paper under electric-thermal coupling field

Transformer oil-paper insulation materials are vulnerable to insulation failure due to the influence of voltage, high temperature, and other complex conditions. Additionally, during the operation of the transformer, the generation of harmful substances such as small molecule acids and water becomes a significant concern. In this study, we employed molecular simulation technology to investigate the effect of small molecule products on natural ester-impregnated cellulose insulation paper under electric-thermal coupling field. The results show that: under the action of electric-thermal coupling, the introduction of the electric field can weaken the molecular thermal motion to a certain extent, and the higher the temperature, the more pronounced the weakening effect of the electric field. When subjected to an electric-thermal coupling field, the mean square displacement of the cellulose molecular chains inside the models doped with water and formic acid increases compared to the oil-paper composite model, with an increase of 60.13 % and 98.25 %, respectively, at 700 K. The fraction of free volume in the model increases and the cohesive energy density decreases, the diffusion ability of molecules inside the model remains strong. The weakening effect of the electric field does not diminish the hydrolysis reaction between the small molecular products and the cellulose molecular chains. This leads to a decrease in model stability and ultimately to the breakdown of the insulation paper.

Surface property enhancement of impregnated paper decorative panel by MUF-polyelectrolyte complex@Nano-Al2O3 blending

The surface properties of melamine-urea-formaldehyde (MUF) impregnated paper decorative panels are unsatisfactory, characterized by brittle surfaces, poor abrasion resistance, and limited flame retardancy. A modification was introduced to the MUF resin by incorporating a blend of polyelectrolyte complex polyethyleneimine (PEI)-phytic acid (PA) and Nano-Al2O3 with the aim of enhancing the surface properties of the decorative panel. The modified resin underwent characterization, and subsequent analyses were conducted to investigate the properties of both the modified impregnated paper and the decorative panel. The results showed that the thermal stability of the modified resin was improved with a curing temperature of 124 °C. In comparison to the control, the modified impregnated paper showed an increase of 146.0 % in tensile strength and 154.5 % in elongation at break. The improved toughness of the modified MUF-impregnated paper resulted in a notable upsurge in both surface bond strength and cracking resistance of the decorative panel. The combustion test results indicated that the modified impregnated had a LOI value of 40.0 % and self-extinguishing behavior. In addition, due to the inclusion of Nano-Al2O3, the decorative panel exhibited a low abrasion value of only 14.1 mg/100r. Overall, the technology proposed in this study can improve the surface properties of decorative panels, increase their added value, and provide a new strategy for modifying MUF resin in the impregnated paper-decorated wood-based panels industry and for researchers.

Analysis of drug-impregnated paper samples seized in English prisons between 2018 and 2020

Novel psychoactive substances (NPS) in the form of impregnated papers delivered to prisoners are of particular concern in prison settings, where they are commonly used by vaping. The purpose of this study was to create a qualitative method for identifying the various emerging NPS impregnated onto paper samples sent to prisoners. It helps to demonstrate that these findings can be used to predict drug prevalence and trends in prisons. Between 2018 and 2020, 1250 non-judicial paper samples seized from 12 English prisons were analysed to determine the NPSs being circulated. Approximately 1 cm2 paper were cut and added to 50 % (v/v) methanol in LCMS-grade water. Vortex-mixing was used to prepare extracts (30 min). Q-TOF LC/MS was used to screen the extracts. This study showed that synthetic cannabinoid receptor agonist (SCRA) was the most common drug group detected in impregnated paper seizures in English prisons between 2018 and 2020, followed by cocaine, heroin type drugs (A) and amphetamine, ketamine type drugs (B). Male prisons had a higher prevalence of SCRAs, whereas female prisons had a higher prevalence of A drugs. Furthermore, lower security prisons were found to have a higher prevalence of B drugs, pregabalin, gabapentin type drugs (C), and abused and prescription drugs than higher security prisons which unveiled a higher prevalence of nicotine. The findings of this study have revealed new information about drug use in prisons. This study will also aid in the identification of drug smuggling routes into jails, keeping prison staff up to date with the trends.

Improving Surface Quality of Resin Impregnated Paper Used for Laminated Flooring Overlaid

This study aimed to improve the quality properties of impregnated papers used as a coating material in wood-based composites, especially for high-density fiberboard (HDF) floorings, using the Taguchi method and parameter design. Three factors were evaluated in determining the interactions as they are considered the most important in affecting the product quality characteristics such as particle size of Al2O3, surface modification agent and melamine raw material. Experiments were conducted in three replications using the L18 (21 × 32) orthogonal array. Color and gloss measurements were evaluated together with the sensory analysis method, which takes into account the number of the spots in the sample as quality characteristics. The best values obtained as a result of statistical analysis were A2 for the melamine raw material, 30 to 60 μm for the particle size and N-methyl-3-(trimethoxysilyl) propylamine for the surface modifier agent. Whether the experimental factors have a meaningful effect on the quality characteristics was also tested separately by analysis of variance. Only 58 % of the effect of the evaluated factors on the outcome could be expressed with the linear model (R2adj = 0.5785).

Preparation of a Novel Formaldehyde-Free Impregnated Decorative Paper Containing MnO2 Nanoparticles for Highly Efficient Formaldehyde Removal.

The loading of catalytic manganese dioxide (MnO2) nanoparticles onto an impregnated decorative paper has been an effective method for the removal of indoor formaldehyde (HCHO) pollutants. However, its preparation can present numerous challenges, including instability in dipping emulsions and leaching. In this investigation, a novel and stable formaldehyde-free polyacrylate dipping emulsion containing MnO2 particles was prepared and then back-coated on a decorative paper. To improve the dispersion and fixation, the MnO2 was modified with silane. HCHO can undergo physical adsorption on the cellulosic fibers present in the paper, while it can also undergo chemical degradation into CO2 within the MnO2 groups. The silane not only enhanced the interfacial adhesion to a polyacrylate resin but also increased the interlayer distance, thereby creating a larger space for HCHO absorption. The impregnated decorative paper back-coated with 10 wt % of silane-modified MnO2 exhibited a removal efficiency of approximately 90% for HCHO at 20 °C. The removal rate further improved to approximately 100% when the temperature was increased to 60 °C. Moreover, it is worth noting that the release of volatile organic compounds was exceptionally minimal. Additionally, the particleboard bonded with this impregnated decorative paper exhibited an extremely low emission of HCHO, with a value that approached 0 mg·L-1. Furthermore, the bonding strength of the surface remained unaffected. Therefore, this study provides a simple and eco-friendly method for effectively removing HCHO, which can enhance indoor air quality.

Evaluation of factors related to taste function in type 2 diabetics

Aim: The sense is an important driver of diet choice, which can lead to the development of chronic diseases such as diabetes. Although factors affecting differences in taste function between individuals have been evaluated in healthy individuals, there are limited studies investigating them in patients with type 2 diabetes. The aim of the present study was to analyse the factors affecting taste function in individuals with type 2 diabetes. 
 Material and Method: Sixty-one participants with a history of type 2 diabetes lasting at least one year and aged 19 to 75 years were enrolled. The taste function was tested using impregnated filter paper strips. 
 Results: The mean taste strip scores of the participants for sweet, salty, bitter, sour, and overall were 2.38±0.88, 1.91±0.92, 2.28±0.76, 2.18±1.01, 8.7±1.81, respectively. Age was significantly associated with the taste score for salty (r= -0.225 p= 0.041) and sour (r= -0.252 p= 0.040). It was determined that there was no effect of other confounders (gender, body mass index, fasting plasma glucose, glycosylated hemoglobin and duration of diabetes), except age, on the overall taste score in participants.
 Conclusion: Future studies with a larger number of patients may help better investigate the factors affecting taste function in type 2 diabetics.

Research progress and prospect of insulation characteristics of HVDC converter transformer bushing

The paper mainly analyzes the development of the high voltage bushing is closely related to the development of power industry. With the gradual rise of the voltage level in power industry, bushing has experienced the development process from low voltage, high voltage, ultra-high voltage to ultra-high voltage. In order to meet operation requirements under the different voltage levels, the pure porcelain bushing, metal shielded bushing and capacitive bushing have also appeared in the bushing body structure, and the core material has gradually changed from the oil impregnated paper and the adhesive paper to adhesive impregnated paper. In the process of the continuous development of bushing structure and main insulation materials, the research on the high-voltage bushing mainly focuses on the material performance test of bushing, the improvement of the main insulation structure design method, and the simulation analysis of bushing voltage and heat sharing.

Crack-resistant melamine/formaldehyde-impregnated paper-decorated panels using blocked isocyanates as a temperature-responsive crosslinker

Melamine–formaldehyde (MF) resin-impregnated paper-decorated panels are prone to surface cracking, which can be reduced by changing the brittle structure of the MF resin. To increase the curing degree and toughness of the resin, a hexamethylene diisocyanate trimer blocked with methyl ethyl ketoxime (ME-HDI-tri) was used as a temperature-responsive crosslinker. This latent crosslinking agent only worked above 120 °C, which prevented it from participating in cross-linking reactions during the preparation of the impregnated paper. The chemical structures of the modified MF resins (ME-HDI-tri-MF) were characterized by Fourier-transform infrared (FTIR) spectroscopy. The curing behaviors of the MF resins were characterized by thermogravimetric analysis (TGA), differential scanning calorimetry (DSC), and dynamic mechanical thermal analysis (DMTA). Impregnated paper was prepared with ME-HDI-tri-MF, and its tensile strength and elongation at break were tested. Blockboard was prepared with ME-HDI-tri-MF, and its cracking and corrosion resistance were tested. The absorption peak of the methylene chain was observed in the FTIR spectrum of ME-HDI-tri-MF after curing, which indicated that ME-HDI-tri participated in the curing reaction of the MF resin. With the addition of ME-HDI-tri 5 %, the curing temperature of the MF resin decreased from 142 °C to 130 °C, and the ultimate tensile stress and elongation at break of the modified impregnated paper increased by 97.70 % and 86.25 %, respectively. The cracking and corrosion resistance of the decorated panel prepared with ME-HDI-tri-MF were also improved. After adding 3 % ME-HDI-tri, the surface cracking of the decorated panels was prevented, which extended the service life and broadened the application range of the decorated panels.

Analisis Status Resistensi Aedes aegypti terhadap Insektisida Cypermethrin 0,05% di Kecamatan Endemis Kabupaten Malang

Aedes aegypti mosquitoes was the primary vector for carrying dengue fever. Dengue vector control has been widely carried out to reduce the number of dengue cases in Indonesia, but resistance cases have occurred in several areas, so it was necessary to know the status of resistance to determine appropriate efforts to control the vector. The purpose of this study was to determine the resistance status of Aedes aegypti in Malang Regency to 0.05% Cypermethrin. This type of research was descriptive observational research. The research method used was the susceptibility method with WHO standards using impregnated paper with the insecticide 0.05% Cypermethrin. Aedes aegypti mosquitoes were obtained from ovitrap results in the form of eggs and larvae taken from rearing at the Chemical Laboratory of the University of Muhammadiyah Malang. The number of mosquitoes used was 400 mosquitoes of the Aedes aegypti species aged 3-5 days. Mosquitoes were contacted with impregnated paper 0.05% Cypermethrin for one hour and held for 24 hours. Based on WHO standards, the criteria for susceptibility were determined as follows: said to be vulnerable if mortality was >98%, said to be tolerant if mortality was between 80-98%, and said to be resistant if mortality was <80%. The results showed that Aedes aegypti in Malang Regency was tolerant to 0.05% Cypermethrin with death rate each district; Turen 90%, Kepanjen 90%, Karangploso 96%, and Dau 100%, with percentage of 94%. This research showed that Cypermethrin with a concentration of 0.05% was still effective in reducing the development of Aedes aegypti, but the rotation of use must still be considered to reduce the number of dengue cases.

Space Charge Dynamics in Epoxy Resins Under the Influence of a Long-Term High Electric Field at Various Temperatures.

As the main insulating material of an ultra-high voltage (UHV) resin impregnated paper (RIP) bushing, epoxy resin accumulates space charge under the DC voltage, which would affect the insulation properties of the bushing. In this article, the evolution of space charge accumulation and dissipation within the epoxy resin samples was measured under the influence of a long-term (24 h) electric field of 60 kV/mm at 40°, 60°, 80°, and 100°C. The experimental results show that the space charge transport in the epoxy sample was a long-time dynamic process. When the temperature was not greater than 60°C, only homocharge accumulation was observed within the samples, and the space charge distribution did not reach a stable state even after 24 h of voltage application. When the temperature was not lower than 80°C, the positive heterocharge accumulation was observed at the interface between cathode and epoxy. Through analysis by fitting and numerical simulation, it was verified that the positive heterocharge accumulation was caused by the limitation of the hole extraction, and the transport of holes within the samples obeyed the jump conductance model.

Variation behavior of organic compounds in melamine-urea-formaldehyde impregnated bond paper in different pyrolysis stages

Melamine-urea-formaldehyde impregnated bond paper (MUF) is widely used as panel coating and decorative raw paper. Inappropriate treatment of MUF may lead to environmental pollution. In this study, routine MUF and MUF treated with additional titanium (MUF-T) were subjected to fast pyrolysis, and the product properties at different temperatures were investigated. The pyrolysis temperature was selected considering the reaction stages determined by Gaussian curve-fitting on thermogravimetric analysis curves. It was found that the presence of additional titanium changed the decomposition order of the organic components at 220 °C. Urea-formaldehyde in MUF could be decomposed at 220 °C, which had little effect on other components (melamine and cellulose). However, in terms of MUF-T, the decomposition temperature of urea-formaldehyde was postponed to 244 °C, which means that the pyrolysis strategy needs to choose a temperature higher than 244 °C. The volatiles in MUF-T are more easily converted to bio-gas or bio-oil than those in MUF. However, only CH4 was observed in the bio-gas generated of MUF-T at 220 °C, indicating that titanium did not catalyze the fracture of oxygen-containing functional groups at low temperatures. Titanium condensed at 550 °C, and the utilization of bio-char may face a problem of titanium particle shedding.

Isolation of Lactobacillus spp. in African Catfish Clarias gariepinus as probable probiotics in aquaculture

This research sought to isolate probiotic bacteria from cultured African Catfish Clarias gariepinus to be used against bacterial fish pathogens. Lactobacillus spp. were successfully isolated from the intestine of C. gariepinus, identified using biochemical characters. Pathogenic bacteria were also isolated from the same species such as Escherichia coli, Vibrio parahaemolyticus and Aeromonas hydrophila. The isolated Lactobacillus spp. was assessed in vitro for its antagonistic activity against isolated bacterial pathogens using disc diffusion method. Two impregnated paper discs of Lactobacillus spp., one antibiotic (Amoxicillin), and one blank disc were placed in each plate of cultured pathogenic bacteria. Results showed that Lactobacillus spp. is comparable to the antibiotic (Amoxicillin) on their antagonistic activity, quantified by measuring the zone of inhibition against E. coli, V. parahaemolyticus and A. hydrophila. The highest zone of inhibition of Lactobacillus spp. was shown against A. hydrophilla (8.5 mm) and lowest zone (7.25 mm) against E. coli. Antagonistic activity of antibiotic (Amoxicillin) showed highest zone of inhibition against E. coli 14 mm and the lowest was V. parahaemolyticus 7 mm. Based on the results of the study, Lactobacillus spp. was successfully isolated from the intestine of catfish. The present work highlights the isolated candidate can be a promising probiotic to be used in aquaculture feeding, because of its high potential activity against aquatic pathogenic bacteria in vitro.

Temperature Segment Compensation Method of Dissipation Factor for Insulation Diagnosis in Converter Transformer Bushing

Temperature compensation occupies a significant function in the insulation condition evaluation of converter transformer bushings based on the Frequency Domain Spectroscopy (FDS), which could influence the accuracy of its insulation diagnosis. In order to accurately obtain the variation law of FDS at different temperature, a Resin Impregnated Paper (RIP) insulation bushing for converter transformer was designed by the equivalence of maximum electric field, coaxial cylinder structure and RIP materials. The increment law of dielectric parameters both dissipation factor and capacitance at wideband frequency (1mHz ~ 10kHz) was measured for a quality RIP insulation samples at the temperature from 30°C to 100°C. 1) Under the uniform temperature, it was found that the value of dissipation factor was rising with the frequency from 10 Hz to 0.001Hz, while the tendency was reversed at the frequency from 100Hz to10kHz. 2) The minimum value of tan <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$\delta $ </tex-math></inline-formula> from 0.001Hz to 10kHz could be driven to higher frequency moving (10Hz to 10kHz) by the action of temperature rising 30°C to 100°C.3) The effect of temperature on the lower frequency 0.001Hz ~ 1Hz tan <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$\delta $ </tex-math></inline-formula> of RIP insulation closely conformed to the index law of Arrhenius equation, while it was in accordance with the linear decrease at higher frequency 1kHz ~ 10kHz. The effect of temperature on dissipation factor could be eliminated by curve segment shifting based the experiment equation, which it at 0.001Hz dissipation factor could be eliminated by curve shifting based the index equation originated Arrhenius equation. The method is beneficial to eliminate the influence of temperature on the dielectric spectroscopy test results, and then to eliminate the influence of temperature on the dielectric spectroscopy diagnosis of RIP bushings.

The Penggunaan Insektisida Rumah Tangga dan Kerentanan Aedes sp terhadap Permetrin di Kelurahan Sorosutan Kota Yogyakarta

Abstract. The use of household insecticides is an alternative solution to prevent mosquito bites.Most of the household insecticides sold in Indonesia have pyrethroid active ingredients, permethrin,which is available in the aerosol formulation. Inappropriate use of household insecticides can reducemosquito susceptibility. The objectives of this study are to describe the use of household insecticidesand susceptibility of Aedes sp. against permethrin in Sorosutan Yogyakarta. This study used a crosssectionalsurvey design. This study was conducted in December 2018–April 2019 in 354 householdsin Sorosutan which were randomly selected based on proportional sampling. Interviews about thehousehold insecticides were conducted with the owner or resident of the house. The susceptibilitytests used impregnated paper with permethrin 0.75%. The survey results showed that 25.14% ofthe houses use household insecticides. The insecticide used were aerosol, electric mosquito repellents,and mosquito coils containing active ingredients of the pyrethroid group, namely dimefl uthrin,transfl uthrin, prallethrin, cypermethrin, and metofl uthrin. The susceptibility test results showed adecrease in mosquito susceptibility where the population of Aedes sp. in Sorosutan has been resistantagainst permethrin. The continuous use of insecticides with pyrethroid active ingredients can developmosquito resistance against permethrin because all pyrethroids have the same mode of action. Thisstudy concludes that only a small proportion (25,14%) of the households used insecticides with theactive ingredients used mainly in the pyrethroid group (dimefl uthrin, transfl uthrin, prallethrin,cypermethrin, and metofl uthrin) and the population of Aedes sp. in Sorosutan has been resistant topermethrin.

Simulation and Modelling of Transient Electric Fields in HVDC Insulation Systems Based on Polarization Current Measurements

Simulating and modelling electric field dynamics in the insulation of medium- and high-voltage DC electrical systems is needed to support insulation design optimization and to evaluate the impact of voltage transients on ageing mechanisms and insulation reliability. In order to perform accurate simulations, appropriate physical models must be adopted for the insulating material properties, particularly conductivity, which drives the electric field in a steady-state condition and contributes to determining the field behavior during voltage and load transients. In order to model insulation conductivity, polarization, and conduction, mechanisms must be inferred through charging and discharging current measurements, generally performed at different values of electric field and temperatures in flat specimens of the material under study. In general, both mechanisms are present, but one of them may be predominant with respect to the other depending on type of material. In this paper, we showed that models based on predominant polarization mechanisms were suitable to describe impregnated paper, but not polymers used for HV and MV DC insulation. In the latter case, indeed, trapping–detrapping and conduction phenomena were predominant compared to polarization, thus conductivity models had to be considered, in addition to or as a replacement of the polarization model, in order to carry out proper electric field simulations.

Electro-thermal Coupling Model for Radial Temperature and Electric Field Distribution Computation and Experimental Research of 550kV RIP AC Oil-gas Bushings

The condenser of 550kV RIP oil-gas bushings is in the solid structure of resin-epoxy impregnated paper(RIP), which has large difference with the oil-immersed one (OIP). Oil-gas bushings has compact configuration and heat conduction condition is harsh, while temperature distribution has direct relationship with bushings’ long-term stable operation performance, so it’s essential to carry out research in radial temperature within condenser during production of RIP oil-gas bushing prototype. In this paper, radial temperature distribution principle of bushing condenser under linear material conditions has been summarized by building electrothermal coupling theoretical model of bushing condenser. The model has been generalized by electro-thermal coupling finite element mode under nonlinear material conditions, and electrothermal coupling iterative computation process has also been proposed, then experimental measurement study in local temperature points of bushing condenser has been carried out. The study shows that plate model has advantages of high accuracy and simple form in calculating radial temperature distribution of bushing condenser; the hot-spot temperature of 550kV RIP oil-gas bushings is about 95°C which appears near the center conductor; radial temperature of bushings under nonlinear material conditions is lower than that under linear material conditions and the thermal breakdown voltage of condenser under rated current is 538kV which is higher than the maximum operation phase voltage. This paper provides theoretical foundation for radial temperature computation within RIP bushing condenser and has some reference value for the design of HVAC RIP bushings.

Susceptibility of Anopheles Mosquitoes to Deltamethrin and Bendiocarb Insecticides in Nasarawa Local Government Area, Nasarawa State Nigeria

Anopheles mosquito’s resistance to insecticides has been one of the major challenges in eradicating malaria. This study was carried out to determine the susceptibility status of Anopheles mosquitoes to Deltamethrin and Bendiocarb in some communities of Nasarawa Local Government Area of Nasarawa State for four months. The research was carried out at the insectary laboratory of Nasarawa State University Keffi. Center for Disease Control (CDC) bioassay bottle and WHO impregnated papers were used to test the susceptibility of Anopheles mosquitoes. The result shows that Anopheles mosquitoes exposed to Bendiocarb and Deltamethrin using CDC bioassay bottles were susceptible at 15mins, there was no mortality recorded from the control at 30 minutes of exposure. Anopheles mosquitoes exposed to WHO impregnated paper of Bendiocarb and Deltamethrin were susceptible at 60 minutes, mortality was recorded at 24h post exposure time from the control. χ2analysis of Bendiocarb and Deltamethrin insecticides exposed to CDC bioassay bottles was statistically insignificant p&gt;0.05, while χ2 analysis of Bendiocarb and Deltamethrin exposed to WHO impregnated papers was also insignificant p&gt;0.05. These results indicated susceptibility of Anopheles mosquitoes to Bendiocarb and Deltamethrin for the two methods of susceptibility test. The use of these synthetic insecticides in the control of malaria should be encouraged and made available.

Status Resistensi Nyamuk Aedes aegypti dari Wilayah Kerja Puskesmas Salido terhadap Malathion 5% dan Alfa-sipermethrin 0,025%

Background: Insecticides resistance status in Aedes aegypti population is one of the factors that influence the successful control efforts of dengue vector. Objectives:To determine the resistance status of Aedes aegypti from Salido Health Center towards malathion 5% and alpha-cypermethrine 0,025%. Methods: This was a descriptive study and collected during December 2019 – June 2020. Those samples were then observed with larval survey and from the ovitrap placed in 100 houses and then maintained in laboratory of parasitology, faculty of medicine Andalas University. To determine the resistance status of Aedes aegyptiusing the bioassay method with the susceptibility test by referring to the guidance of the Ministry of Health based on the 2016 WHO standard using impregnated paper malathion 5% and alpha-sipermethrin 0.025%. Observations were made by recording the number of mosquito deaths in the 15, 30, 45, 60 and 1440 minutes. The percentage of mosquito deaths is calculated after 24 hours of maintenance it is categorized as resistant if the mortality rate is less than 90%, supected to be resistant if the mortality is between 90-97%, and categorized as vunerable if the mortality rate is between 98-100%.Result: The mortality rate of Aedes aegypti for 24 hours by malathion 5% was 95%, the LT50 and the LT90 were 624 minutes and 1.247 minutes respectively. The percentage of mosquito deaths by alpha-sipermetrin 0,025% after 24 hours was 96,25% the LT50 and the LT90 were 526 minutes and 1.163 minutes respectively.Conclusion: that the resistance status of Aedes aegypti from Salido Health Center is resistant towards malathion 5% and alpha-cypermethrine 0,025%.