Safety Data Sheets

Product Data Sheets

ANSI/FM 4950 Approved

Backed by the American national standards institute and FM Approvals

Hi Temp is proud to have the following products approved as welding curtains:

Welding Curtain: O51, P51 & G51

As Defined by FM APPROVAL 4950

Hot work, if not properly managed, can lead to damaging fires. FM Approved welding blankets, curtains and pads are designed by their manufacturers to be heat-resistant fabrics designed to be used when combustible materials cannot be moved a safe distance away from hot work operations. In order to be effective, the welding blanket, curtain or pad must completely cover the combustible surfaces to be protected.

    • A welding curtain is intended for use in vertical applications with light to moderate exposures such as that resulting from chipping, grinding, heat treating, sand blasting and light horizontal welding.

The performance of welding curtains may be drastically reduced if they exhibit any of the following characteristics:

  • Attached slag
  • Discoloration
  • Frayed material
  • Holes of any size
  • Rips and/or tears

Products which exhibit any of the above characteristics should be replaced immediately.

Hi Temp complies with FM Approvals routine audits of our manufacturing process.

FM approvals also have their own independent testing to determine what qualifies as an FM approved material. This is outlined in three main tests.

1. Fire and Thermal Test: A controlled torch cutting of three-quarter-inch thick steel plate in close proximity to either a horizontally placed fabric specimen (pad or blanket candidate, as defined below) backed by thermocouples and a sheet of paper or a vertically placed fabric (curtain candidates) to contain sparks and slag.

2. Charring and Embrittlement: After enduring fire and thermal testing, horizontally placed materials are bent over a 1-inch pipe and are pulled at right angles in two directions, then inspected for cracking or other openings in the fabric.

3. Weatherization: Materials are then subjected to 1,000 hours (about 42 days) of simulated outdoor conditions such as rain, dew and sunlight.

CAN/ULC-S109 (NFPA 701) Approved

What is the CAN/ULC-S109 (NFPA 701) Test?

Fabrics used in most public spaces (including schools, churches, auditoriums, theatres, and more.) is required by law in many states and cities to be certified as flame retardant, according to standards developed by the National Fire Protection Association (NFPA). NFPA has various standards depending on how the fabric will be used. In the case of draperies, curtains, and similar hanging textiles, the standard that applies is NFPA 701: Standard Methods of Fire Tests for Flame Propagation of Textiles and Films. This test measures the flammability of a fabric when it is exposed to specific sources of ignition.

NFPA 701 (Small Scale) testing measures the ignition resistance of a fabric after it is exposed to a flame for 12 seconds. The flame, char length, and flaming residue are recorded.

The fabric will pass the test if all samples meet the following criteria:

An after flame of less than 2.0 seconds
A char length of less than 6.5”
The specimen does not continue to flame after reaching the floor of the test chamber
Fabric certified as flame retardant is certified to have been tested and passed the NFPA 701 test.

CAN/CSA-M427-M91 Approved:

Fire-performance and antistatic requirements for ventilation materials

Hi Temp’s materials have all passed the CAN/CSA-M427-M91 standard as independently tested by the Canadian Explosives Research Laboratory.

CSA Standard CAN/CSA-M42 7, Fire-Performance and Antistatic Requirements for Ventilation Materials. Was developed because a fire-resistance test for ventilation ducts has become necessary in order to permit evaluation of ducts and thus prevent fire spread. A fire in an underground mine can be very dangerous because of limited means of escape.

Ventilation tubing and brattice cloth are often made of polymeric materials that have the potential to spread to a fire once ignited.

This standard outlines the test methods necessary to ensure the safe use of ventilation tubing materials by determining their flammability and antistatic requirements for underground mines.



This Standard specifies the fire-performance and antistatic requirements for new (unused) ventilation materials for use in underground mines.


Ventilation materials can be divided into two categories: rigid tubing and flexible sheeting. (The latter can be either used in the form of hanging sheets or made into tubing.) The physical differences between these two categories require that the tests and requirements be slightly different. The intent of this standard, however, is to ensure that the fire-performance and antistatic characteristics are evaluated in an equivalent manner.


This Standard covers ventilation material of the following types:

(a) Type VH-AS, intended for either vertical or horizontal applications in explosive atmospheres;

(b) Type VH, intended for either vertical or horizontal applications in nonexplosive atmospheres;

(c) Type H-AS, intended for horizontal or near-horizontal applications in explosive atmospheres;

(d) Type H, intended for horizontal or near-horizontal applications in nonexplosive atmospheres.

The CSA Group is a global provider of testing, inspection and certification services for products from a wide range of market sectors, and a leader in safety and environmental certification for Canada and the US. As one of the largest standards development organizations in North America, The CSA Group understand the recognized benchmark that a standard sets – a benchmark that products can be tested and certified to.

The CSA Group is accredited or recognized by numerous organizations, including the U.S. Occupational Safety and Health Administration, the American National Standards Institute, and the Standards Council of Canada. This CSA certification gives organizations confidence that their products, and their business, are future-ready.

Underwriters Laboratory UL 1709

A quick over view of the UL 1709 test is that it is measuring the ability of Hi Temp’s material to protect the integrity of a steel beam to a fully exposed rapidly heat rising fire over a 2 hour time period. Hi Temp is proud to say that we have met the standards of the UL 1709 test as independently tested by Intertek laboratories. UL 1709 looks to be a huge requirement in the future for major oil and gas refineries as they look to adopt this as the standard for welding blankets of the future. Below is a more detailed outline of the scope of the UL 1709 test.

Scope of the UL 1709 Test

1.1 This standard describes a test method for measuring the resistance of protective materials to rapid-temperature-rise fires.

1.2 The test method covers a full-scale fire exposure, intended to evaluate the thermal resistance of protective material applied to structural members and the ability of the protective material to withstand the fire exposure.

1.3 The standard describes the minimum testing requirements for classification, the limits of applicability of test results and acceptable methodology to determine the classification achieved.

1.4 The test method includes a supplementary test method for beams, intended to evaluate the ability of protective materials to perform when subject to significant deflections, for use in conjunction with the full-scale exposure test and applicable for beams and other sections subject to bending. Information published in accordance with this test method may also include product design tables for beams and sections subject to bending derived from the supplementary test method and accompanying methodology.

1.5 Information published in accordance with this test method may also include supplementary product design tables for alternate limiting temperatures derived from a multi-temperature analysis. Such tables are provided to aide in conditions where a performance-based-design approach is implemented, but are not part of the classification.

Hi Temp’s Materials Comply with CAL/OSHA 4848 Standards

Hi Temp’s materials have been approved to meet the following standard as set by the Californian Occupational Health and Safety Board

(a) The employer shall establish a fire prevention and suppression procedure whenever any of the operations and processes covered by Sections 4794(a) and 4850(a) are conducted on its property. The employer shall issue and implement instructions on fire prevention and suppression procedures based upon the requirements contained in American National Standards Institute (ANSI/ASC) Z49.1-94, Safety In Welding, Cutting and Allied Processes, Chapters 3 and 6, and National Fire Protection Association (NFPA) 51B-19992009, Standard for Fire Prevention During Welding, Cutting, and Other Hot Work, Chapters 3-7, which are hereby incorporated by reference.

(b) Welding blankets, curtains and pads shall be approved for their intended use in accordance with Section 3206 of these Orders.