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How Temperature Affects Viscosity

  How Temperature Affects Viscosity: Viscosity can be defined as the internal friction that occurs as a material flow, relative to itself....

2020年10月21日星期三

 

ZHONGWANG UV1900 serial Double Beam Spectrophotometer

UV1900 series


Introduction:

The UV1900 series is a new generation of double beams UV-Visible Spectrophotometers. The instruments are professionally manufactured to a very high specification with excellent quality control. This ensures high performance characteristics, flexibility and user friendliness.

 

Function:

The UV1901 and UV1902 are able to carry out the following analysis: Photometric, spectrum, advanced quantitative and kinetics measurement. When interfaced to a PC the software offers many more applications and analysis.

 

The UV1900 series is extensively used for the analysis of foods, drugs, agricultural products and is widely used in organic, inorganic, petroleum, pharmacy, environmental, bio-chemistry, optics, metallurgy, mineral institutes and industries.

 

Features:

The UV1901 and UV1902 have a wavelength range of 190nm to 1100nm. The only difference between the UV1901 and UV1902 is the bandwidth which is at 1 nm in the UV1901 while it is at 2nm in the UV1902 instrument.

 

UV1900 series has excellent optical performance and lower stray light. The advanced circuit measurement and control system ensures the machine with high stability and extremely low noise. The detachable sample chamber can accommodate varied accessories to suit different applications user may encounter. The design of open spacious light source chamber allows unique pre-aligned deuterium and halogen lamp for easy lamp replacement to avoid optical adjustment.

Display System LCD 320*240

Light source lamp: preset Japan Hamamastu deuterium lamp / OSRAM Long life halogen tungsten lamp

Specifications:

Model

UV1901

UV1902

Photometric methods:

Transmittance, Absorbance, Energy, Reflectivity

Wavelength range:

190nm-1100nm

Special Bandwidth:

1nm

2nm

Stray light:

0.03%T (220nm,  360nm)

0.05%T (220nm,  360nm)

Wavelength accuracy:

±0.3nm

Wavelength reproducibility:

≤0.1nm

Photometric range:

-4A ~ 4A

Photometric accuracy:

≤±0.3%T (0-100%T)

≤±0.002A (0-0.5A)

≤±0.004A (0.5-1A)

Photometric reproducibility:

0.001A (0-0.5A)

0.002A (0.5-1A)

Stability:

±0.004A/h

Noise:

≤ ±0.003A

Baseline flatness:

±0.0008A(190nm-1100nm)

±0.001A(190nm-1100nm)

Power:

100-240V, 50/60Hz

Light source:

Deuterium & Tungsten-halogen lamp

 

Accessories:

  UV1900 series Spectrophotometer

1 set

  Power Cable

1 pc

  Operation Manual

1 pc

  Certificate of quality checking

1 pc

  Fuses (2 A)

2 pcs

  10mm quartz cuvettes

2 cases

  10mm Glass cuvettes

4 cases

  Compact Disc

1 pc (UV1901PC & UV1902PC only)

  RS-232 cable

1 pc (UV1901PC & UV1902PC only)

  Dust cover

1 pc

 

Software specifications:

1.     Such operation as photometric measurement, spectrum measurement, quantitative measurement, kinetic measurement are offered in UVCON Windows applications.

2.     Single and Multi-wavelength quantitative measurement can be measured with several kinds of arithmetic calculation methods to meet users’ demand.

3.     Curves can be measured and recalled in memory with data-handling of arithmetic calculation smooth, Abs to/ from %T conversion and peak pick.

4.     The measured data and graphics can be stored on PC/ printed/ output for reports.

                                 Outstanding quality, keeping constant improving

 

2020年3月20日星期五

Handbook of COVID-19 Prevention and Treatment

https://drive.google.com/file/d/1zPkSKEvLBLgmkyQGNx8yxIo1_d1G4ycw/view?fbclid=IwAR2H12B2JLXKH5f1Dx9hvkhVblUIhraTuqhJwlxy-ashsmygeW-j3gKKl6o

2018年12月4日星期二

Zonwon IVS800-2 Automatic Viscosity Measuring System



FULL AUTOMATIC MACHINE

1.Auto sampling

2.Auto measuring

3.Auto caulate

4.Auto washing



Measuring Range: 0.3…100,000mm2/s(MPa ﹒s)

Temp Accuracy: Betterthan±0.01℃

Timing accuracy: 0.01 s

Temperature range: 5-95 ℃

Measure position: 2

Heating power: 1 kw

Weight: 50 kg

Size:  66x32x68cm  L*W*H

2018年8月16日星期四

Kinematic viscosity and dynamic viscosity unit conversion table

http://www.zonwontech.com/%E8%BF%90%E5%8A%A8%E7%B2%98%E5%BA%A6%E5%8D%95%E4%BD%8D%E6%8D%A2%E7%AE%97%E8%A1%A8%E5%92%8C%E5%8A%A8%E5%8A%9B%E7%B2%98%E5%BA%A6%E5%8D%95%E4%BD%8D%E6%8D%A2%E7%AE%97%E8%A1%A8

2018年8月7日星期二

International standards - Plastics and rubber

International standards - Plastics and rubber
ASTM D1238 This test method covers measurement of the rate of extrusion of molten resins through a die of a specified length and diameter under prescribed conditions of temperature, load, and piston position in the barrel as the timed measurement is being made.
ASTM D1414 These test methods describe the procedures for determining the physical properties of O-rings and changes in these properties due to aging.
ASTM D1456 This test method covers determination of the elongation of soft vulcanized rubber compounds under a specified stress.
ASTM D1621 This test method describes a procedure for determining the compressive properties of rigid cellular materials, particularly expanded plastics.
ASTM D1708 This test method covers the determination of the comparative tensile strength and elongation properties of plastics in the form of standard microtensile test specimens when tested under defined conditions of pretreatment, temperature, humidity, and testing machine speed. It can be used for specimens of any thickness up to 3.2 mm (1/8 in.), including thin films.
ASTM D1894 This test method covers determination of the coefficients of starting and sliding friction of plastic film and sheeting when sliding over itself or other substances at specified test conditions. The procedure permits the use of a stationary sled with a moving plane, or a moving sled with a stationary plane. Both procedures yield the same coefficients of friction values for a given sample.
ASTM D2412 This test method covers the determination of load-deflection characteristics of plastic pipe under parallel-plate loading.
ASTM D2653 This test method covers the determination of the tensile properties of "as produced" elastomeric yarns made from natural rubber, spandex or other elastomers, using a constant-rate-of-extension (CRE) type tensile testing machine.
ASTM D2731 This test method covers the determination of elastic properties of "as produced" elastomeric yarns made from rubber, spandex or other elastomers. Elastic properties include force at specified elongations, permanent deformation and stress decay. Other hysteresis related properties can be calculated.
ASTM D2990 These test methods cover the determination of tensile and compressive creep and creep-rupture of plastics under specified environmental conditions
ASTM D3291 This practice determines the compatibility of plasticizers in poly(vinyl chloride) plastics by rating the amount of plasticizer that spews due to compressional stress set up inside a 180 loop bend.
ASTM D380 These test methods describe procedures for inspection and test of all types and constructions of rubber hose.
ASTM D3826 This practice covers the determination of a degradation-end point (a brittle point) for degradable polyethylene/polypropylene films and sheeting less than 1.0 mm (0.04 in.) thick.
ASTM D3846 This test method covers the determination of the in-plane shear strength of reinforced thermosetting plastics in flat sheet form in thicknesses ranging from 2.54 to 6.60 mm (0.100 to 0.260 in.)
ASTM D3914 This test method covers the determination of the in-plane shear strength of pultruded, glass-fiber reinforced, thermosetting plastic rod of diameters ranging from 19 to 32 mm (¾ to 1¼ in.)
ASTM D3916 This test method describes a procedure for determining the tensile properties of pultruded, glass-fiber-reinforced thermosetting plastic rod of diameters ranging from 3.2 mm (1/ 8 in.) to 25.4 mm (1 in.)
ASTM D395 These test methods cover the testing of rubber intended for use in applications in which the rubber will be subjected to compressive stresses in air or liquid media. They are applicable particularly to the rubber used in machinery mountings, vibration dampers, and seals.
ASTM D412 These test methods cover procedures used to evaluate the tensile (tension) properties of vulcanized thermoset rubbers and thermoplastic elastomers. These methods are not applicable to ebonite and similar hard, low elongation materials.
ASTM D413 These test methods cover the determination of the adhesion strength between plies of fabric bonded with rubber or the adhesion of the rubber layer in articles made from rubber attached to other material.
ASTM D429 These test methods cover procedures for testing the static adhesional strength of rubber to rigid materials (in most cases metals).
ASTM D4321 This test method covers the determination of yield (area per unit mass) of plastic film.
ASTM D4475 This test method covers the determination of the apparent horizontal shear strength of fiber reinforced plastic rods.
ASTM D4476 This test method covers the determination of the flexural properties of fiber-reinforced pultruded plastic rods.
ASTM D4482 This test method covers the determination of fatigue life of rubber compounds undergoing a tensile-strain cycle. During part of the cycle, the strain is relaxed to a zero value.
ASTM D5083 This test method covers the determination of the tensile properties of thermosetting reinforced plastics using test specimens of uniform nominal width when tested under defined conditions of pretreatment, temperature, humidity, and testing-machine speed.
ASTM D5748 This test method determines the resistance of a stretch wrap film to the penetration of a probe at a standard low rate, a single test velocity.
ASTM D575 These test methods describe two test procedures for determining the compression-deflection characteristics of rubber compounds other than those usually classified as hard rubber and sponge rubber.
ASTM D5868 This test method describes a lap shear test for use in measuring the bonding characteristics of adhesives for joining fiber reinforced plastics to themselves and to metals. The method is applicable to random and fiber oriented FRP.
ASTM D6049 The viscosity and elasticity of unvulcanized rubbers and rubber compounds are determined by subjecting cylindrical test pieces to a compression/recovery cycle. The dependency on shear rate at constant shear stress is evaluated and the material fatigue behavior is determined in repeat cycle testing.
ASTM D6147 This standard specifies two methods for determining the decrease in counterforce exerted by a test specimen of vulcanized rubber or thermoplastic elastomer which has been compressed at a constant deformation under specified conditions of time and temperature.
ASTM D624 This test method describes procedures for measuring a property of conventional vulcanized thermoset rubber and thermoplastic elastomers called tear strength.
ASTM D6272 This test method covers the determination of flexural properties of unreinforced and reinforced plastics, including high-modulus composites and electrical insulating materials in the form of rectangular bars molded directly or cut from sheets, plates, or molded shapes.
ASTM D6324 These test methods cover and shall be used to evaluate male condoms made of various synthetic materials.
ASTM D638 This test method covers the determination of the tensile properties of unreinforced and reinforced plastics in the form of standard dumbbell-shaped test specimens when tested under defined conditions of pretreatment, temperature, humidity, and testing machine speed.
ASTM D6515 This test method covers a procedure to determine the recovery response of rubber after particular bending deformation, subsequent to aging in selected media at a specified temperature, and for a specified time period, thus providing a measure of the relative performance potential of compounds used in the manufacture of shaft seals.
ASTM D6742 This practice provides instructions for modifying open-hole tension and compression test methods to determine filled-hole tensile and compressive strengths.
ASTM D6746 This test method describes a method to evaluate a characteristic of raw rubber or unvulcanized rubber compounds, or both, that is designated as tensile green strength.
ASTM D695 This test method covers the determination of the mechanical properties of unreinforced and reinforced rigid plastics, including high-modulus composites, when loaded in compression at relatively low uniform rates of straining or loading.
ASTM D732 This test method covers the punch-type of shear test and is intended for use in determining the shear strength of test specimens of organic plastics in the form of sheets and molded disks in thicknesses from 0.127 to 12.7 mm (0.050 to 0.500 in.)
ASTM D790 These test methods cover the determination of flexural properties of unreinforced and reinforced plastics, including high-modulus composites and electrical insulating materials in the form of rectangular bars molded directly or cut from sheets, plates, or molded shapes.
ASTM D882 These test methods describe tests to measure the properties of adhesives, commonly called rubber cements, that may be applied in plastic or fluid form and that are manufactured from natural rubber, reclaimed rubber, synthetic elastomers, or combinations of these materials.
ASTM D926 This test method covers the determination of plasticity and recovery of unvulcanized rubber by means of the parallel plate plastometer. Uncompounded, compounded, and reclaim rubber may be tested.
ASTM D953 This test method covers the determination of the bearing strength of rigid plastics in either sheet or molded form.
ASTM F1304 This test method is used to determine the deflection of relatively rigid resilient floor tile such as vinyl composition tile.
ASTM F152 These test methods cover the determination of tensile strength of certain nonmetallic gasketing materials at room temperature.
ASTM F1574 This test method covers the determination of compressive strength characteristics (crush-extrusion resistance) of gasket materials at elevated temperature.
ASTM F2018 This test method covers the requirements to determine the time-to-failure of thermoplastic resins for piping applications by uniaxial loading of a grooved tensile test specimen.
ASTM F36 This test method covers determination of the short-time compressibility and recovery at room temperature of sheet-gasket materials.
ASTM F607 This test method provides a means of determining the degree to which gasket materials under compressive load adhere to metal surfaces.
ASTM F806 This test method covers determination of the short-time compressibility and recovery at room temperature of laminated composite gasket materials.