Property talk:P4842

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ASHRAE refrigerant number
identifier of a refrigerant assigned in ANSI/ASHRAE standard 34

Data type	External identifier
Domain	type of chemical entity (Q113145171) or mixture (Q169336)
Allowed values	[a-zA-Z]?\d{2,4}([a-zA-Z][\da-z])?(\([a-zA-Z]\))?
Example	ammonia (Q4087) → 717 nitrous oxide (Q905750) → 744A octafluorocyclobutane (Q413079) → C318 trichloromonofluoromethane (Q423000) → 11
Source	https://www.ashrae.org/technical-resources/standards-and-guidelines/ashrae-refrigerant-designations
Lists	Items with the most statements of this property Count of items by number of statements (chart) Items with the most statements Items with the fewest statements Count of items by number of sitelinks (chart) Items with the most sitelinks Items with the most sitelinks, but no link to one Wikipedia (sample: Welsh Wikipedia, cywiki) Items with the fewest sitelinks Most linked wikis Items with the most identifier properties Items with no other external identifier Items with no other statements Most recently created items Items with novalue claims Items with unknown value claims Usage history (total) Usage history (main statement) Database reports/Constraint violations/P4842 Map Random list
Proposal discussion	Proposal discussion
Current uses	Total 63 Main statement 59 93.7% of uses Qualifier 4 6.3% of uses
Search for values

[create Create a translatable help page (preferably in English) for this property to be included here]

Single value: this property generally contains a single value. (Help)

Exceptions are possible as rare values may exist. Exceptions can be specified using exception to constraint (P2303).
List of violations of this constraint: Database reports/Constraint violations/P4842#Single value, SPARQL

Distinct values: this property likely contains a value that is different from all other items. (Help)

Exceptions are possible as rare values may exist. Exceptions can be specified using exception to constraint (P2303).
List of violations of this constraint: Database reports/Constraint violations/P4842#Unique value, SPARQL (every item), SPARQL (by value)

Format “[a-zA-Z]?\d{2,4}[a-zA-Z]?[\da-z]?(\([a-zA-Z]\))?”: value must be formatted using this pattern (PCRE syntax). (Help)

Exceptions are possible as rare values may exist. Exceptions can be specified using exception to constraint (P2303).
List of violations of this constraint: Database reports/Constraint violations/P4842#Format, SPARQL

Type “type of chemical entity (Q113145171), mixture (Q169336)”: item must contain property “instance of (P31)” with classes “type of chemical entity (Q113145171), mixture (Q169336)” or their subclasses (defined using subclass of (P279)). (Help)

List of violations of this constraint: Database reports/Constraint violations/P4842#Type Q113145171, Q169336, hourly updated report, SPARQL

Allowed entity types are Wikibase item (Q29934200): the property may only be used on a certain entity type (Help)

Exceptions are possible as rare values may exist. Exceptions can be specified using exception to constraint (P2303).
List of violations of this constraint: Database reports/Constraint violations/P4842#Entity types

Item “has use (P366): refrigerant (Q266790)”: Items with this property should also have “has use (P366): refrigerant (Q266790)”. (Help)

Exceptions are possible as rare values may exist. Exceptions can be specified using exception to constraint (P2303).
List of violations of this constraint: Database reports/Constraint violations/P4842#Item P366, search, SPARQL

Scope is as main value (Q54828448): the property must be used by specified way only (Help)

Exceptions are possible as rare values may exist. Exceptions can be specified using exception to constraint (P2303).
List of violations of this constraint: Database reports/Constraint violations/P4842#Scope, SPARQL

Regex seems to match more than it should

As far as i know the first letter can only be an [cC]. But i have not a source yet so no correction till i found one and i can be sure. R Focke (talk) 09:04, 22 April 2023 (UTC)

Apparently E and R are also valid prefices, don't know if there are more: https://www.ashrae.org/technical-resources/standards-and-guidelines/ashrae-refrigerant-designations Infrastruktur (talk) 23:07, 27 April 2023 (UTC)