NTST 04/04/17
Nevada Thermal Spray Technologies (NTST)
NTST website: www.nevadathermalspray.com
Contact: Dominic, 702-449-2154,
NTST FIRE PREVENTION (FP) COATINGS
1.0 Executive Summary:
NTST has developed coating systems to mitigate the hazard of fire for any underlying material. These coating systems meet testing standards for temperature and moisture exposure. They are the most economical product in the marketplace and can be marketed as a green fire protective coating solution. Table 1 summarizes the testing on the NTST FP coating systems.
Table 1. NTST FP TestingNTST FP system / Successful Burn Test / Successful Freeze Test / SuccessfulWater Test / Successful Water Test/Burn Test
XS1 (wood, WS) / Yes: B1 B2 / Yes: F1 / NC: WS / NC: WS
XS1S (XS1 sealed, wood) / Yes: B1 / Yes: F1 / Yes: W1 / Yes: W1/B1
XP1 (wood, WI) / Yes: B1 / Yes: F1 / Yes: W1 / Yes: W1/B1
YS1 (metal, WS) / Yes: B1 / Yes: F1 / NC: WS / NC: WS
OXS1 (OSB, WS) / Yes: B1 B3 / Yes: F1 / NC: WS / NC: WS
OXS1S (OXS1 sealed, OSB) / Yes: B3 / Yes: F1 / Yes: W1 / Yes: W1/B3
OXP1 (OSB, WI) / Yes: B1 / Yes: F1 / Yes: W1 / Yes: W1/B4
NOTE: B1: successful 15 minute burn test at 1710F, B2: successful 20 minute burn test at 1710F, B3: successful 15 minute burn test at 1465F, B4: successful 12 minute burn test at 1465F, F1: successful 24 hour freeze test, NC: not conducted, W1: successful 24 hour water immersion test, OSB: oriented strand board, WI: water insoluble coating system, WS: water soluble coating system.
2.0 NTST FP Coatings
NTST has developed non-intumescent, ceramic based coating systems that are able to be used for any underlying substrate material (e.g. wood, OSB (oriented strand board), metal, etc.) to mitigate the hazard of fire. NTST has extensive experience in thermal barrier coatings, ablative materials, and heat management systems currently used in many different industries. The NTST FP coating systems meet durability standards for exposure testing to moisture and temperature differentials. The FP coating systems are cost competitive with other code approved methods, are friendly to the environment, and have the potential of being marketed as a green fire protective coating solutions. The coating materials are inert, non-toxic, odorless, and can be washed down the sink.
3.0 NTST FP Coating Burn Testing
Experimentation on the FP coatings on various substrates involved using an oxy-propane torch in air which can reach temperatures as high as 3600 F. The coatings were tested for various times with the flame perpendicular to the substrate at various standoff distances. The temperature of the impinging plume is approximately 1710F at a 2.75” standoff distance and 1465F at a 4” standoff distance. These temperatures were verified in pre-testing using melting point measurements and during testing using a Rayteck Raynger 3i Series infrared temperature measurement device (temperature range -20 to 2200 F).
4.0 NTST FP Coating Burn Testing On Wood
Experiments on the FP coatings on wood used 2x4 substrates that were completely encapsulated with the FP materials. Testing was conducted using samples with and without prior water immersion testing (see Table 1). The testing protocol is defined in Section 3.0.
An uncoated wood sample ignited within 15 seconds at a 4” standoff distance, and was reduced to ash within 2 minutes. In every test for wood, the top and bottom substrate temperatures were measured. In all cases the Rayteck device indicated the bottom (flame impingement side) temperatures were in agreement with the aforementioned pre-testing temperatures. The maximum top temperatures ranged from 180F to 305F for all of the tests.
Sample XS1, which uses a water soluble binder, survived the B1 burn test (15 minutes at 1710F) without igniting the wood as illustrated in Figure 1.
Figure 1. NTST Coated Wood Test XS1
Sample XS1S (XS1 coating system sealed with a moisture sealer) survived the B1 burn testing as illustrated in Figure 2 for non-immersion water samples. Similar results were obtained with the samples that were first water tested. However, coating cracking was evident on both samples at the conclusion of the tests.
Figure 2. NTST Coated Wood Test XS1S
Coated sample XP1, which uses a water resistant binder in the coating formulation, also survived the B1 burn test without igniting the wood as illustrated in Figure 3 for the non-water immersion samples. The XP1 water immersion samples exhibited similar results.
Figure 3. NTST Coated Wood Test XP1
5.0 NTST FP Coating Burn Testing On OSB
Experiments on the FP coatings on OSB used 3/8” thick substrates which mimics the web of an I-joist. All samples were completely encapsulated with the FP material. Testing was conducted using samples with and without prior water immersion testing (see Table 1). The testing protocol is defined in Section 3.0. In every test for OSB, the top and bottom substrate temperatures were measured. In all cases the Rayteck device indicated the bottom (flame impingement side) temperatures were in agreement with the aforementioned pre-testing temperatures. The maximum top temperatures ranged from 360 to 475F for the tests.
Coated sample OXS1, which uses a water soluble binder, survived the B3 burn test (15 minutes at 1465F) without igniting the wood as illustrated in Figure 4 for the non-water immersion sample. At the end of the test, when accidentally dropped a piece of the coating delaminated from the matrix. Similar results were obtained with the samples that were first water immersion tested.
Figure 4. NTST Coated OSB Test OXS1
The OXS1 coating system when sealed with a moisture sealer (i.e. system OXS1S) also survived the B3 burn testing as illustrated in Figure 5 for both water immersion and non-water immersion samples.
Figure 5. NTST Coated OSB Test OXS1S (non-water immersion sample)
Sample OXP1, which uses a water resistant binder in the coating formulation, also survived the B1 burn test without igniting the wood as illustrated in Figure 6 for the non-water immersion samples. The XP1 water immersion samples exhibited similar results for the B4 test (12 minute test). Cracking was evident on both samples at the conclusion of the tests.
Figure 6. NTST Coated OSB Test OXP1 (non-water immersion sample)
6.0 NTST FP Coating Burn Testing On Metal
Experimentation on the FP coatings on steel substrates was conducted. All samples were completely encapsulated with the FP material. The NTST YS1 coating system is able to be used for metals in a fire situation. Unprotected metal structures can reach a critical temperature where the mechanical properties are degraded to the point where the material strength is compromised. The YS1 coatings cause less heat to be transferred to the metal by creating a thermal barrier. Coated sample YS1, illustrated in Figure 7, uses a water soluble binder. This sample survived the B1 burn test (15 minutes at 1710F) without debonding as illustrated in Figure 8.
Figure 7. NTST YS1 Coating on Steel
Figure 8. Testing of NTST Coating YS1 on Steel
7.0 NTST FP Coating Weathering Testing
Standard testing for accelerated weathering of FP coatings was conducted for both moisture and low temperature extremes for the FP coatings. In all cases for all testing, the coating formulations survived the low temperature testing which involved subjecting the samples to a freezing environment for 24 hours. No cracking or delamination was evident on any of the tested coatings as illustrated in Figure 9 for samples XS1 and XP1.
Figure 9. Testing of NTST Coatings XS1 and XP1 on Wood for Freezing Temperature
The water immersion testing involved submerging the coated wood samples for 24 hours. The XS1 coatings use a water soluble binder. This coating formulation was always intended to be sealed or painted once applied. In testing, the water soluble coatings degraded, resulting in a large loss of material from the samples. The XP1 and XS1S formulations were explicitly developed with a water resistant capability for the coating systems. These samples successfully survived the immersion testing as illustrated in Figure 10 for wood sample XP1.
Figure 10. Moisture Testing of NTST Coating XP1 on Wood