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ASTM C1338 Test

Determines Fungi Resistance of Insulation Materials and Facings

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ASTM C1338 : 2019 Standard Test Method for Determining Fungi Resistance of Insulation Materials and Facings

ASTM C1338 test is used to determine the resistance of insulation materials and facings against fungal growth.

Fungi quickly begin to thrive on insulation material and facings under moist and humid environments. ASTM C1338 test helps to determine the quality and effectiveness of newly manufactured insulation products under favorable lab-controlled conditions to resist fungal growth.

Organisms typically used in this method: Aspergillus niger (ATCC-16888)

Test Process of ASTM C 1338

ASTM C1338 Test Method

  • Test samples are inoculated with fungal spores and incubated under conditions favorable for fungal growth for a time duration of 28 days. 
  • After incubation period, test samples are examined for visual fungal growth. 
  • To pass ASTM C1338, test sample should not show any fungal growth.
  • Customers can also send the comparative material for analyzing the performance of test samples against fungal growth.

At MIS, we have incorporated advanced testing & analytical technologies to perform antifungal efficacy protocols like ASTM C1338.

We are committed to offer rapid and reliable results through our performance testing services. Our team experts plan and carry out testing analysis using both analytical and scientific techniques. In addition, all our testing protocols are in line with international standards.

Looking for ASTM C1338 testing for your product samples! Contact our experts now to know  – test price, turnaround times, or any other related questions. 

We cater to clients and companies worldwide, helping to assess antibacterial, and antiviral efficacy of their products. We also offer a range of testing services in the field of chemistry and toxicology.


ASTM C1338 is a qualitative antifungal test to determine the efficacy of insulation materials and facings against fungal growth.

ASTM C1338 test is applicable to insulation materials and facings that are used on unfinished floors, ceilings, walls, and other new construction areas.

ASTM C1338 test takes 4-6 weeks to complete.

At Microbe Investigations, we test for  ASTM C1338 using Aspergillus niger (ATCC-16888). Additional strains can be added as per customer request.

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