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Stopper
- What is a stopper?
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  • What is a stopper?
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Raw Materials
A stopper is flexible, and it is translucent or opaque. It does not have a specific color. The color of a stopper is determined by additives. A stopper is insoluble in tetrahydrofuran solution, and it may be inflated when it is in the said solvent. A stopper has a uniform structure and does not contain any dangerous materials.
Shape and Dimensions
The shape and dimensions of a stopper shall be in accordance with those specified in the approved detailed drawing.
Appearance of Stopper
Stopper Color : The color of stopper shall be uniform and shall not have any stained spot. The color shall be also in accordance with that specified in the approved drawing.
Stopper Surface : The outer surface and the inner surface of a stopper shall be siliconed and have no roughness and short shot. The edge of a stopper shall be processed evenly.
Stopper Cross-section : The foot of a stopper shall maintain a certain consistent value of centripetal rate from the edge.
Stopper Impurities : Any impurities shall not be seen with the naked eye in a stopper and any outside impurities shall not be attached on the surface of a stopper.
Shape and Dimensions
The shape and dimensions of a stopper shall be in accordance with those specified in the approved detailed drawing.
Characteristics
Elasticity : The length of a rubber piece with an area of 1mm©÷ to 5mm©÷ when it is stretched shall be extended more than twice its original length. Stretch it as the length becomes more than twice its original length for one minute and release it. At this time, the rubber piece shall be shrunk to 1.2 times its original length within 30 seconds.
Infrared Absorption Spectrophotometry : Dehydrate 1 to 2 grams of test materials in a refractory tube by opening flame. Keep applying the heat until the pyrolyzate steam at the edge of the tube. Drop a few drops of pyrolyzate on the pastille and perform measure using the infrared absorption spectrophotometer. Perform a comparison analysis of the spectrums gained from the samples.
Ashes : The total amount of ashes shall be less than 10 percent of the results gained from the test sample.
Characteristics of Liquid S
Acidity and Basicity
In order to obtain a blue or yellow color in an appropriate state, the volume of sodium hydroxide solution and hydrochloric acid solution shall not exceed 0.3ml and 0.8ml, respectively.
Light absorption
The light absorption within the range of wavelengths from 220mm to 360mm shall not exceed 0.2.
Reduction of Material
The volume difference between two liquid solutions in an appropriate state shall not exceed 3.0ml.
Ammonium Ion
2 ¥ìg/mL (2ppm as NH©þ+)
Extraction of Zinc
The amount of zinc extracted shall not exceed 5¥ìg per 1mL.
Extraction of Heavy Metals
The amount of heavy metals extracted shall not exceed 2¥ìg. (2ppm as Pb©÷+)
Residue after Evaporation
The amount of residue after evaporation shall not exceed 2.0mg.
Volatile Sulfide
Any black stain shall not have sodium sulfide with an amount exceeding 0.154mg and the standard amount for a 20g/L strong acid solution.
Penetrability
The force required for penetrating the coasted surface of a stopper shall not exceed 10N with a tolerance of ¡¾0.25N(25gf).
Fragment
The acceptable value shall be measured over 5 stoppers through 48 times of infiltration using a needle with a diameter of 0.8mm.
Form of Rubber Compounding and Silicon Grade
The form of rubber compounding and the silicon grade shall satisfy the EP conditions.
Resistance to Sterilization 2 X 121¡É
Color, pattern and viscosity of the surface with durability.
Color of Solution
The solution shall not have any color.