Tag: Powder Coating Properties

 

Solution of Poor Mechanical Properties and Chemical Resistance

polyester coating degradation

1.Poor Mechanical Properties and Chemical Resistance Cause: Too high or Too low curing temperature or timeSolution: Confirm and check with powder coating powder supplierCause:Oil,grease,extrusion oils,dust on the surfaceSolution:Optimize pretreatmentCause:Differing materials and material colorsSolution:Insufficient pretreatmentCause:Incompatible pretreatment and powder coatingSolution:Adjust pretreatment method,consult powder supplier 2.Greasy Surface(Haze like film on the surface which can be wiped off) Cause: Blooming effect-white film on the powder surface,which can be wiped offSolution:Change powder coating formula,increase curing temperatureCause: Insufficient air circulation in the ovenSolution:Increase air circulationCause: Contamination onRead More …

Iron oxides Use in High-temperature-cured Coatings

Iron oxides

Standard yellow iron oxides are the ideal inorganic pigments to develop a wide range of color shades due to the advantages in performance and cost provided by their high hiding power and opacity, excellent weather, light and chemical fastness, and reduced price. But their use in high-temperature-cured coatings such as coil coating, powder coatings or stoving paints is limited. Why? When yellow iron oxides are submitted to high temperatures, their goethite structure (FeOOH) dehydrates and partially turns into hematite (Fe2O3),Read More …

Zinc casting can be powder coated

Zinc casting can be powder coated

zinc casting can be powder coated A cast part will have porosity that may cause blemishes in the coating at high temperature. Air that is trapped near the surface may expand and rupture the film during the cure process. There are several ways to mitigate the issue. You can preheat the part to drive off some of the trapped air that causes the problem. Heat the part to a temperature about 50°F greater than the cure temperature, cool it down,Read More …

Suitable temperature for Waterproof coating

Waterproof coating

Waterproof coating selection characteristics of the solution, nano-ceramic hollow particles, silica alumina fibers, all kinds of reflective material as the main raw material, thermal conductivity only 0.03W/mK, can effectively suppress shielded infrared heat radiation and heat conduction. In the hot summer, at a temperature of more than 40 ℃, it would be inappropriate to do waterproof, for the following reasons: queous or solvent-based waterproof coating construction under high temperature conditions will rapidly thickens, cause priming difficulties, affect the construction quality;Read More …

D523-08 Standard Test Method for Specular Gloss

D523-08

D523-08 Standard Test Method for Specular Gloss This standard is issued under the fixed designation D523; the number immediately following the designation indicates the year of original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval . A superscripl epsilon indicates an editorial change since the last revision or reapproval. This standard has been approved for use by agencies of the Department of Defense . 1.Scope OfRead More …

ASTM D3359-02-TEST METHOD A-X-CUT TAPE TEST

ASTM D3359-02-TEST METHOD A-X-CUT TAPE TEST

ASTM D3359-02-TEST METHOD A-X-CUT TAPE TEST 5. Apparatus and Materials 5.1 Cutting Tool—Sharp razor blade, scalpel, knife or other cutting devices. It is of particular importance that the cutting edges be in good condition. 5.2 Cutting Guide—Steel or other hard metal straightedge to ensure straight cuts. 5.3 Tape—25-mm (1.0-in.) wide semitransparent pressure sensitive tape7 with an adhesion strength agreed upon by the supplier and the user is needed. Because of the variability in adhesion strength from batch-to-batch and with time,Read More …

Powder coating orange peels appearance

Powder coating orange peels

Powder coating orange peels appearance From shape visually or using mechanical methods of measurement shows instrument or via a bellows scan to assess and compare the powder coating orange peel appearance. (1) visual method In this test, the model of the double tube fluorescent. A model of reflective light source can be obtained by appropriately placed boilerplate. Qualitative analysis of the clarity of the reflected light from the visual assessment of the nature of the flow and leveling. In theRead More …

Coating forming process

Coating forming process

Coating-forming process can be divided into melt coalescence to form a coating film leveling three stages. At a given temperature, the control molten coalescence rate the most important factor is the melting point of the resin, the viscosity of the molten state of the powder particles and the size of the powder particles. In order to best coalescence of molten shall as soon as possible, in order to have a longer time to complete the leveling phase flow effects. TheRead More …

7 Standards To Test Weathering Resistance of Powder Coatings

Weathering Resistance Powder Coatings for street lamps

There are 7 standards to test weathering resistance of powder coatings. Resistance to mortar Accelerated ageing and UV durability (QUV) Saltspraytest Kesternich-test Florida-test Humiditytest (tropical climate) Chemical Resistance Resistance to mortar According to the standard ASTM C207. A specific mortar will be brought in contact with powder coating during 24h at 23°C and 50% relative humidity. Accelerated ageing and UV durability (QUV) This test in the QUV-weatherometer consists of 2 cycles. The coated testpanels are 8h exposed to UV-light andRead More …

What Is The Film Hardness

film hardness

The hardness of the powder paint film refers to the resistance of the paint film after drying has a solid, i.e. the film surface the role another on the greater hardness of the material performance. This resistance exhibited by the film can be provided by a certain weight of the load acts on the relatively small contact area, by measuring the ability of the film antideformation manifested, so the film hardness is a view showing one of the important propertiesRead More …

What is general mechanical properties of powder coatings

properties of powder coatings Hardness tester

The general mechanical properties of powder coatings include the following. Cross-cut Test (adhesion) Flexibility Erichsen Buchholz Hardness Pencil Hardness Clemen Hardness Impact Cross-cut Test (adhesion) According the standards ISO 2409, ASTM D3359 or DIN 53151. On the coated test panel a cross-cut (indentations in the form of a cross and parallel to each other with a mutual distance of 1 mm or 2 mm) is made on the metal. A standard tape is put on the cross-cut. The cross-cut isRead More …

what is Powder Coating MSDS

powder coating msds

Powder Coating MSDS 1. CHEMICAL PRODUCT AND COMPANY IDENTIFICATION PRODUCT NAME:   Powder Coating MANUFACTURE/DISTRIBUTOR: Jinhu Color Powder Coating Co., Ltd Address: Dailou Industrial Zone,Jinhu County,Huai’an,China Emergency Response Call: 2. COMPOSITION/INFORMATION ON INGREDIENTS HAZARDOUS INGREDIENTS : CAS No.   WEIGHT (%) Polyester resin : 25135-73-3   60 Epoxy resin : 25085-99-8   20 Barium sulfate: 7727-43-7   10 Pigments: N/A   10 3. HAZARDS IDENTIFICATION Primary Routes of Exposure : Skin Contact,Eye Contact . Inhalation :Inhalation of dust or mist caused during heating and processing can cause irritation of nose, throat and lungs,headache,nausea Eye Contact :Material can cause irritation Skin ContactRead More …

ASTM D7803-Standard for Preparing HDG steel for powder coatings

coil powder coating

ASTM D7803 Bridges are one example of construction projects that are often built from hot-dip galvanized steel. How to coat this steel without adhesion failure of the powder system is explained in the new ASTM standard. The new standard, ASTM D7803, “Practice for Preparation of Zinc (Hot-Dip Galvanized)Coated Iron and Steel Product and Hardware Surfaces for Powder Coatings” covers surface preparation and thermal pretreatment of iron and steel products and hardware which have not been painted or powder coated previouslyRead More …

Prevention of powder coating orange peel

Powder coating orange peels

Prevention of powder coating orange peel The appearance of the coating is becoming increasingly important in the new equipment manufacturing (OEM) Painting. Therefore, one of the main objectives of the coatings industry is to make the final requirements of the user paints to achieve the best performance, which also includes the surface appearance of satisfaction. Affect the visual effects of the surface condition by the factors such as color, gloss, haze, and surface structure. The gloss and image clarity isRead More …

Classification of Adhesion Test Results-ASTM D3359-02

ASTM D3359-02

Inspect the grid area for removal of coating from the substrate or from a previous coating using the illuminated magnifier. Rate the adhesion in accordance with the following scale illustrated in Fig. 1: 5B The edges of the cuts are completely smooth; none of the squares of the lattice is detached. 4B Small flakes of the coating are detached at intersections; less than 5 % of the area is affected. 3B Small flakes of the coating are detached along edgesRead More …

Adhesion problem of powder coating application

Poor adhesion is usually related to poor pretreatment or under cure. Undercure -Run an electronic temperature recording device with a probe on the part to ensure that the metal temperature reaches the prescribed cure index (Time at temperature). Pretreatment – Perform regular titration and quality checks to avoid a pretreatment problem.Surface preparation is probably the cause of the poor adhesion of the powder coating powder. Not all stainless steels accept phosphate pretreatments to the same extent; some being more reactiveRead More …