SCP-431
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SCP-431, front view.

ALERT: AS OF ██-██-2009, SCP-431 IS CLASSIFIED AS MISSING. REFER TO DOSSIER RM-46 FOR DETAILS.

Item #: SCP-431

Object Class: Euclid

Special Containment Procedures: Due to its unique properties and potential for misuse, SCP-431 is to be kept in the level three armory of Site #██ when not being tested. Access by personel of level 2 or lower is As of 01/13/██, all personnel requesting research time with SCP-431 are to be accompanied by a class C fire suppression team. See addendum A1 for details.

Description: SCP-431 appears to be a jacket composed of black imitation leather, size large. Distinguishing marks include beige bands that run from the shoulders to the ends of both sleeves, as well as four pockets, two with zippers on the chest, and two open pockets lower on the torso which are commonly used to warm the wearer's hands in cold weather. SCP-431 also has a two (2) inch tear in the back just above the wearer's left kidney.

SCP-431 has several unique properties that make it extremely useful. The jacket is completely indestructible by normal means. All attempts to damage the jacket, ranging from attempts to cut it with a simple knife to high energy particle beams, have failed. SCP-431 is also completely opaque to all forms of electromagnetic radiation and does not transfer heat at all. Test S-431-021 placed a temperature sensor in contact with the inside of the jacket and an active blowtorch on the other side. After two (2) hours, there was zero temperature fluctuation in the sensor and the jacket remained slightly warm to the touch. Temperature measurements of the jacket itself show it to maintain a steady 37 degrees Celsius despite ambient conditions.

While completely indestructible, the jacket does transfer kinetic energy. Medical analysis of deceased Class D personnel in live fire experiments have shown that the cause of death is always blunt impact trauma rather than cavitation injuries; the bullets do not pierce the jacket, but the kinetic energy is transferred through it and still results severe injury.

Research staff have reported that the jacket is comfortable enough to wear, despite being somewhat inflexible. The zippers, however, remain non-functional. The front of the jacket cannot be zipped up and the chest pockets have so far resisted forces of up to 45,000 Newtons. The left chest pocket seems to contain a circular, flat object approximately the size of a US half dollar. Any attempts to remove the object have failed, and Dr. ██████ has hypothesized that the mystery item is actually the source of the jacket's invulnerability, but this cannot be confirmed, as analysis of the object is impossible while the jacket pocket remains closed.

All attempts to discover the jacket's composition have failed. It appears to be a normal fake leather jacket under microscopic observation and other methods of analysis, such as laser ablation and mass spectrometer, have yielded no results. The small rip in the jacket cannot be repaired, as any attempts to pierce the jacket with needle and thread have failed.

Addendum A1:

An additional characteristic of SCP-431 has come to light. During experiment S-431-057, a Level One staff member was performing a duration test of SCP-431. Subject was assigned to wear SCP-431 consecutively for 24 hours. Subject wore a standard X2 sensor harness to monitor subject's vital signs and record any noticeable changes in the jacket. After precisely 22 hours and 17 minutes of constant wear, a spike in SCP-431's temperature was detected. Shortly thereafter, subject complained of feeling overly warm. The monitoring rig then picked up an exponential increase in the temperature of SCP-431. Forty five seconds after the initial temperature spike, the sensors recorded a temperature of 250 degrees Celsius.

During this period, the subject responded first with discomfort, then pain, then increasing levels of terror as they attempted to remove the jacket, but was unsuccessful. Dr. ██████ ████, who was observing the experiment at the time, attempted to assist the subject, but was unable to. sixty seconds after the initial spike, the monitor rig reported a temperature of 600 degrees Celsius. Shortly thereafter, the device failed.

The subject lived for approximately two minutes thirty seconds after that. Despite the massive observed physical damage, the subject did not appear to pass into shock at any point and was fully conscious until their termination. Four minutes after the initial temperature spike, the emergency response team arrived. They were also unable to remove SCP-431 from the subject. Two minutes later, a secondary research time arrived. Using a standard infrared thermometer, they determined the temperature of the jacket to have peaked at 760 degrees Celsius, the approximate ignition point of human skin. Two further minutes later, the body of the subject burst into flames. The fire suppression squad immediately put it out, but the fire re-ignited shortly after. The fire suppression team attempted to put out the fire two more times, but it reignited each time. All personnel then stood by as the fire consumed the subject's remaining body mass. After all body mass was removed, SCP-431 immediately cooled back to its regular temperature of 37 degrees Celsius. The remains of the sensor harness was discovered within, melted and non-functional.

Dr. ████ and two members of the emergency response team received second and third degree burns. All have made a full recovery.

Addendum A2:

After a review of experiment S-431-021, SCP-431 has been upgraded to Euclid class.

Addendum A3:

Further experimentation with Class D personnel has determined that the jacket always behaves in the same manner. Exactly 22 hours and 17 minutes of consecutive wear, the temperature of the jacket spikes to 760 degrees Celsius and remains that way until the wearer is completely consumed or the jacket is removed. Removal typically becomes impossible more than thirty seconds after the initial temperature spike. Attempts to remove the SCP-431 after this point result in large portions of the wearer's skin coming off with it.

SCP-431 only displays these effects on human subjects. Other primates coerced into wearing it display no adverse effects after the 24 hour mark. Additionally, both arms must be through both sleeves for the temperature spike to occur.

Subjects that are able to remove SCP-431 after the 15 second mark all have an identical circular mark burned into the upper left portion of their chests, similar to the object contained in the jacket's pocket. The unidentified object itself remains apparently unaffected by SCP-431's rapid temperature changes.

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