The sound insulation standards for the design of soundproof rooms usually refer to relevant national or industry standards to ensure that their sound insulation effect meets expectations. Here are some common sound insulation standards:
 
1. ISO 140 series standards: This is a testing and evaluation standard for building components and building sound insulation performance published by the International Organization for Standardization (ISO). Among them, ISO 140-3 and ISO 140-4 respectively provide detailed testing methods for airborne sound insulation and impact sound insulation.
 
2. GB/T 1988-2005: This is the Chinese national standard "Soundproofing Doors for Buildings". This standard specifies the requirements, testing methods, and inspection rules for the sound insulation performance of soundproof doors.
 
3. ASTM E90: This is a standard published by the American Society for Testing and Materials (ASTM) regarding the sound insulation performance of building materials. This standard specifies the method for determining the sound insulation performance of building materials under laboratory conditions.
 
4. EN ISO 10140-2: This is a European standard that specifies the testing methods for the sound insulation performance of building components. This standard is similar to the ISO 140 series standards, but differs in certain details.
 
5. GB/T 50121-2009: This is the Chinese national standard "Code for Design of Sound Insulation in Buildings". This standard specifies the basic principles, methods, and requirements for building sound insulation design.
 
These standards usually specify the testing methods, evaluation indicators, and acceptance criteria for sound insulation performance to ensure that the sound insulation effect of the soundproof room meets expectations. When designing a soundproof room, designers usually refer to these standards and combine them with specific needs for the design.