Substrate Database

 

Substrate Materials Sample Preparation

Substrate samples for records MRN 1 to 216 were prepared using a sample size of 6 cm2.  There are two records for each substrate: a unburned sample and a burned sample.  The burned sample was prepared following the modified destructive distillation method for 2 minutes (see method below). 

Substrate samples for records beginning with MRN 220 are prepared using a sample size of approximately 16 cm2 or 1.5 grams.  Each substrate is burned by a modified destructive distillation method (MDDM), a direct method (DH), and an indirect method (IH). The substrate samples are burned at three different time intervals for each burning method.  Including the unburned sample, each substrate consists of 10 samples/records.

 

Modified Destructive Distillation Method

Substrates are placed into an unlined quart metal paint can with the substrate surface most commonly adjacent to the heat source facing downward.  For example, a carpet sample is positioned so the tufted or woven textile side is in contact with the bottom of the can. Nine holes of approximately 1 cm in diameter are punched into the can lid and then placed on the can without sealing.  Heat is applied with a propane torch so the tip of the torch is 4 cm from the bottom of the can and the flame is centered.  Once smoke appears from the top of the can, the time interval begins.   A sample is prepared for each of three time intervals: 1, 2, or 5 minutes.  At the end of the time interval, the propane torch is removed.  The punctured lid is replaced with an intact lid and the can is cooled to room temperature.  

 

 

 

 

 

 

 

 

 

 

 

 

Direct Method

Substrates are placed onto an upside down can lid with the substrate surface most commonly adjacent to the heat source facing upward.  For example, a carpet sample is positioned so the tufted or woven textile side faces upward toward the propane torch. The torch flame is positioned at a 75-degree angle and 4 cm from the substrate sample.  The time interval begins immediately.  A sample is prepared for each of three time intervals: 1, 2, or 3 minutes.  At the end of the time interval, the propane torch is removed.  A can is placed over the sample, and then cooled to room temperature.

 

 

 

Indirect Method

Substrates are placed onto an upside down can lid, which is positioned on a ring stand with the substrate surface most commonly adjacent to the heat source facing downward.  For example, a carpet sample is positioned so the tufted or woven textile side is in contact with can lid. The torch flame is applied at a 75-degree angle underneath the lid.  The time interval begins once smoke appears.  At the end of the time interval, the propane torch is removed.  A can is placed over the sample, and then cooled to room temperature.

 

Interfering products from the heated and un-heated substrate materials are collected by passive headspace adsorption onto activated carbon following the ASTM E 1412 standard method. An activated carbon strip (10 mm x 22 mm) is suspended into the headspace of the can by a paperclip and un-waxed dental floss. The sealed can is heated for 16- 18 hours at 66ºC. Once cooled to room temperature,

MRN 1 - 216: the activated carbon strip is removed from the can, cut in half and placed into a vial with 1/2 ml of carbon disulfide for analysis.

MRN 220 - : the activated carbon strip is removed from the can and placed into a vial with 1/2 ml of carbon disulfide for analysis.