Test Criteria

Based on the ISO 10993 series of testing standards for biocompatibility (which are required for medical products in the EU), textiles used in the healthcare sector or products for sensitive groups (e.g. allergy sufferers) can also be tested for their biocompatibility.

Tests to exclude cell damage are required for the "medically tested" label.

Factsheet: BIOCOMPATIBILITY TESTING

Cell Culture Test:

Materials can release cell-damaging substances when used. These toxins are detected on the sample material by analyzing their effect on skin cells. The cytotoxicity test (DIN EN) ISO 10993-5 is the first of several biocompatibility tests in the (DIN EN) ISO 10993 series of standards that we conduct.

For this test, an extract of the sample material is prepared and cultivated with L 929 skin cells in different concentrations over several days. The vitality of the cells or the potential cell-damaging effect of the test material is quantified in comparison to control cultures.

Required: the substances released from the sample have no cell-toxic effect. The quality label is issued based on a test report with detailed results.

Cell Culture Test:

This cell culture test uses immune cells to detect the allergy potential of substances that may be released from the sample material when used. The sensitization test is a general screening test for the detection of an allergenic effect. The technical prerequisite for the sensitization test is passing the cytotoxicity test.

For this test, an extract of the sample material is prepared and incubated with immune cells for 48 hours. Sensitizing substances stimulate the cells to form surface markers to which specific fluorescence-labeled antibodies are bound. In the flow cytometer, the percentage of positive cells is determined by the fluorescence intensity.

Required: no sensitization potential is detected by the sample. The quality label is issued based on a test report with detailed results.

HET-CAM Test:

The irritating effect of materials is quantified on the basis of changes to the mucous membrane of a chicken egg. The test assesses the hazard potential for skin irritation. The HET-CAM according to DB-ALM Method Summary n° 96 is a recognized alternative to the animal test on the rabbit eye (Draize test).

For this test, an extract of the sample material is prepared and placed on the chorionallantoic membrane (CAM) of incubated chicken eggs for a few minutes. Certain textiles or creams/ointments/solutions can be applied directly to the CAM. The strength of three different types of reaction of the CAM (coagulation, haemorrhage and lysis of blood vessels) is determined according to the endpoint method.

Required: no highly irritating substances are released from the test material (test result: "not irritating to slightly irritating, score ≤ 10). The quality label is issued based on a test report with detailed results.

Testing for Harmful Substances:

Required: Proof of safety from harmful substances with a valid STANDARD 100 by OEKO-TEX® certificate or by obtaining a STANDARD 100 by OEKO-TEX® certificate.

Hohenstein Laboratories are accredited by DAkkS.

Contact
Ben Mead
Managing Director
Hohenstein Institute America