Fluorescent and visible penetrant inspection
AssigneeSherwin, Inc.
InventorArnold E. Zaelke
Life of this patent
Estimating the term…
Abstract
An environmentally friendly penetrant used in non-destructive testing of material includes a vegetable oil fatty acid ester. A first embodiment of the penetrant is a post-emulsifiable fluorescent penetrant, a second embodiment of the penetrant is a heatable fluorescent penetrant, a third embodiment of the penetrant is a water washable fluorescent penetrant, a fourth embodiment of the penetrant is a visible water washable penetrant, and a fifth embodiment is a visible solvent removable penetrant. The heatable fluorescent penetrant includes a phenolic antioxidant to provide stability to at least approximately 120 degrees Fahrenheit. A method for using the heatable fluorescent penetrant includes heating the penetrant to lower penetrant viscosity and thus provide better penetration into flaws in the material.
Claims21
A penetrant comprising:
- a solvent comprising between approximately 20 percent by weight and approximately 50 percent by weight of vegetable oil fatty acid ester;
- dye;
- and
- between approximately 35 percent by weight and approximately 45 percent by weight of blend of phenyl phosphates.
A visible water washable penetrant consisting essentially of:
- between approximately 40 percent by weight and approximately 50 percent by weight of a Vegetable Oil Fatty Acid Ester;
- between approximately 5 percent by weight and approximately 8 percent by weight of a Dye;
- between approximately 20 percent by weight and approximately 30 percent by weight of a Wetting agent;
- and
- between approximately 20 percent by weight and approximately 30 percent by weight of a Carrier and Penetrant Agent comprising Tripropylene Glycol Methyl Ether.
A post-emulsifiable fluorescent penetrant comprising:
- between approximately 20 percent by weight and approximately 50 percent by weight of vegetable oil fatty acid ester
- between approximately one percent by weight and approximately two percent by weight of fluorescent dye;
- between approximately one percent by weight and approximately two percent by weight of fluorescent brightener;
- between approximately 35 percent by weight and approximately 45 percent by weight of blend of phenyl phosphates;
- between approximately 20 percent by weight and approximately 30 percent by weight of phthalate ester;
- and
- between approximately three percent by weight and approximately five percent by weight of ethoxylated alcohol wetting agent.
A post-emulsifiable fluorescent penetrant comprising:
- between approximately 20 percent by weight and approximately 50 percent by weight vegetable oil fatty acid ester;
- between approximately one percent by weight and approximately 2 percent by weight naphthalimide fluorescent yellow dye;
- between approximately one percent by weight and approximately 2 percent by weight bensoxazole derivative fluorescent brightener;
- between approximately 35 percent by weight and approximately 45 percent by weight blend of moxo, di and triphenyl phosphates;
- between approximately 20 percent by weight and approximately 30 percent by weight di-nonyl phthalate ester;
- and
- between approximately 3 percent by weight and approximately 5 percent by weight ethoxylated alcohol having a Hydrophilic/Lipophilic Balance (HLB) of between approximately 8.0 and approximately 8.5.
A heatable fluorescent penetrant comprising:
- between approximately 20 percent by weight and approximately 50 percent by weight of vegetable oil fatty acid ester;
- between approximately one percent by weight and approximately two percent by weight of fluorescent dye;
- between approximately one percent by weight and approximately two percent by weight of fluorescent brightener;
- between approximately 35 percent by weight and approximately 45 percent by weight of blend of phenyl phosphates;
- between approximately 20 percent by weight and approximately 30 percent by weight of di-nonyl phthalate ester;
- between approximately three percent by weight and approximately five percent by weight of ethoxylated alcohol wetting agent having a Hydrophilic/Lipophilic Balance (HLB) of between 8.0 and 8.5;
- and
- a phenolic antioxidant thereby allowing the penetrant to be heated above ambient temperature for better penetration while remaining stable.
A visible water washable penetrant comprising:
- between approximately 20 percent by weight and approximately 50 percent by weight of vegetable oil fatty acid ester;
- between approximately five percent by weight and approximately eight percent by weight of visible dye;
- between approximately twenty percent by weight and approximately thirty percent by weight of ethoxylated alcohol wetting agent;
- between approximately twenty percent by weight and approximately thirty percent by weight of Tripropylene Glycol Methyl Ether.
Dependencies are inferred from the claim text.