Design & Engineering

S.V. Techsol’s has over 20 years of experience designing solutions for the semiconductor, disc drive, pharmaceutical, food processing, and related industries. Our in-depth knowledge of environment factors, clean air standards, manufacturing design and assembly allows our engineers to work together with your team to solve your problems. S.V. Techsol, prides itself in offering various design capabilities to meet your design requirements and standards.

S.V. Techsol can provide a number of different services:

  • Evaluation of a problem
  • Propose design solution to alleviate a problem or produce higher yield
  • Design product or update current product design with new solution
  • Prototype product development
  • Manufacture and assembly
  • Modification to existing products to allow for better efficiency & cost savings

S.V. Techsol meets and follows protocols from SEMI (Semiconductor Equipment and Materials Institute) standards S11-126 and F21-95 and ISO, USA Federal 209 Class Standards, and/or Pharmaceutical cleanroom classification.

  • S11-1296 – Environmental, Safety and Health Guidelines for Semiconductor Manufacturing Equipment Minienvironments.
  • F21-95 – Classification of Airborne Molecular Contaminant Levels in Clean Environments

Table: Selected airborne particulate cleanliness for cleanrooms and clean zones.

ISO Class Maximum Number of Particles in Air
(particles in each cubic meter equal to or greater than the specified size) Particles ⁄ m³
Particle size
> 0.1 µm > 0.2 µm > 0.3 µm > 0.5 µm > 1 µm > 5 µm
ISO Class 1 10 2
ISO Class 2 100 24 10 4
ISO Class 3 1000 237 102 35 8
ISO Class 4 10,000 2,370 1,020 352 83
ISO Class 5 100,000 23,700 10,200 3,520 832 29
ISO Class 6 1,000,000 237,000 102,000 35,200 8,320 293
ISO Class 7 352,000 83,200 2930
ISO Class 8 3,520,000 832,000 29,300
ISO Class 9 35,200,000 8,320,000 293,000



  • ISO-14644-1 Classification of Air Cleanliness
  • ISO-14644-2 Cleanroom Testing for Compliance
  • ISO-14644-3 Methods for Evaluating & Measuring Cleanrooms & Associated Controlled Environment
  • ISO-14644-4 Cleanroom Design & Construction
  • ISO-14644-5 Cleanroom Operations
  • ISO-14644-6 Terms, Definitions & Units
  • ISO-14644-7 Enhanced Clean Devices
  • ISO-14644-8 Molecular Contamination
  • ISO-14698-1 Biocontamination: Control General Principles
  • ISO-14698-2 Biocontamination: Evaluation & Interpretation of Data
  • ISO-14698-3 Biocontamination: Methodology for Measuring Efficiency of Cleaning Inert Surfaces
Maximum Number of Particles




USA Federal Standard 209 Class

The first Federal Standard 209 was published in 1963 in the USA, and titled "Cleanroom and Work Station Requirements, Controlled Environments". It was revised in 1966 (209A), 1973 (B), 1987 (C), 1988 (D) and 1992 (E), and withdrawn in 2001. The cleanroom class limits, given in the earlier 209 A to D versions, are shown in table 1. The class of a cleanroom is found by measuring the number of particles 0.5 m in one cubic foot of room air, and determining which class limit is not exceeded; this is the cleanroom classification.

Table: Federal Sandard 209 class limits

Based on feet³
Class Particles on feet³
>=0.1µm >=0.2µm >=0.3µm >=0.5µm >=5.0µm
1 35 7.5 3 1 N⁄A
10 350 75 30 10 N⁄A
100 N⁄A 750 300 100 N⁄A
1,000 N ⁄ A N⁄A N⁄A 1,000 7
10,000 N⁄A N⁄A N⁄A 10,000 70
100,000 N⁄A N⁄A N⁄A 100,000 700