# US 9,518,912 B2 · Permeability determination > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 9,518,912 B2 - Document ID: US9518912B2 - Status: Granted - Kind: B2 - Application number: 14/311,863 - Filed: 2014-06-23 - Published: 2014-12-25 - Granted: 2016-12-13 - Earliest claimed: 2013-06-24 - Assignees: Industrial Textiles & Plastics Ltd. - Applicants: Industrial Textiles & Plastics Ltd - Inventors: Richard R. Menage - Web page: https://patentgrep.com/patent/US9518912B2 ## CPC - G01N 15/0826: {and measuring fluid flow rate, i.e. permeation rate or pressure change} - A62B 17/00: Protective clothing affording protection against heat or harmful chemical agents or for use at high altitudes (protective clothing or garments for work or sport A41D13/00; {e.g. overalls A41D13/02, surgical gowns A41D13/12; materials for protecting clothing A41D31/04}; protecting eyes or ears A61F9/00; composition of materials for protective clothing A62D5/00; life-saving garments for use at sea B63C; diving suits B63C11/02; flight suits B64D10/00; space suits B64G6/00; bullet-proof clothing F41H1/02) - G01N 15/08: Investigating permeability, pore-volume, or surface area of porous materials - G01N: INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES (measuring or testing apparatus or processes other than immunoassay, involving enzymes or microorganisms C12M, C12Q) - A62B: DEVICES, APPARATUS OR METHODS FOR LIFE-SAVING (valves specially adapted for medical use A61M39/00; life-saving devices, apparatus or methods specially adapted for use in water B63C9/00; divers' equipment B63C11/00; specially adopted for use with aircraft, e.g. parachutes, ejector seats, {B64D17/00, B64D25/10}; rescue devices peculiar to mining E21F11/00) ## Abstract Apparatus and methods determine a permeation characteristic of a challenge chemical for a chemical protective material. A processor retrieves barrier characteristics of the chemical protective material for which the permeation characteristic is to be determined from a computer memory. Information regarding the challenge chemical is obtained. A temperature is received of the chemical protective material for which the permeation characteristic is to be determined. The permeation characteristic is determined from the temperature, the barrier characteristics, and the information regarding the challenge chemical. ## Claims ### Claim 1 A method for determining a time for a challenge chemical to cumulatively permeate through a chemical protective material to a toxicity limit, the method comprising: retrieving, with the processor, barrier characteristics of the chemical protective material from a computer memory; obtaining, with the processor, information regarding the challenge chemical, the information including a toxicity limit for the challenge chemical; receiving, at the processor, a temperature of the chemical protective material for which the time is to be determined; and using the temperature, the barrier characteristics, and the information regarding the challenge chemical, to determine a time for the cumulative permeation of the challenge chemical through the material to reach the toxicity limit at the received temperature. ### Claim 2 (depends on 1) The method according to claim 1, wherein determining the time for the cumulative permeation of the challenge chemical through the material to reach the toxicity limit comprises determining the permeation rate for the challenge chemical through the chemical protective material at the received temperature. ### Claim 3 (depends on 1) A computer implemented method according to claim 1, wherein the receiving of the temperature of the material is manually input by a user. ### Claim 4 (depends on 1) A computer implemented method according to claim 1, wherein the receiving of the temperature of the material comprises determining of the temperature by one or more temperature sensors. ### Claim 5 (depends on 1) The method according to claim 1, wherein the method is implemented outside of a laboratory environment laboratory environment. ### Claim 6 (depends on 1) The method according to claim 1, wherein the chemical protective material is a homogenous or multi-layer film, membrane, laminate, coated fabric or fabric. ### Claim 7 (depends on 1) The method according, to claim 1, wherein the chemical protective material is a chemical protective garment or suit. ### Claim 8 (depends on 1) The method according to claim 1, further comprising receiving a selection of a percentage area of the chemical protective material subject to contamination by the challenge chemical. ### Claim 9 (depends on 1) The method according to claim 1, further comprising operating a display to present the determined time for the cumulative permeation of the challenge chemical through the material to reach the toxicity limit at the receiving temperature. ### Claim 10 (depends on 1) The method according to claim 1, wherein the time for the challenge chemical to cumulatively permeate through the chemical protective material to the toxicity limit is calculated based on a predetermined skin toxicity of a challenge chemical. ### Claim 11 (depends on 1) The method according to claim 1, wherein the method further includes providing a timer, wherein the timer will sound an alarm once the permeation time determined by the method is approached and/or reached and/or exceeded. ### Claim 12 An apparatus for determining a time for a challenge chemical to cumulatively permeate through a chemical protective material to a toxicity limit, the apparatus comprising: a memory comprising barrier characteristics for a plurality of chemical protective materials; an input interface that receives a selection of the chemical protective material from the plurality of chemical protective materials; a microprocessor communicatively connected to the memory and the input interface, the microprocessor configured to: retrieve at least one barrier characteristic of the chemical protective material from the memory; obtain information regarding a challenge chemical, the information including a toxicity limit for the challenge chemical; obtains a temperature of the chemical protective material for which the time is to be determined; and determine the time for the cumulative permeation of the challenge chemical through the material to reach the toxicity limit at the selected temperature using the temperature, the barrier characteristics, and the information regarding the challenge chemical; and a display operable by the microprocessor to the present the determined time. ### Claim 13 (depends on 12) The apparatus of claim 12, further comprising a temperature sensor communicatively connected to the microprocessor wherein the microprocessor obtains the temperature of the chemical protective material from the temperature sensor. ### Claim 14 (depends on 12) The apparatus of claim 12 further comprising a chemical detector communicatively connected to the microprocessor wherein the microprocessor obtains the information regarding the challenge chemical based upon an indication received from the chemical detector. ### Claim 15 A non-transient computer readable medium programmed with computer readable codes that upon execution by a microprocessor, causes the microprocessor to: retrieve at least one characteristic of a chemical protective material from a computer memory; obtain information regarding a challenge chemical, the information including a toxicity limit for the challenge chemical; receive a temperature of the chemical protective material at which the time is to be determined; and use the temperature, the at least one characteristic, and the information regarding the challenge chemical, to determine a time for the cumulative permeation of the challenge chemical through the material to reach the toxicity limit at the receiving temperature. ### Claim 16 (depends on 15) The non-transient computer readable medium of claim 15, wherein determining the time for the cumulative permeation of the challenge chemical through the material to reach the toxicity limit comprises determining the permeation rate for the challenge chemical through the chemical protective material at the received temperature.