Irreversible Warmup Indicators.
Abstract
Irreversible warmup indicators indicating in the 10 -15 c region were developed and prototypes manufactured. The device comprises a gelatin capsule filled with an organic liquid which freezes at the temperature to be indicated. The liquid contains a dye and the capsule is maintained in contact with absorbent paper. When frozen the contraction of the liquid draws air in through the joint in the capsule and upon thawing a portion of the liquid is exuded through the joint, coloring the paper and thereby providing the desired indication. Practical tests, including attachment to blood bags, establish a reliability of better than 98%. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Jul 01, 1973
- Accession Number
- ADA030590
Entities
People
- Frank E. Swindells