The Gardco/ISO Mini Dip and Standard Viscosity Cups are produced with easily removable orifices of the Gardco "Snap-In, Snap-Out" type. Cup and orifice production tolerance permits replacement or inter-change of orifices without loss of acceptable cup accuracy. They are designed to comply with requirements of International Standard ISO 2431 and ASTM D5125, conform to ISO 9000 when ordered with calibration certification, and qualifies under ANSI/NCSL Z540 or ISO/IEC 17025, ISO 9001 as applicable.
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Mini Dip Cup with: 3mm, 4mm & 6mm Orifices
Standard Cup with: 3mm, 4mm, 6mm and 8mm Orifices
Conversion formulas & table relating efflux time in seconds, to the nearest tenth second, to viscosity in centistokes are furnished with each GARDCO/ISO viscosity cup.
Calibration of the GARDCO/ISO cup is traceable to the National Institute of Standards and Technology.
The GARDCO/ISO viscosity cup is machined from solid aluminum bar stock with removable stainless steel orifices.
The cup has been greatly reduced in weight by removal of excess metal on the lower portion of the cup adjacent to the orifice. This reduces errors due to possible temperature change imposed by the cup.
A horizontal ledge existing at the top of the orifice in earlier cups has been eliminated.
Exterior cup dimensions are chosen to fit existing support stands for the Gardco Ford Cup series.
Orifice Interchange (not applicable to certified cups) - Production tolerance on the Gardco Standard ISO cup, the Gardco/ISO Mini Dip Cup and the orifice, whether it be 3mm, 4mm, or 6mm, is sufficiently close to permit interchange of orifices in any one cup or between cups. For convenience and for best possible results, however, it is recommended that such interchanges be held to a minimum.
The orifices for the cup are machined from stainless steel with the exact conical exterior to match the opening in the base of the cup. Positive orifice identification is assisted by "steps" at the base of the orifice as shown in the cross section drawing. (See "Care of Cup" for orifice removal instructions.)
The following is quoted in part from the rationale of the ASTM for the inclusion in ASTM standards, a reference for the design and use of the ISO viscosity cups: “In the 1984 edition of Recommendations of the Committee of Experts on the Transportation of Dangerous Goods, and in similar documents of the International Civil Aviation Organization (ICAO) and of the International Maritime Organization (IMO), an ISO Flow Time Test (ISO 2431) appears. It is used as one of several criteria used to permit shippers of paint and other viscous materials to transport them as a less hazardous material than that indicated by flash point alone. (Request our Flash Point Tester Literature) The three standards involved are: 1. viscosity (ISO 2431), 2. flash point (ISO 1523/ASTM D3941), and 3. solvent separation test (Now being proposed as an ASTM method.)”.
|Orifice||Seconds Range||Centistoke Range||Midrange Sensitivity ¹||Calibration Oil No./ Cenistokes ²|
|3mm||27 → 120||4.6 → 52||.05||#G 10/19Cs|
|4mm||21 → 120||19 → 163||1.4||#G 35/68Cs|
|6mm||17 → 120||84 → 823||7.1||#G 100/233Cs|
|8mm||10 → 120||187 → 2611||22||#G 350/878Cs|
|¹ Stated as centistokes per second of efflux time.|
² Centistoke values are nominal - actual values printed on labels
ISO Standard Cup
The body of the cup is machined from solid aluminum bar stock. Note from the cross section drawing of the cup the relatively deep well surrounding the top of the cup which serves to catch any overflow from the filling of the cup. Note also the conical opening for the orifice which permits gentle “tapping in” or “tapping out” of the orifice. Orifice design provides for extension between the opening in the body and the lowermost extension of the cup. This design ensures protection for the orifice and prevents interference with the efflux stream by any contamination surrounding the orifice.
The orifices for the cup are machined from stainless steel with the exact conical exterior to match the opening in the base of the cup. Positive orifice identification is assisted by “steps” at the base of the orifice as shown in the following cross section drawing.
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ISO Dip Cup Instructions
ISO Standard Cup Instructions